yachts with solar panels

Silent Yachts

Creators of the world’s first series produced, solar-powered electric yachts.

Unlimited Range

Noiseless cruising, zero emission, minimal maintenance, pioneering solar powered yachting since 2009.

The Original Solar Yacht

As the original inventors of series produced solar-electric yachts, we pioneered this innovative approach. Our first model, the Silent 64, was launched to the market in 2016, several years before any other shipyard considered the possibility of going electric.

Leading Technology

Our founders began to research alternative energy sources to power yachts during the mid 1990s. Today, the technology of our in-house developed solar-electric drivetrain has been perfected and is multiple generations ahead in terms of reliability, performance and efficiency.

Historical Track-Record

In 2009, the Solarwave 46 was launched as our first prototype of a fully solar-electric, self-sufficient ocean-going catamaran. Since then, our electric yachts have cruised many 10.000s of nautical miles, performing flawlessly during a variety of weather conditions.

Enabling Self-Sufficiency

What differentiates a Silent is the unprecedented level of autonomy provided by our yachts. Being able to produce your own energy enables a fully self-sufficient lifestyle on board. Travel the oceans sustainably while making them your infinite playground.

The award-winning entry to solar-electric yachts.

Timeless design meets state-of-the-art technology.

120 Explorer

The boldest expression of solar powered yachting yet.

What Makes Us Unique

The tranquility on board of our yachts is unique. A lack of noise, fumes and vibrations create a deep connection with the sea. Luxury and sustainability finally merged into a holistic experience, working hand in hand with nature by minimizing the impact on the marine environment without compromising comfort.

For optimal performance and efficiency, our solar-electric drivetrain integrates seamlessly with all onboard systems. Compared to fossil fuelled powertrains of motoryachts, electric powertrains have very few moving parts, resulting in minimal maintenance, maximum reliability and significantly lower running costs.

The ability to recharge your own batteries with the sun marks a new era of freedom. Depending on cruising speeds and weather conditions, a Silent has virtually unlimited range, enabling you to live a fully self-sufficient lifestyle on board. Unbound by the limitations of fossil fuels, you are free to explore the horizons.

The technology powering our yachts today has been pioneered by our founders almost three decades ago. Continuous upgrading and steady optimization of the entire system are some of the key reasons our in-house developed solar-electric drivetrain offers a comprehensive portfolio of assurances and warranties.

Powered by an advanced jet propulsion system, the fully electric Tender Series perfectly complements the experience on board of our catamarans. Following the same philosophy as our electric yachts, it was developed with a strong focus on being spacious, lightweight and efficient.

As a new breed of Silent, the Speed 28 combines futuristic design with blistering pace. Her high-performance drivetrain is supported by triple foils and embedded solar cells on the hardtop. Advanced hydrodynamics and latest AI management make for a stable ride which always remains comfortable.

Why Silent Yachts

A sensible approach to yachting which works in self-sufficient harmony with nature and creates a completely new experience on board.

New Silent Drivetrain

Tech shorts 2023

Electric power event on the water

Shipyard tour Italy by Michael & Heike

What is the range of a solar electric yacht?

Where are Silent yachts built?

“The Tesla of the seas! An amazing founding couple, a highly innovative product as well as a really cool story behind it. Furthermore, a lot of love and attention has been invested into every single detail – truly impressive!” Frank Thelen / TV Personality, Founder, Angel Investor & Disruption Expert

While the present has brought us the dawn of smart cars, I strongly believe the future will bring us solar powered smart boats – and I definitely want to be at the frontline of that journey. Michael Jost / Former Head of Group Strategy of Volkswagen Group

The idea of sailing while charging your own battery is super powerful to me – solar powered sailing is the perfect love story! Jochen Rudat / Former Tesla Central Europa Director, Advisory Board Silent Group

Elon Musk single handedly forced an entire industry to go electric, as a matter of fact if they don’t all go electric now they will soon die. I would like to see the same thing happening for boating. You are not just selling boats – you are the actual leading edge of a crucial and much overdue revolution to sustainable transport!” Klaus Obermeyer / Emmy Award Winner

I am completely excited about solar catamarans. I knew before they are great but now I truly believe this is the future. After so many boats I’ve seen in over 18 years with Boote Exclusiv, this yacht truly blew my mind. Such a silent and peaceful cruising experience – just the way it should be. Martin Hager / Editor in Chief for Boote Exclusiv - Yachts

Recommended water toys, accessories and products to enhance every Silent voyage:

The ZEN50 is a game changer. World’s first series production catamaran equipped with a wingsail, it defines a new distinctive class of its own, where genuine zero-emission meets high comfort and performance, limitlessly. 

Designed from scratch for ZEN Yachts by award-winning naval architect Julien Mélot , this full carbon catamaran is the ultimate essence of technology driven, high performance and luxurious, eco-friendly leisure yachting. 

The blue water capable ZEN50 lightweight racing carbon hulls are combined with a huge solar roof for an unrivaled solar power vs. displacement ratio above 1:1 (18 kW / 17 tonnes), making this yacht completely energy self-sufficient. A revolutionary, fully automated, wingsail - by Ayro© - can be added as a range and speed extender. The yacht’s high capacity battery bank powers a powerful silent electric propulsion, allowing the ZEN50 to achieve 14 knots and maintain high continuous speeds in unrivaled safety and comfort, indefinitely… 

The ZEN50 is offered with or without wingsail and comes in 3 main different versions: Racer, Cruiser and Explorer, each dedicated to a different usage and owner profile. We use these versions as a basis to define a final, bespoke specification for each of our valued clients and ZEN Community Members. Scroll down for more details, specifications and prices.

1st WINGSAIL series production yacht in the world!

The OceanWings32 - by Ayro© - was initially developed for Team Oracle, for the America’s Cup 2010 in Valencia. Over years, it has further been developed and automated by VPLP and was installed on Energy Observer in 2019. Two years of field feedback have allowed the Ayro team to fine tune the algorithm commanding the wingsail. The ZEN50 is the first series production leisure craft to be equipped with this fully automated wingsail. It is controlled at the touch of a finger on screens, is automatically adjusted and has several safety modes and features. The two parts of the wingsail can be hoisted and lowered independently and with the simple touch of a button. The wingsail OceanWings32 is the ideal complement for the solar roof for those wishing to cruise long distances off-shore with zero-emissions.

Greatest ratio SOLAR POWER / weight on the market

At 17 tonnes lightweight and 18,000 W of peak solar power, the ratio of the ZEN50 is at over 1 kW per displaced tonne of water or beyond 1:1 which is far beyond any other blue water CE Cat A yacht in this size range. Lots of solar power for little water to displace is the strong and healthy foundation the energy self-sufficient ZEN50 is built upon.

Performance CARBON sandwich hulls

The hulls of the ZEN50 have been designed from a blank screen for ultimate efficiency - understand minimum drag or minimal energy consumption for a range of speeds from 6 to 10 knots. Their shape is aggressive, sharp and slender. Their reverse bows cut through water like a sword cuts through butter and their curvature is reminiscent of graceful dolphin bodies. These hulls are undoubtedly of the performance type and are built with the best available composites: Carbon fibre and Corecell™. The combination of high strength, low weight and performance design allow the ZEN50 to reach speeds of up to 14 knots.

INFINITE range at high CONTINUOUS speeds

With maximized solar and wind power and minimized energy consumption… the ZEN50 can sail continuously at speeds varying between 6 and 10 knots. Thorough simulations in various sea states and weather system have consistently shown the ZEN50 will be able to achieve performance catamaran speeds continuously without using a genset. With the ZEN50, the world is your oyster and the wildest destinations are within your reach with this self-reliant vessel!

True ZERO-EMISSION operation

The first ZEN50 unit, whose construction started in March 2023, will not be equipped with a genset at all and will not have any fossil fuels onboard. The ZEN50 energy system with its very large capacity 160 kWh battery bank, has been designed to function for days in complete safety with minimal solar energy harvest and no wind. It is perfectly safe with no backup genset and operates 24/7 without any polluting emissions.

NO FUEL , no costs

Naturally, requiring no fuel to operate day in day out is great news for the environment, it is also fantastic news when sailing into remote areas where fuel bunkering might be near impossible or where the fuel quality might be an issue. Finally, it also makes a massive difference in this yacht’s costs of operation. Imagine the hundreds of liters of diesel saved over just a week, the obsolete engine maintenance schedules, the clogged filters and dirty tanks from another age… Welcome to a new burden-free, energy self-sufficient era, welcome to clean and graceful eco-yachting, welcome to ZEN Yachts.

Highest SAFETY & reliability

At ZEN Yachts, we have made some design choices to attain energy self-reliance with the ZEN50 that reduces the habitable volume in the hulls, similar to performance catamarans. Where we have not and will never compromise is on safety. Our main voltage system is 48V making it perfectly safe to work on. The level of redundancy of the batteries and solar panels is 10! The main electrical architecture is split in 2 so that should anything happen on 1 hull, the entire vessel can still operate normally. There are 2 independent helm stations and the ZEN50 is packed with special safety features, nonsubmersible compartments and we can even offer an in-depth practical course on safety equipment usage and management. Sailing with the ZEN50 is not only exhilarating and clean, it is ultra safe!

Unrivaled space & COMFORT

The ZEN50 offers the speeds of a performance catamaran, the comfort of a large motor yacht and the simplicity of an electric car. No less than 2 large day beds, 3 dining areas for over 10 people, 1 professional galley and 2 wet kitchens, 5 heads, up to 4 double ensuite cabins, 1 bunk double and 1 single together with both saloon and dining areas converting into extra sleeping areas, this is simply unrivaled on a 50 ft. catamaran. Add an electric tender, dive compressor, satellite internet, 2 helm stations (cockpit and flybridge), a solar roof that converts into a gigantic upper deck to enjoy the most epic sunrises and sunsets, welcome onboard the ZEN50!

SPECIFICATIONS

Main particulars.

• Length Over All: 15.7m

• Beam: 8.4m

• Depth Molded: 2.7m at midship

• Displacement (light) : 17 T

• Draft (design): 1.3m (4.3ft) incl. keel

• Passenger Capacity: 12

• Berths: 12 (4 x double + 2 x single + saloon)

• Building Material: Carbon Fiber - Corecell™ composite

• Certification: CE Cat A - Unrestricted with 12 persons

Note: Some of the above figures may vary between versions

PROPULSION & ENERGY

• Propulsion: 2 x 50 kW brushless DC motors

• Main Battery Pack Capacity: 160 kWh Lithium

• Solar Roof Peak Power: 18 kWp

• Wingsail: Oceanwings® OWS 3.2 by Ayro©

• Backup Battery Pack Capacity (Nav/Com/Wing): 5 kWh Lithium

• Main System Voltage: 48V - Low voltage for total human safety

• Accommodation Voltage: 110V or 220V

SPEED & RANGE

• Max. Speed on e-motor only: 10 kn

• Max. Speed on e-motor & Wingsail: 14 kn

• Cruising Speed for continuous operation - solar only: 4.5 - 5 kn

• Cruising Speed for continuous operation - solar and wing: 6 - 10 kn

• Cruising Speed day time: 8 - 10 kn

• Range Over 24 h: 180+ nm

Note: These values may vary between versions and sea / weather conditions

EQUIPMENT INCLUDED - RACER VERSION

• Integrated power management system

• Solar power & energy storage system

• Electric propulsion system

• By-wire steering system

• Helm stations at cockpit & flybridge

• Galley counters, storage, sink, oven, stove, fridge, freezer

• 4 en suite heads with enclosed shower, toilet, sink & faucet (in each head)

• All cabin furniture (as shown in layouts)

• Aft deck fixed dining table and aft sofa with collapsible back rest (as shown in layouts)

• Fore deck day bed and lateral seats (as shown in layouts)

• Outdoor marine cork decking / indoor saloon natural bamboo decking

• All cushions In/Outdoor upholstered with Sunbrella® fabric

• 6 deck hatches

• 2 x 500 liter (2 x 132 gal) fresh water tanks

• 2 x 100 liter approx. (2 x 26 gal) fresh water tanks + 1 fresh water pump

• 2 x 350+ liter approx. (2 x 92 gal) holding tanks

• Railings, cleats and fore deck trampolines

• Mooring equipment: 33 kg Rocna® stainless steel anchor + 50 m stainless steel chain 10 mm + 150 m nylon rope + e-windlass

• Regulatory navigation equipment including navigation lights & mast

• 2 x chart plotter 16”; 2 x VHF with DSC button

• Regulatory Life Saving Appliances

• Critical spare parts kit

Note: The above equipment is for the Racer version. Cruiser & Explorer versions carry additional equipment

ZEN50 Solar Wingsail Electric Catamaran - Solar Roof Layout

ZEN50 Solar Wingsail Electric Catamaran - Flybridge Layout

ZEN50 Solar Wingsail Electric Catamaran - Main Deck Layout - Asymmetric D (subject to changes)

ZEN50 Solar Wingsail Electric Catamaran - Cabin Layout - Asymmetric D (subject to changes)

ZEN50 Solar Wingsail Electric Catamaran - Cabin Layout - Asymmetric E (subject to changes)

SOLAR & WINGSAIL

OCEAN RACER

Solar power & Wing, basic configuration, navigation, safety, fridge, etc.

EUR 2 150 000

WORLD CRUISER

Solar power & Wing, well equipped with A/C and water maker

EUR 2 400 000

ARCTIC EXPLORER

Solar power & Wing ultimate configuration with all available options

EUR 2 650 000

Solar power, basic configuration, navigation, safety, fridge, etc.

EUR 1 700 000

CONTINENTAL CRUISER

Solar power, well equipped configuration with A/C and water maker

EUR 1 900 000

TROPICAL EXPLORER

Solar power ultimate configuration with all available options

EUR 2 100 000

Ready to reserve your ZEN50?

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SUNREEF 60 ECO SURREAL SOLAR POWER BREAKTHROUGH

Surreal is a recently launched Sunreef 60 sail catamaran combining the shipyard’s expertise in luxury catamaran design with the latest Sunreef Yachts Eco  green tech solutions. 

The new  Sunreef 60 Eco Surreal, is the first 60 foot catamaran that was equipped with in-house developed composite-integrated solar panels built into the yacht’s hull sides, superstructure and bimini roof, maximizing solar power generation and offering unrivalled energy efficiency for long, vibration and fume-free navigation as well as for the appliances on board.

With a thickness below 1mm, the ultralight solar skin is the industry’s lightest and most efficient solar power solution.

Thanks to their advanced integration technique,  Sunreef Yachts Eco  solar panels have a very high resistance to shock and abrasion. The catamaran was also fitted with a powerful custom-engineered battery bank.

The luxury sail yacht welcomes up to eight guests thanks to a smart and spacious 4-cabin layout. With a fully-equipped galley placed down in the starboard hull, the catamaran’s saloon offers generous lounging and dining areas. The custom designed interior and furniture are both contemporary and timeless.

The catamaran’s alfresco relaxation spaces include a large flybridge with a wet bar, a sunken lounging area on the foredeck and a full-beam aft cockpit with a big swim platform.

The flybridge on board Surreal welcomes guests to an immense lounge with a bar and a large c-shaped settee.   

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Solar Express: The 130m concept with 1,500sqm of solar panels

Related articles.

Design studio M51 has unveiled a 130 metre superyacht concept that is covered in over 1,500 square metres of solar panels.

Aptly named Solar Express, the concept’s exterior is characterised by the huge “narwhal-tusk” inspired spike at its bow.

Anthony Glasson, the designer behind the concept, said: “Taking inspiration from steam trains, Solar Express is an attempt at a greener future for large superyachts.”

The concept’s foredeck, sundeck and stern are covered in solar panels which combine with storage batteries and generators to power the yacht’s onboard electrical systems.

Solar Express’s lightweight aluminium hull, combined with lightweight materials throughout the vessel, reduce the weight and allow for greater battery capacity. A hybrid propulsion system comprising twin Azipods and electric generators also helps keep emissions down.

According to Glasson, the concept’s 5,260GT is a relatively small volume for a 130 metre yacht, resulting in more room for solar panels and smaller interior areas to keep air-conditioned.

In order to pen the eco-focused concept, Glasson admits some sacrifices were made during the design process. “This concept is for the owner who does not mind forgoing some typical large superyacht features such as helipads or sundecks to make way for solar panelling.”

Solar Express nonetheless still offers a range of typical luxury yacht amenities including a 10 metre long swimming pool, a hot tub and al fresco dining on the main deck.

Accommodation is found on the upper deck, with two VIP cabins overlooking the aft deck and provided with expansive ocean views.

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This yacht sets sail with solar

The 60 square meters of solar panels produces 30-50 kWh of energy per day, enough to power all of the onboard electronic equipment for around seven hours.

• Commercial & Industrial PV

Solar-powered Baltic yacht.

Image: Solbian Solar

Baltic Yachts began delivery in July of its Baltic 146 Path, which includes an 8,714 watt solar rooftop and energy storage system designed by Solbian Solar using the company’s walkable solar modules.

Recently, some of the yacht’s technical work has been shared online. Built from 1,742 monocrystalline solar cells, many of the 86 solar panels were custom cut to fit the deck’s shape by the Solibian team in Italy. The units were based on the company’s Super Rugged (SR) Series .

The SR series has solar cell busbar technology developed by Merlin Solar. In one video, the Merlin team drives over the solar panel, throws bags of cement on it, and even shoots it with a bow and arrow in an effort to prove the product’s resilience. The company said its busbar technology makes this kind of abuse possible.

The 60 square meters of solar panels produces 30-50 kWh of energy per day. The company said that’s enough to power all of the onboard electronic equipment–including navigation, autopilot, lighting, and entertainment–for around seven hours.

Once the sun goes down, a Mastervolt MLI 44kWh LiFePO4 battery pack allows the diesel generator mostly to stay off, providing generally silent operation for 14-18 hours.

Baltic Yacht’s solar system is roughly half the size of the Silent 60’s 16.8 kWdc solar plus storage system. The Silent 60 is a solar-propelled yacht less than half the lengthBaltic yacht and price, which reaches 6-8 knots on solar power alone. The Path does not feature electric propulsion and therefore relies on diesel engines when the wind dies down.

Since the Path uses a sail for propulsion, the team installed 154 bypass diodes and 12 solar panel strings and trackers – Mastervolt SCM-60 MPPTS – in an effort to maximize power output and minimize the effect of the sail’s shadows on the panels. The entire solar system, including wiring, controllers and small parts, weighs less than 300kg, the company said

The 146 Path has an overall length of 146 feet. The yacht can accommodate eight in addition to the ship’s owner, as well as eight crew members. Path carries two tenders, an 8hp Torqeedo electric outboard-powered RIB, and a 6.5m twin-engined RibEye. There are also two ultra-lightweight Reverso Match sailing dinghies.

When the front tender is deployed, its storage container can be turned into a pool.

The ship’s main diesel engine is a 405kW (550hp), six-cylinder Scania. The specific model isn’t listed, however the “ DI13 092M IMO Tier III, EU Stage IIIA ” lines up with all of the stats and looks like the unit in a video of the engine being installed.

The owner’s suite includes a sleeping cabin, and an en suite lounge with a glass divider doubling as a movie, tv, and sailing information screen. An upper lounge features a 2.7m-long video wall.

This content is protected by copyright and may not be reused. If you want to cooperate with us and would like to reuse some of our content, please contact: editors@pv-magazine.com .

John Fitzgerald Weaver

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Sandia offers public access to csp archives, related content, elsewhere on pv magazine....

Since it is E propulsion all they have to do to change while sailing is use the motor in regen it’ll generate power back into the pack at much larger amounts. And a small RE fueled generator just in case. As a sailor who does solar, not a chance it’ll get that much from the solar from all the shading from the rigging. More likely 10-30kwh/day. On mine, I made the sails small with 2 masts so I can lower them to not shade the panels.

Any photos of your boat you can share?

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Solar-Powered Yachts Are Taking Over. Here’s Why That’s a Good Thing.

Diesel-powered engines are getting some healthy competition., michael verdon, michael verdon's most recent stories, this new 262-foot superyacht lets you mix and match 3 interior and exterior designs.

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In 2005, Michael Köhler turned away from the diesel engines that had been powering his boats for 23 years and went instead with solar power, an idea that seemed laughable, given the technology’s limitations at the time. But after five years of testing and development, Köhler’s Solarwave 46 became the world’s first solar-powered yacht.

Since then, his Silent Yachts brand has become larger and ever-more luxurious, running bow-to-bow with traditional motoryachts. The new 80-foot tri-deck has a spacious salon and six staterooms, six-and-a-half-foot ceilings and unlimited cruising potential, since the lithium-ion batteries powering the 250 kw electric motors recharge on the go (and for free) courtesy of the yacht’s 1,227 square feet of solar panels. And the benefits extend beyond minimal emissions and engine vibration. “We have more living space than competitors,” Köhler says, “since electric motors require less space than diesel engines.”

Very different vessels are using electric propulsion to minimize noise and lower emissions, like Super Air’s Nautique GS22E.  Super Air

The solar niche is small but growing, with new entrants like Serenity Yachts and the BYD Group. These power yachts have cruising speeds of 8 knots and top speeds of up to 20 knots, though they’ll burn through battery packs quickly at that rate. Therein lies the design dilemma of battery-powered boats: Do builders prioritize range or velocity?

Correct Craft ’s new GS22E wakesurf boat found a way to twist battery limitations to its advantage. “We’ve designed the most energy-dense battery system for where a combustion engine typically goes,” says Sean Marrero, president of Watershed Innovation, which developed the GS22E’s Ingenity electric propulsion system. Tailored for hour-long sessions, owners can wakesurf in the morning, then recharge the battery so it’s ready after work. “It doesn’t run like a Tesla,” says Marrero, “but rather it mirrors the wakesurf experience with its stern dug into the water—minus the noise and emissions.” Other builders are rumored to have electric towboats in the works.

Feadship ‘s 273-foot Savannah.  Feadship

In the superyacht segment, Feadship director Henk de Vries would like to see every new yacht leaving his Dutch yard equipped with hybrid propulsion by 2025. De Vries is so serious about this mission that Feadship will absorb the extra cost over conventional propulsion, currently amounting to several million dollars, of those electric drives. So far, two boats have chosen hybrid power: the 273-foot Savannah , launched in 2015, and Feadship’s largest build, the 361-foot Anna, delivered two years ago. A third yacht launched that same year, the 287-foot Lonian , is also “heavily hybrid,” de Vries says.

“When we built Savannah , a hybrid with the [battery] equivalent of many Teslas in the engine room, we also invented the classification rules for these yachts,” says de Vries. “Even though the project was successful, the superyacht world was slow to adapt. I want to get to the point where one owner says to another, ‘Oh, your boat still burns fossil fuel?’ That will help create the mindset.”

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Solar Powered Yachts

Solar panels are a fundamental element of today’s quest for responsible energy generation. Used in households, commercial facilities, and power stations across the globe, they are also a vital source of energy for solar powered yachts. With significant progress made over the last years, photovoltaic technology has emerged as the natural energy source with the most exciting growth potential.

Thanks to photovoltaic cells, solar panels absorb sun radiation to generate direct current (DC). When sunlight reaches a solar cell, it causes silicon electrons to move. This motion will start the flow of electricity that is captured by wires and directed to an inverter. Inverter technology is then used to convert it to alternating current (AC) ready to power household appliances.

The solar power systems on solar powered yachts usually consist of solar panels, batteries, charge controllers and inverters. While batteries store the energy obtained from the solar panels, charge controllers prevent batteries from overcharging. Solar catamarans with house appliances on board will usually need to convert the DC energy into AC with the help of an inverter.

Sunreef Yachts produces solar panels in-house and uses a new (patent-pending) technology to integrate them within structural components. The panels are made of the industry’s most efficient cells with a peak performance of 24%.

Thanks to the solar cells’ outstanding flexibility, Sunreef Yachts’ solar panels can be mounted on any surface of the solar powered yacht. As a result, they are integrated with various areas on board, such as hull sides, mast, superstructure, bimini roof or bow terrace to maximize energy generation.

With a thickness below 1mm and weighing around 1,8 kg per square meter (average solar panels will weigh between 8 and 15 kg per square meter), they are one of the lightest solar power systems in the world. In addition, tests have proven that thanks to their advanced integration technique, Sunreef Yachts solar panels have a very high resistance to shock and abrasion. This allows them to be used on any surface, including hull sides.

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With dedication and passion for high tech, sustainability and excellent design, Soel Yachts creates solar electric yachts that promise high efficiency, low emissions, outstanding comfort, low maintenance, and significantly reduced costs of ownership. We are driven by an unwavering commitment to accelerate the transition to sustainable and autonomous mobility on the water.

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Our solar electric catamarans combine all the elements for a luxurious and environmentally conscious aquatic lifestyle. With zero CO2 or noise emissions on board, you can reconnect with your senses and fully enjoy the journey.

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The Soel Yachts portfolio offers solar electric catamarans for both private and commercial applications. With the vast experience gathered trough different projects worldwide and boats successfully performing on a daily basis for many years, we gladly can discuss individual requirements and find the ideal solution for your preferred electric yacht and destination

PIONEERS SINCE 2007

Bringing over 15 years of extensive expertise in electrifying solar electric yachts since 2007, we have been pioneers in the solar yachts industry. Our integral solar electric systems in-house have impressively powered more than 27 circumnavigations of the Earth across the world’s oceans, offering unmatched real-world testing and performance validation for an extraordinary and worry-free sailing experience.

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At our core, we strive for the perfect balance between cutting-edge technology, purposeful design, and outstanding performance. Our innovative approach combines streamlined hull designs for electric propulsion, engineered in conjunction with our in-house systems, to ensure an exceptional range.

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Silent yachts are the industry leader in ocean-going production yachts that are completely solar sustainable and powered by solar energy. seaworthy, luxurious, and built to impeccable standards, silent yachts are already desirable without its solar capabilities. with the abundance of solar panels on board each boat, every silent yachts model is able to cruise for 100 nautical miles in complete silence. even while at anchor, the solar-powered generators keep the yacht powered quietly for an unprecedented boating experience. enjoy all the benefits of a power catamaran with the addition of solar energy. silent yachts.

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Silent Yachts offer an environmentally conscious choice when it comes to owning a yacht. Silent Yachts currently offers three solar-powered power catamaran models including the Silent 55, Silent 64, and Silent 80. United Yacht Sales is proud to be the U.S. distributor for Silent Yachts and can assist you in your search for the world's first solar-powered yacht. For more information, please contact United Yacht broker Darren Sell at (561) 351-7333 or by email at [email protected] . 

Where are Silent Yachts built?

Silent Yachts are built through two different shipyards depending on the model. The Silent 55 is built at the world-class shipyard of Mazarin German Yachts which also has a production site located in China. For over 70 years, Mazarin has been a leader in quality yacht construction with over 400 yachts delivered. Mazarin are experts in innovative construction processes that are able to produce light weight yachts.

The Silent 64 and Silent 80 are produced at the Italian-based shipyard Consorzio Navale which is a prestigous consoritum of builders and sub-contractors in the industry. The group has serviced many of the major Italian yacht brands such as Ferretti Yachts and Riva Yachts . Additionally, the Silent Yachts 80 features styling and design by Marco Casali and naval architecture by Insenaval.

Are Silent Yachts really completely solar-powered?

The short answer is yes. Owners can choose to go 100% solar-powered or install diesel engines should higher speeds want to be achieved over longer distances. Silent Yachts can cruise up to 100 miles per day by power acquired through its solar panels. Every day the solar panels are able to generate more power than the total consumption needed for propulsion at cruising speeds plus powering all of the appliances on board. 

How does the solar power work? 

The Silent Yachts power system feeds the electric propulsion of the power cat and all of the energy it needs to run the A/C, refrigerators, and other household appliances. Light-weight lithium batteries provide an ample amount of energy for everything on board. The lithium batteries used in Silent Yachts are the most expensive ones on the market, but also the most reliable, safe, and have the longest life span.

Solar panels are integrated to the roof of the flybridge hardtop sections instead of just being bolted on top, resulting in no wind load or resistance againest them. Below is a video explaining how the system functions and operates back when Silent Yachts were originally called "Solar Wave":

Who is the team behind Silent Yachts?

Heike and Michael Kohler have sent almost their entire lives on a boat. After more than two decades of using various boats, cruisers, and sailboats on multiple oceans, they became dedicated to finding a better energy source for the propulsion of yachts. Between the years of 2005 and 2009, Heike and Michael tested a number of a multitude of various alternative energy sources. In 2009, SolarWave 46 was launched as a proof of concept for their design. While there are many boats and yachts built that use solar power in some fashion, the Solarwave 46 was the first ocean-going yacht to use solar energy to power everything on board from engines to appliances.

What else is different about how Silent Yachts are built?

Certainly the solar-powered engines and generators are the distinguishing characteristic, but there are a lot of other features that make each Silent Yacht unique. For example, the molds were created using a CNC-milling machine that is able to contruct particular shapes for an optimized design. The materials used in the hull include a carbon compositie that is then resin-infused for a light-weight, but very strong platform. Every hull is fully insulated and the long-term durability is exceptional thanks to the high-quality resin used in the infusion process.

What propulsion systems are recommended by Silent Yachts?

Silent Yachts recommends the 2 x 135 engines as the best solution. If the owner is making frequest trips from Point A to B (Say Miami to the Bahamas for example) the faster hybrid is recommended. The main differentiator here is cruising speed. If the owner is living on the yacht for an extended period of time, rarely pushes the engines to top speeds, and stays below 12 knots, then the E-Power is recommended.

When the generator is running, does the 100Kw go to charging the batteries (which run the 250 Kw e-Motors) or directly to the e-Motors?

All of the enery consumers and producers are connected to the bus bar. If there happens to be more power produced than consumed, the excess power goes to re-charge the batteries. If for some reason more power is required than what is produced, the needed power comes from the lithium batteries.

What is the sustained speed if both 100 Kw generators are running?

This answer really depends upon sea condition and the weight of the boat (for example components, additional equipment, water toys, etc.). The sustained speed on average though is between 12 and 14 knots, 10 knots with one generator running. It is possible to cruise at 10 knots without a generator running when using the Solar E-Power.

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Solar Learning Center > Solar Panels for Home > Solar Panel Installation Process > Solar Panels For Boats and Yachts Solar Learning Center > Solar Panels for Home > Solar Panel Installation Process > Solar Panels For Boats and Yachts -->

Solar Panels For Boats and Yachts

By Michael Olenick | Jul 26, 2022

The purchase of a boat or a yacht is a coveted purchase for many people. While it certainly adds a new dynamic to one’s life, it’s not the most straightforward investment since maintenance is a huge component of owning a sea vessel. Other than the physical maintenance of your boat, fuel management and maintenance is often a logistical nightmare for many boat owners. Some of these problems include keeping batteries topped off; doing it quietly, as not to bother the surrounding communities; and refueling costs. An easy solution to these problems: solar panels.

Sizing a Solar System for Your Boat or Yacht

• Refrigerator(s)
• Radar & sonar units

When adding up your energy consumption, always round up and add about 10-15% extra Watt-hours to your total, as certain appliances tend to use up more energy during spring and summer months. Once you reach the conclusion that you are ready for a further discussion, you can always reach out to a solar panel expert to get solar quotes, help with your energy calculations, and aid in determining the right number of panels you would need to offset your yacht or boat’s energy usage. Obviously, the number of panels you would need depends on energy usage and vessel size, but solar is a much better option than common fossil fuels when powering your boat.

The Benefits of Adding Solar Panels To a Boat or Yacht

When it comes to adding solar panels to your boat, the benefits are endless. Here are just a few for you to consider:

• Silence: Noisy refueling at docks and extremely loud on-board generators are a thing of the past. Cruise the seas in with zero mechanical noises, and enjoy the natural ocean sounds.
• Minimal Maintenance: The only maintenance solar panels require is a simple rinse off every couple of months, as salt can build up when the seawater evaporates.

• Travel Lightly: With your new panels, you won’t have to lug heavy containers of fuel with you on your trips. More room for wine or martini mix.
• Unlimited Energy: Aside from the occasional cloud in the sky, you will have full access to the sun on the open seas.

Besides the affordability and convenience, solar panels could inevitably save your life. You will never have to worry about running out of fuel when you are out on the water. This will help you avoid any potential emergencies or disasters.

Solar Panel Placement

This is where most caution needs to be taken. When choosing where you are going to place your solar panels on your yacht or boat, you need to take two big things into consideration: shading and security.

When it comes to shading, you want to make sure you place your panels in an area that receives the most sunlight. Having your boom shade some of the panels, or any lines can reduce your energy production. The wiring of solar panels can also be delicate. That is why you need to place your solar system in the most secure spot possible – rough seas or choppy waters could lead to a wire shaking loose.

If you’re longing to make a maintenance upgrade to your nautical vessel, a solar system should be seriously considered. Not only will it reduce noise, weight, and fueling costs, but it will differentiate your boat from all the other vessels at your next port.

Whether you have questions about panel placement, efficiency, or just if your boat is right for solar, please click here to speak to an expert!

Solar Panel Installation Process

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Sustainability Success

10 SOLAR Boats 2023 & 2024 | Electric Yachts & Catamarans

With more steps being taken towards sustainable development, new, eco-friendly solar boats have been introduced in the world of green travel: solar electric catamarans. 

Solar boats are electric yachts that can go for long distances without needing to stop for fuel and without emissions. Those solar catamarans are interesting eco-friendly alternatives to the classic power boat or sailing yacht for cruising. However, there are also a few disadvantages that you should know about before purchasing one!

Table Of Contents

10 Solar boats, electric yachts & catamarans

Here are the best solar boats that will delight you with a top-notch sustainable yachting experience based on your requirements:

Sunreef Yachts – Eco 80 Sail Catamaran

• Silent Yachts – Silent 80 3-Deck

HH Catamarans – HH44

Silent yachts – silent 60, sunreef 43m eco (140 ft).

• Silent 120 Explorer
• 100 Sunreef Power Eco

Azura Marine – Aquanima 40

Soel yachts – soel senses 48, serenity yachts – serenity 64 (hybrid).

Here’s a quick summary of the features of the best solar catamarans for green yachting in 2023-2024:

If you are an advocate of sustainable yachting or sustainable tourism and are looking to buy an eco-friendly boat that doesn’t rely on fossil fuels , then you would do well to consider getting a solar catamaran. In this article, I will go through the pros and cons of 10 of the best solar yachts and superyachts that you can buy in 2023 and 2024!

It is also important to note that while there are solar panels for sailboats that you can fit on older models, those new boats have been specifically designed to maximize the use of renewable energy.

Most Luxurious + Most innovative solar system

The Eco 80 Sail Catamaran is one of the electric solar boats provided by Sunreef Yachts.

It features a unique “solar skin” that covers all composite structures on the boat, including hull sides, boom, mast, bimini, and superstructure. This green tech makes it possible to place solar panels where it wouldn’t normally be possible (like the hull and any other smaller but useful surface) and provide enough solar energy from every angle.

The boat is 80-feet long (24.38 meters) and includes electric motors that push it smoothly over the water without causing any vibrations or noise.

Besides being solar powered boat, the Eco 80 Sail Catamaran can also be powered by wind and hydropower. It is designed with a sail on its structure, allowing it to tap into wind power and supplement the solar.

The solar powered sailboat generates enough green power not only to propel the boat and keep it moving but also to charge the essential electric water appliances and other water-sport toys.

So far, the Sunreef Yachts Eco solar sailboats have earned a good reputation for being eco-friendly and sustainable. Besides, this solar powered catamaran takes its commitment to the environment a notch higher by using recycled materials , natural fibers, and non-toxic paints to create their boats.

It is no wonder that Sunreef Yachts have been winning environmental awards for so many years. This solar sailboat is one of the most remarkable boats you can ever invest in and it clearly shows the latest advancements in technology .

Prices: about $8 million USD

Where to buy : Sunreef Yachts .

• Larger surface covered with solar panels, that are installed also along the hull, and in other unusual areas.
• The batteries are 30% lighter than normal
• Unlimited cruising range.
• It runs silently and does not cause pollution.
• It has also traditional sails, so it can cruise also when it is not sunny without relying on batteries.
• Luxury, superb quality and finishing
• Great helm position.
• The solar catamaran is very costly (going for $8 million USD or more).
• The solar panels installed on the sides of the catamaran may not be appealing to the eye of all people.

Silent Yachts – Silent 80 Tri-Deck Solar Catamaran

Best pure electric

The Silent 80 Tri-Deck Solar yacht is popular for the large amount of space it offers.

This solar catamaran by Silent Yachts features three large decks that can be easily customized to fit the owner’s preferences and needs. The topmost deck can either be open or enclosed.

This solar powered yacht offers 4 to 6 cabins that are customizable, regardless of whether the deck remains open or enclosed. Besides, the top deck provides additional living space and can be used as a luxury master suite that opens onto a private space outdoors.

Where to buy : Silent Yachts .

• Purely electric propulsion that can be helped by the kite sail.
• The finishing, while being of high standards, doesn’t seem to be at the level of other options in its category.
• Quite costly, with prices starting at about $6 million USD.
• If going for a long cruise during cloudy days you may need to run the generator to keep going.
• The kite sail helps to give some propulsion using wind, but it is less effective than traditional sails.
• The absence of a traditional sail may make the boat a bit less stable, compromising a bit of the comfort while cruising.

Best for world cruising

HH Catamarans is a small boutique boat builder designing some of the most impressive solar boats for cruising, with one of their latest creations being the HH44.

The HH44 is a groundbreaking new boat that is designed to be eco-friendly and efficient.

The boat has a large battery bank that can be charged by solar panels, and also has two electric motors that can be used for electric propulsion up to 7 knots for up to 2h.

The HH44 has an innovative propulsion system named Eco-Drive. This is a parallel hybrid system that combines diesel and electric propulsion for long-range motoring and silent electric propulsion.

The boat also has two diesel engines, which can be used for long-range motoring or to generate electricity. The boat is also designed to be safe, with four propulsion devices plus sails and a large solar array.

The HH44 has a number of technical features that make it a groundbreaking eco-friendly design, including:

• 3 types of propulsion: full electric, standard diesel, and sail.
• 4.2 kWh of solar panels: generating power for recharging the lithium battery bank for solar .
• 10 kW electric motors (5kW each): mounted on the back end of each diesel engine for electric propulsion.
• The diesel engines can be used both for propulsion and as electric generators.
• Possibility to use the propellers to recharge the battery while the boat is sailing. Kind of like using hydropower to charge your solar batteries , pretty cool!

The HH44 is also a performance catamaran thanks to its C-shaped §daggerboards. Daggerboards are an essential component of many sailing vessels, providing both vertical lift and increased upwind sailing performance.

This solar powered yacht features up to 4 double cabins and 2 heads . Not bad for this world-cruising vessel!

If instead, you are looking for a larger boat, HH Catamarans also have other models up to 88ft.

This solar catamaran was also the preferred choice of Gone with the Wynns , a popular cruising YouTube channel. Here’s their announcement video:

Where to buy : HH Catamarans .

• A true performance world cruiser.
• Very resilient with 3 different propulsion modes (electric, sail, and conventional engines) and ideal for offshore cruising.
• It can run silently and without causing pollution.
• More affordable than other solar catamarans, starting from $1 mm USD
• Smaller than other options.
• The improved sailing performance requires narrower hulls, which reduces the available space onboard compared to other traditional vessels of similar size

Best mid-range

The Silent 60 is one of the smaller electric boats made by Silent Yachts. It is designed to be handled by at least two people. The users can either choose to include an additional crew or not.

Despite its outward small appearance, Silent 60 is very spacious and can accommodate a good number of people.

Besides, the electric yacht has a beautiful design that adds to its elegant and luxurious feel. It is usually designed with up to 6 cabins , with each cabin offering every basic amenity you need to have a luxurious stay on the yacht. In fact, the electric solar boat is equipped with everything you need to allow you to live on board permanently!

As someone who loves spending time on the water, I was really excited to learn about the Sunreef 43M Eco: a superyacht that is both eco-friendly and luxurious.

I was especially impressed by the solar power system, which is built into the composite structures of the yacht, and the large hydraulic platform which creates a vast walkaround beach club.

The interior of the solar superyacht is just as impressive as the exterior, with a variety of sustainably-sourced materials and fabrics used throughout as well as energy-saving air-conditioning. The Sunreef 43M Eco can welcome up to 12 guests in the most luxurious conditions.

Silent Yachts – Silent 120 Explorer

Here’s another incredible solar super-yacht by Silent Yachts. The Silent 120 Explorer is a truly unique yacht, designed to explore the world in style and comfort.

Powered by solar energy, this solar catamaran is perfect for those who want to enjoy the beauty of the open seas without worrying about the impact on the environment.

With plenty of space for guests and all the amenities you need onboard, the Silent 120 Explorer is the perfect choice for your next adventure. If you’re looking for a yacht that combines luxury and environmental responsibility, the Silent 120 Explorer is a perfect choice.

The company didn’t yet release detailed information, however, this superyacht seems to be even featuring a helipad under the roof’s solar panels!

The Silent 120 Explorer has plenty of room for guests and all the amenities you need onboard. So if you’re ready to embark on your next great adventure, be sure to consider the Silent 120 Explorer, which will likely start being delivered in 2023.

The 100 Sunreef Power Eco

Sunreef recently launched and sold their first 100 Sunreef Power Eco catamaran, a transatlantic luxury craft that takes solar boat design to the next level.

With massive living space, great autonomy, and impressive features like a flybridge that can be transformed into an outdoor cinema, the 100 Sunreef Power Eco is the perfect vessel for cruising in supreme luxury

This catamaran uses the latest innovations in solar power to achieve outstanding energy efficiency, and its ultralight battery bank provides for silent cruising and infinite range.

The fully customizable interior and exterior make this catamaran a truly one-of-a-kind option, and its use of ethically-sourced and eco-responsible materials is sure to please even the most discerning buyer.

If you’re looking for an electric yacht that is both luxurious and eco-friendly, the 100 Sunreef Power Eco is certainly a great option for you if you can afford it!

The most affordable $

The Aquanima 40 catamaran is entirely powered by solar energy. It features creative adaptations and unique innovations that make it eco-friendlier and more economical boat than other solar-powered catamarans. For example, the solar panels installed on the electric catamaran are built in such a way that they can sell any excess solar energy back to shore stations when connected.

The exterior of the Aquanima 40 has an elegant design. Also, the interior is not only aesthetically pleasing, but also very clean and modern.

The boat is designed with 2 single cabins for the crew and 2 double cabins for guests.

Indeed, this solar boat by Azura Marine is one of the most economical and cost-effective options you can go for when buying a solar catamaran.

• Relatively fast.
• Ideal for short vacations.
• The most affordable solar catamaran, starting at about $0.6 million USD.
• Much smaller than other options.
• Not recommended for long cruises.
• Basic looks and layout.

As its name suggests, the Soel Senses 48 is 48 feet long. It has a slender design and is lightweight , making it more economical than most other solar-powered boats.

The boat is designed with two sleeping berths that can accommodate two people each. It also includes a salon that can offer enough sleeping space for four people. 

Compared with most other solar yachts, the Soel Senses 48 has a much smaller size. Its size, adding to its sleek and innovative design, give it faster speed than other solar-powered boats.

It incorporates 12 solar panels installed on the roof ; all these panels generate a combined electrical power of up to 2.7 kWh. The electricity generated by the solar panels is then stored in two batteries which can be easily configured to hold a maximum solar power of 142 kWh.

Like other Soel Yachts, the Soel Senses 48 glides smoothly over water without causing any noise, rattles, or generating fumes.

It has average cruising speeds of 10 knots, even reaching top speeds of up to 18 knots. However, the solar catamaran cannot run at its top speed for long periods.

Both the interior and the exterior of the Soel Senses 48 have a sleek and modern design. Every single component of the solar catamaran has been designed carefully to make it as functional and comfortable as possible. Therefore, when you board on this boat, you can expect to experience one of the best sailing experiences of your life.

The Serenity 64 Yacht features a diesel engine. It is a hybrid solar boat, which means that it can run on either solar power or on diesel.

The diesel engine especially comes in handy when the users wish to achieve faster cruising.

The solar catamaran is a very spacious electric boat and provides plenty of living space. It is built with four luxurious cabins, with each cabin having its ensuite bathroom. And even though the Serenity 64 is smaller than the Serenity 74 model also built by Serenity, it still provided an elegant feel and a smooth sailing experience.

Solar Boats Pros and Cons

The sun is a powerful and free source of energy, making solar power an attractive option for those looking to power their yacht. Solar panels can be used to generate electricity to run the yacht’s lights, appliances, and even the engine. Solar power can also be used to heat water for showers and laundry. But, what are the pros and cons of solar catamarans?

Here’s a quick summary of the solar yachts’ advantages and disadvantages:

One of the main benefits of solar power is that it is renewable and environmentally friendly. Solar panels have no emissions and do not produce pollution. In principle, they also do not require fuel, making them very cost-effective in the long run. Solar power is also very reliable, as the sun is a constant source of energy.

There are a few disadvantages to solar power. Solar panels can be expensive to install, and while they require less maintenance, this can be quite costly, especially when it will come time to replace the batteries. Solar panels also need to be pointing directly at the sun to be effective, so they may not generate power on cloudy days or at night.

But there’s more, let’s see what some sailing experts are thinking about solar catamarans!

Sailing expert’s solar Boat review

Recently, one of the most popular sailing YouTube channels, Saliling La Vagabonde , published a very honest and interesting review of the solar powered yacht Silent 55. Here’s a summary of their experience:

• 7 Days onboard (6 nights)
• Travelled 145nm with an average speed of 7 knots
• Generator used for about 12h (in total)
• Fuel consumed: 208 liters

Here are some interesting observations they made:

• While cruising it may feel less stable than a standard sailing boat because it doesn’t have a sail to stabilize it when hitting the waves.
• For the Silent 55 it was possible to move at about 3 knots by using only the power generated by the solar panels (without using the batteries) on a sunny day. This means that if you are moving the solar yacht around quite frequently, you will end up using the generator quite a lot to produce the necessary power.
• When the batteries are out of power, the Silent yacht is using a (diesel) generator to supply the necessary power to keep the boat moving and to power the appliances.
• A great luxury yacht with all the comforts and going in the right direction for the future of the sector.
• Overall, the Silent Yacht is a great eco-friendly alternative to a power boat , while if you are thinking about cruising around the world, you would be probably better off going for a standard sailboat (or for some of the hybrid alternatives mentioned in this article, like the HH44).

Why are solar yachts all catamarans?

Solar yachts are all catamarans for 2 main reasons:

• Catamarans have a larger surface, which allows for placing more solar panels and also offers more room for the batteries onboard.
• Catamarans have efficient hulls for their size. This reduces their power consumption while moving.

This makes catamarans the ideal platform to build a solar-powered boat.

Modern solar electric boats are undoubtedly an eco-friendly choice in sea travel and a form of green tourism . Not only do these electric boats provide a smooth sailing experience, but they also reduce the release of emissions into the atmosphere, reducing the environmental impact and enhancing sustainability .

Luckily, given their size, solar catamarans can charge themselves (unlike electric cars ), so they can sail indefinitely without the need to stop for refueling.

If you are environmentally conscious and looking to get a boat that is more viable, desirable, and eco-friendly, you may consider investing in one of the solar yachts discussed in this article!

Suggested Articles

Yachting Monthly

• Digital edition

Best Solar panels for off-grid power and keeping batteries charged

• Phil Sampson
• November 28, 2022

We take a look at 6 of the best solar panels for boats, from folding units to cutting-edge flexible panels

Free power forever? If only it was that simple! Photo: Graham Snook

For many in the boating community, solar panels represent something of a holy grail. They are, after all, the gift that keeps on giving, aren’t they? Free power forever, (or many years anyway), coupled with zero running costs – what could possibly be better than that?

All you have to do to make this dream come true is banish the memory of the purchase price from your mind – something boaters are notoriously adept at doing – and wait for the sun to shine. If only it were that simple…

The fact of the matter is that there are costs associated with solar panels beyond the price of the panels themselves. While some types of panels can be simply laid on the deck, in many cases some form of mount will be required.

Then there’s the wiring to hook them up to your battery, plus any fitment and/or cosmetic work needed to hide the cabling from view. If your panels are to be left connected permanently, you’ll require a regulator too.

This will prevent both overcharging and a reverse flow of power out of the battery after dark. If you do not fit a regulator, a blocking diode can be used to halt the reverse flow instead.

But once all of the above have been overcome – and providing you’ve done your homework to ensure your panels will generate sufficient power to cover your needs – then, yes, it’s a power free for all!

There are many other benefits to boat solar panels too: First and foremost, they work all on their own – solar panels are automatic, so you can just let them get on with the job.

Apart from the occasional wipe over and a wiring check, they’re largely maintenance-free too. Unlike wind generators, (especially like the one with wonky bearings on that boat moored next to you), they don’t make any noise.

And finally, your batteries will be pleased, because keeping them from going flat can extend their life.

Here’s our choice of the best boat solar panels.

6 of the best boat solar panels available right now

Giosolar 1,000W flexible solar panel

Best flexible boat solar panel

Delivering a mighty kilowatt of power, (not far off the amount used by a one bedroom house), this Giostar package comprises ten separate 100W panels, each of which is 1,050 x 540 x 2.5mm in size.

Capable of charging either 12 or 24V batteries, a kit of this magnitude is one for the most serious of solar enthusiasts – Eco Experts reckons 660-990W is sufficient for a liveaboard.

Giostar panels are abrasion resistant, anti-rust and dust proof and their junction boxes are sealed and waterproof. The panels are also light, thin and flexible, and can withstand being bent up to 30 degrees.

Reasons to buy: Incredible amount of power, panels are abrasion resistant as well as anti rust + dust proof

Reasons to avoid: Premium price

Price: £1,464.45

Buy it now on Amazon (UK)

Note: We may earn a commission when you buy through links on our site, at no extra cost to you. This doesn’t affect our editorial independence.

Ecoflow 160w portable solar panel.

Mobisolar 100W foldable solar panel

Best foldable boat solar panel

Mobisolar’s foldable panels are light (4.5kg) and measure 121 x 56.5 x 3 cm when unfolded, with the longest dimension reducing to 60 cm when folded, making them easy to transport.

The panels use advanced technology to provide superior performance, with each panel subjected to a thorough testing routine before and after assembly.

So confident is Mobisolar in its products that the company stands behind its panels with a two-year defect warranty and a five years’ electrical performance warranty.

For maximum flexibility in operation, three USB power outputs are fitted per panel, one delivering 100W, the second 60W and the third 10W.

Reasons to buy: Foldable, lightweight and long warranty

Reasons to avoid: Not resistant to the elements, doesn’t feature mounting holes

Price: £145.00

Buy it now on eBay

Eco-worthy 100W solar panel kit

With 100W panels being ideal for keeping batteries topped up, our second offering in this power class is from Eco-worthy, a major player in the solar panel field.

Competitively priced, our link below is for a kit which includes an LCD control unit and four ‘Z’ brackets in addition to the panel itself.

The Eco-worthy 100W panel is of the monocrystalline type, which means their cells are made from an ingot grown from a single silicon crystal of high purity. It’s also a rigid panel, so this particular product would need to be mounted on a frame or flat surface.

Reasons to buy: Competitively priced, Features LCD panel, brackets

Reasons to avoid: Only a year warranty, not resistant to elements

Price: £113.99

PV Logic 20W Flexi solar panel

Offered by Force 4 Chandlery, this lightweight semi-flexible solar panel comes complete with a dual battery solar charge controller.

The panel is completely waterproof thanks to its six-layer, heavy-duty laminate finish, and should a wayward crew member plod over it in their size 9s the panel’s dimpled top surface is ‘self healing’.

The controller can handle both 12 and 24V systems and the panel’s PWM (Pulse Width Modulation) charging system is efficient and battery-lifetime friendly.

Supplied with LED battery-status indicators and 4 metres of cable, PV Logic Flexi panels can be bonded to flat or curved surfaces.

Reasons to buy: Lightweight, waterproof, dual controller

Reasons to avoid: Lacks mounting options

Price: £149.95

Buy it now on Force 4 Chandlery

Powoxi 10W solar panel

At the budget end of the market comes this Powoxi 10W solar panel charger kit. While you won’t go far on just 10W of power, this kit claims to be capable of charging and maintaining various 12V batteries.

The kit features a fully automatic charging and maintenance controller, which provides intelligent three-level charging and protection against short- and open-circuits, under voltage and overloading.

A reverse flow system is included and the interface is described as ‘plug and play’. While the panel is rainproof, it will not withstand immersion in water, so this is a product to perhaps leave behind on the dock when you take to the water.

Reasons to buy: Great budget option, plug and play

Reasons to avoid: Not waterproof, won’t go far on 10V

Price: £27.59

Eco-worthy 10W/5W solar panel

The least pricey option we could find anywhere, this baby 5W solar panel is simply a trickle charger. But if that’s all you need then look no further, for this is another Eco-worthy product.

The technology in the panel is polycrystalline, so it’s not the most efficient on the market, but for this power that’s hardly a great concern.

The panel is supplied with two charging options; a pair of crocodile clips which attach directly to the battery, and a cigarette lighter plug.

According to the product’s eBay listing, this seller alone has sold approaching 3,000 of these units – and at this price, we can understand why!

Reasons to buy: Incredible price, can be charged via car lighter plug

Reasons to avoid: Small, not very efficient

Price: £9.99

6 Awesome Solar Boats for Eco Sailing in 2024 (Guide)

Liza pivoted from environmental consulting and doing impact assessments to writing about her two most counter-intuitive but passionate interests: sustainability and the importance of living an eco-conscious life; and marketing, martech, and AI. When she’s not writing, you can find her living a zero-waste-adjacent life in South Africa, falling down research rabbit holes on the internet, or out hiking with her dogs.

Introduction

Liza Shuttleworth pivoted from a career in environmental impact assessment and consulting to becoming a full-time writer, focusing on her most passionate (and diverse) interests: ecological conservation, sustainability, waste management and marketing, mar-tech, and AI.

Her professional portfolio reflects a diverse array of writing and consultancy roles spanning environmental science, marketing, and technology.

She has written for prestigious online and print publications on topics that include sustainability, climate change advocacy, waste management, and marine conservation, as well as marketing strategy, mar-tech, and the proliferation of AI tools for marketing.

Liza has an extensive professional background, having held management and consultancy positions within the environmental science, waste management, technology, and marketing sectors.

Her writing and editorial positions for both print and online publications have shaped content in ways that educate and inspire readers about sustainable living, climate change, and the power of innovative technology to overcome challenges in any setting.

Liza's academic background is rooted in a Bachelor of Social Science, focusing on Media and English. Beyond this, she has pursued tertiary qualifications in geography, psychology, and marketing, further enriching her knowledge base and contributing to her multi-faceted approach to writing and advocacy.

Solar boats are becoming a hugely popular choice for eco-friendly sailing. They’re quiet, can sail great distances without needing to stop for fuel, produce no carbon emissions, and do not rely on fossil fuels.

The popularity of solar-powered boats represents an evolution in marine transportation in favor of renewable energy and sustainability. Solar-powered boats provide a window into a future where clean, emission-free transport is not only possible but also preferred, due to developments in solar technology and design.

Solar boats are the ultimate of innovation and environmental responsibility, whether they are being used for peaceful journeys along beautiful canals or for bold ocean expeditions.

We reduce our dependency on scarce fossil fuels and lessen the ecological effect of traditional boating techniques by using the sun’s power to move us over the sea. Solar boats have the potential to completely transform the maritime sector and open the door to a more environmentally conscious and sustainable future for all, especially as the demand for eco-friendly alternatives keeps rising.

So, how do solar boats work? What are the benefits? And what are the best solar boats on the market? 

In this guide, we explain how solar boats function, the advantages of using them, and six impressive solar boats you can purchase in 2024.

Let’s dive right in!

Table of Contents

How Do Solar Boats Work?

In recent years, solar panel and rechargeable battery technology have improved dramatically. Panels are lighter, stronger, and more efficient.

Batteries are more compact, more efficient, and weigh considerably less than they did in the past. Both batteries and panels now last longer and cost less than they used to.

These advances in technology and a growing interest in eco-friendly sailing have shifted the development of solar yachts from idealists’ dreams to the mainstream.

So, how exactly do solar boats work? 

Solar boats use solar energy to power their motors, navigation systems, and onboard electronics, and appliances.

The solar system works much the same as a solar system on a house or RV , with some structural differences to meet the unique demands and challenges of a marine environment.

Solar panels mounted on the boat harvest solar power from the sun and send it to a charge controller , which controls the flow of electricity to a bank of rechargeable (usually lithium-ion) batteries.

From the batteries, power is sent to the electric motors, navigation systems and appliances via an inverter, which converts direct current (DC) to alternating current (AC). Most appliances like kettles, microwaves, and hair dryers use AC.

A solar system can be added to any boat, making it a hybrid or even just to supplement a little power using a renewable resource.

S olar is a great way to reduce your carbon emissions, reduce your fuel costs and increase the distance you can sail without stopping to refuel .

However, if you’re looking to buy a solar boat that is designed and built specifically for solar sailing, there are some really great options to consider.

What are the Benefits of Using a Solar Powered Boat?

When it comes to solar boats, there are some great benefits and they’re not limited to renewable energy and fewer carbon emissions:

• No reliance on fuel – diesel generators can be used as an emergency back up but they’re not needed for everyday sailing or electricity generation.
• Unlimited range: when batteries are constantly recharged by the sun, there is no need to stop to refuel and you can keep going indefinitely.
• No noise and no fumes: as there is no engine, there is no noise and no diesel fumes. This makes the experience of sailing a solar boat much more peaceful.
• No pollution: on a solar boat, there is no engine producing noise pollution, no carbon or greenhouse gas emissions , and no risk of fuel or oil spills.
• More space: the absence of engines frees up a lot of space. Electric motors and batteries can be housed anywhere on the boat and do not take up as much space as engines and machinery, which means room for more storage compartments to keep your gear or equipment.
• Lower running costs: beyond the initial investment and occasional maintenance, solar is completely free. This cuts out fuel costs and ongoing engine maintenance costs.
• Less maintenance: solar panels need to be cleaned regularly to be most effective but that is the only ongoing maintenance needed. Once a good solar system is installed, it generally needs very little maintenance.
• No limitations on electrical use: with solar, the supply is free and if you’re not pushing the motors to travel at speed you will often have more electricity than you need. This means you don’t need to watch your power consumption and you can run your air conditioning as much as you want!
• Options to sell power back to shore stations: if you regularly generate more power than you need from your solar, you can share it with others or sell it back to the grid at some shore stations.

The benefits you will enjoy from a solar boat vary, depending on your location and the specifications of the boat you choose. There are also some downsides, for example, solar boats are generally slower and the initial investment is quite high.

That said, solar boats are well worth the investment!

So, let’s look at some of the awesome solar boats available on the market in 2024:

6 Awesome Solar Boats

There are many great solar-powered boats to choose from and we have selected six of the best to feature here. We have chosen a range of sizes, styles, and price points so there should be something for everyone on this list!

1. Silent Yachts – Silent 55

The Silent 55 by Silent Yachts is one of their smaller solar yachts and can be handled by two people, with or without any additional crew.

It is spacious, and beautifully designed to be as economical as possible without losing any of the luxuries of their larger boats. With three to six cabins and all the amenities you can imagine, it offers everything you need to live on board permanently.

Check out this video by Kara and Nate to see their experience of the Silent 55 and meet the couple behind the iconic Silent Yachts company:

[embedyt] https://www.youtube.com/watch?v=iIte4FNI0U0[/embedyt]

Where to Buy: Silent Yachts

Price: From €1.97 Mio.

2. Serenity Yachts – Serenity 64

The Serenity 64 is a solar-powered hybrid yacht with a diesel engine. It can run on either, giving it a combination of unlimited range using solar or faster cruising using diesel.

It is a spacious and luxurious yacht, with plenty of living space and four cabins with en suite bathrooms.  The Serenity is the smaller of the two solar-powered boats offered by Serenity. The Serenity 74 is bigger and more luxurious, with an interior designed by Neiman Marcus Fashion Director Ken Downing.

Take a look at this video by Serenity Yachts to see more of the Serenity 64:

[embedyt] https://www.youtube.com/watch?v=ltyu-KPesg0[/embedyt]

Where to Buy: Serenity Yachts

Price: From $3.3 million

3. Sunreef Yachts – Eco 80 Sail Catamaran

Sunreef Yachts Eco sail catamarans take eco-friendly sailing to new heights. Their luxury solar yachts use a special ‘solar skin’ that covers any composite structure on the yacht to provide solar power from every angle.

They also use hydro and wind power to supplement the solar and have a sail. The green power generated on their innovative solar boats is enough to propel the boat, run all the onboard appliances and charge the electric water toys.

Taking their commitment to the environment up a notch, they use recycled and reclaimed materials, non-toxic paints, and natural fibers.

Check out the video below by SUNREEF YACHTS OFFICIAL on a day aboard the Sunreef 80 Eco Catamaran:

[embedyt] https://www.youtube.com/watch?v=hXFg1R1qcgI[/embedyt]

Where to Buy: Sunreef Yachts Eco

Price: Price on Request (depends on the custom specifications)

4. Soel Yachts – Soel Senses 48

The Soel Senses 48 is a 48ft solar electric catamaran. It was designed to be solar-powered and is slender and lightweight to make it more economical.

There are two sleeping berths for two people each, and another four people can sleep in the salon. The interior and the exterior are both sleek and modern.

Everything on the Soel Senses 48 has been designed thoughtfully to make it as comfortable and functional as possible. It is faster than other solar yachts, due to its smaller size and innovative design.

Check out this video by Jim Waltz to see a little more of the Soel Senses 48:

[embedyt] https://www.youtube.com/watch?v=t5IOCWPwGXY[/embedyt]

Where to Buy: Soel Yachts

5. Azura Marine – Aquanima 40

The Aquanima by Azura Marine is powered entirely solar and features some innovative adaptations that make it even more economical and eco-friendly. For example, rainwater collection from the solar panels on the roof and the fact that excess solar can be sold back to shore stations.

The Aquanima is beautifully designed and the interior is clean and modern. It has two double guest cabins and two single crew cabins. It is one of the most cost-effective options if you’re looking for a purely solar-powered boat.

Take a look at this video by Azura Marine to see the Aquanima in action:

[embedyt] https://www.youtube.com/watch?v=X25IRdHoHqI[/embedyt]

Where to Buy: Azura Marine

Price: From €523,000

6. Silent Yachts – Silent 80 Tri-Deck Solar Catamaran

The Silent 80 Tri-Deck Solar Catamaran is a superyacht that is completely customizable. It offers huge amounts of space, with three decks that can be customized to suit the owner’s needs.

The top deck can be open or enclosed and can be used as additional living space or a luxury master suite, opening onto a private outdoor space. Both open and closed versions include four to six customizable cabins.

As a solar-powered yacht, it has more space where the engines would normally be and that storage space can be used to house water toys and additional recreational equipment.

Check out this video by Yachts For Sale to see more on the Silent 80 Tri-Deck Catamaran, how it is built and what sets it apart:

[embedyt] https://www.youtube.com/watch?v=KCZMzE5Q8lc[/embedyt]

Price: From €5.51 Mio.

Final Thoughts on Solar Boats

As solar and battery technology has improved, and boat owners have become more conscious of their environmental impact, solar boats have become both more viable and more desirable.

Modern solar boats, from small solar-powered yachts to solar superyachts, are equipped with state-of-the-art technology to make them economical, easy to maintain, and a pleasure to use.

They’re also becoming increasingly affordable, and we hope, will be a mainstream option available to every eco-conscious sailor soon!

Electrek: I Drove A Rare Solar-Electric Yacht to Test Clean-Sea Propulsion, Here’s How It Went

Environmental Protection: The Environmental Impacts of Boating

Custom Marine Products: A Cruiser’s Guide to Selecting and Sizing a Solar Charging System

Forbes: Solar-Powered Yachting: A Look Inside ‘The Tesla of Yachts’

Knysna Yacht Company: Top Things to Know About Yacht Solar Power

Robb Report: How Zero-Emission, Solar-Powered Yachts Entered Boating’s Mainstream

Robb Report: Solar-Powered Yachts Are Taking Over. Here’s Why That’s a Good Thing

The Land Between: Recreational Boating and the Environment – Tips and Tricks for Environmentally Conscious Boating

Yachting Monthly: Sailing with Solar Power: A Practical Guide

Frequently Asked Questions

How does a solar boat work.

Solar boats use renewable energy from the sun to run their motors, electrical systems, and onboard appliances. They do not use petrol/diesel generators or engines and meet all their power needs using solar panels and batteries. Read the full guide for more details on how a solar boat works.

What are solar boats used for?

Solar boats are used for any boating purpose but they’re most frequently used for recreational sailing, such as yachts and catamarans, as ferries and tour boats, or as houseboats. Solar boats are generally slower and less powerful than fuel-powered boats. In situations where speed is needed, solar is usually supplemented with wind-sail or fuel-driven motors. Read the full guide for more on solar boats.

What is a solar yacht?

A solar yacht is a yacht that uses solar energy to power its electric motors and all the electronic equipment on board. Solar yachts do not rely on diesel or petrol engines and run solely on solar power. They do sometimes have other power sources, like backup diesel generators or engines. Read the full guide for more on solar yachts.

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Solar Yachts, A Very Bright Idea

Tens of thousands of years ago, humankind discovered that standing on a log and pushing with a stick would allow a person to cross a pond or a shallow lake. The push pole evolved into an oar, and we ventured across seas and along coastlines. Some genius figured out how to sail with the wind, and we crossed oceans.

We assumed for eons that maritime propulsion had evolved to its ultimate destiny. Then came the Industrial Revolution. Over several decades, Eli Whitney invented the steam engine and Etienne Lenoir, Nicholas Otto, and Rudolf Diesel all invented versions of an internal combustion engine. Throughout the last century, either the wind or a petroleum fired mechanical engine provided propulsion for pleasure craft.

The Solar Revolution is upon us. The yachting community and the maritime industry are actively adopting the next step beyond petroleum powered propulsion. Solar yachts, vessels propelled by the sun, are showing up in ports and marinas around the world.

What defines a solar yacht?

Any pleasure vessel using electricity derived from solar panels as a primary or alternative source of power for propulsion can be considered a solar yacht. Even if there are other propulsion systems aboard, the term “solar yacht” may be legitimately used. Consider that we call a vessel with masts and a “sailboat” even though there is typically another propulsion system available. The sails are seldom in constant use. Likewise, most solar yachts are not exclusively or constantly powered with electricity generated from photovoltaic cells.

Unique pleasures of solar and electric yachting

Sailors are more quickly prepared to appreciate the esthetic joys of traversing the waters at a leisurely pace. Imagine cruising where the cries of seabirds swirling overhead, the gentle slap of waves against the hull, and normal conversational tones are not drowned out by the 60, 70, or 80 decibel background drone of a rumbling diesel or thundering gasoline power plant. On an electric yacht, a shift in the wind doesn’t send everyone fleeing from the aft deck as exhaust smoke and fumes foul the air.

While a solar yacht will facilitate many happy experiences formerly reserved for sailors, there’s no need to scramble around the deck adjusting sails and rigging. No need to adapt to cruising “heeled over” at a 20 or 30-degree angle. No need to wait for the next opening of a drawbridge.

Solar yachts combine the ease of mechanical propulsion with the majesty of sail.

Limitations of solar yachts

Everything “under the sun” (pun intended!) has both advantages and limitations. The major limitations with solar powered yachts, compared with petroleum powered vessels, are range and speed. The hundreds or thousands of gallons of increasingly expensive fuel aboard a petroleum powered yacht provide a predictable, and often long range. The range comes at definite and measurable cost, as even moderate cruising speeds can burn more 3, 4 or more gallons per nautical mile. (One might observe that under sail range is unlimited- at least on those days when the wind is cooperating).

Very few builders are producing yachts relying exclusively upon solar power. Such vessels are recognizable by an oversized array of panels. Critics compare their appearance to an aircraft carrier defined by a huge flight deck, or a “floating solar farm.” The larger the square footage exposed to sunlight, the greater potential for electric power- but at some point, the sheer size becomes unworkable in close quarters and sea-keeping characteristics can radically change. Even with a 100% solar design, speed and range limitations remain.

According to leading scientific experts, the sun doesn’t shine at night. Just as sailboats rely on alternative power when the wind isn’t blowing, solar yachts will require an additional source of propulsion to allow operation after dark.

Solar yachts and current technology

Solar voltaic technology is rapidly advancing, but it’s likely that the industry remains decades away from any breakthrough technologies that will provide a 100% solar yacht with range and speed options comparable to contemporary petrol-powered vessels.

Fortunately, hybrid technology facilitates combining the benefits of solar yachting with the greater speeds and longer ranges of yachts powered solely by internal combustion engines. Everyone is familiar with hybrid technology in use by automobiles. Electric motors operate the vehicle at slower speeds, with an internal combustion on standby for longer distance and higher speed driving. The automotive and marine approaches to “hybrid” power are similar.

The largest commercial ships normally rely on a "serial" system, which uses diesel-driven generators to create electricity to energize motors turning the propeller shafts. In contrast, smaller vessels and private yachts use a “parallel” hybrid system, which uses two or more methods of propulsion to turn a prop shaft. Hybrid redundancy provides a margin of safety and convenience. Should one propulsion system fail for any reason, there’s “backup” available so a vessel can remain underway. Most solar yachts are configured as hybrids, with electricity from solar panels used to recharge batteries powering electric motors.

Greenline solar hybrid yachts

Greenline Yachts is the acknowledged leader in the solar hybrid yacht industry. While many builders have solar and hybrid powered boats “on the drawing board,” Greenline has launched more than 600 premium-quality vessels since establishment in 2009.

Greenline’s approach to solar yachts includes the reasonable and aesthetically pleasing use of solar panels on the upper surfaces of their boats. Energy from the photocells is transferred through a converter-charger to a large bank of lithium/ion batteries below decks- occupying the space where one would expect to find the large engines and fuel tanks on a petrol- powered yacht.

Greenline resolves speed and range considerations by employing small diesel engines driving the same shaft as the electric motors. Like the automotive application, the electric motors manage the slow speeds, and the diesel engines are called upon when higher speeds are desired. When the internal combustion portion of the hybrid system is in use, it provides an elevated level of DC power to quickly and efficiently recharge the storage batteries.

Solar cruising is now a reality

Greenline Yachts specify that their solar hybrid vessels can travel 20 nautical miles, up to 6 knots (sailing speed) without engaging the diesel-powered portion of the system at all. With an optional expanded lithium battery bank, a range of 40 nautical miles can be achieved. Many boaters who are not in a particular hurry to “get there” will discover that a 40 nautical mile range is more than adequate for local excursions on summer evenings, or even a weekend cruise to a nearby park or marina.

Most pleasure boaters spend more time on the water during the summer months. Days are much brighter and longer. More solar energy is available to rapidly recharge the batteries and extend the range of a solar yacht.

Solar yachts used primarily for cruising from one marina to another have access to an already existent charging network- the shore power pedestal at every slip. Lithium batteries charge in about half the time of old-fashioned lead/acid batteries. Lithium batteries can be discharged further, additionally extending range.

Solar yachts can enhance the experience when cruising to remote locations. Many docks at destinations in northern BC and Alaska, for example, have no shore power. Solar panels will keep the battery banks topped off to provide lights, refrigeration, and other essential needs no matter where one chooses to dock or anchor. No need to disturb the peace and tranquility by firing up a noisy generator.

There is, however, one destination that solar hybrid yachts won’t visit with any remarkable frequency: the local fuel dock.

For Additional Information

A highly select network of about sixty dealers, worldwide, represent Greenline hybrid yachts. In the Pacific Northwest, Ocean Pacific Yachts represents the line from their offices in Seattle, Washington. Contact us at 206-659-0710 for more details and to schedule a sea trial. Our sales team is considered an authoritative resource for answers to general questions about hybrid yachts and electric yachts.

EXPLORE GREENLINE HYBRID YACHTS FOR SALE

Greenline 39.

GREENLINE 40

GREENLINE 45

GREENLINE 48

GREENLINE 58

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Choosing the Best Marine Solar Panels for Your Boat

There’s nothing like kicking back and relaxing in a boat all to yourself. But while sailing the waves and soaking in the sun is an awesome getaway, you’ll still need to think about how to generate electricity while on board, especially for running your boat battery.

Get free power through solar energy with the best marine solar panels. Not only are they easy to set up and use, but you also save money by relying on renewable energy instead of paying expensive electricity bills like usual.

But how do you look for the most suitable solar panels for boats if there are dozens of solar panel types out there? Well, you’ve come to the right marine solar panels review. There are three key things you need to keep your eyes out for when choosing marine solar panel kits for your beloved boat.

• Waterproof: Since you’ll be traveling across bodies of water, you have to anticipate that your solar panels could get wet. Make sure your solar panels are resilient against water damage through waterproof designs.
• Flexible: Boats have curved surfaces, unlike roofs that are flat and can do with rigid panels. Marine solar panels can be straight and conventional, but it would be a big help if they were flexible so that you can mount them on tricky surfaces on your boat. Flexible solar panels hug irregular surfaces, ensuring they don’t topple over as your boat moves.
• Thin: Boats are small spaces as it is. You don’t need bulky, rigid panels occupying more space than necessary. Go for ones that are about an inch or so thick. Thinner solar panels are sleek and don’t take up too much space, so they’re a must for marine solar solutions.

There are many other factors you need to consider when looking through boat solar panels for sale. Check out the rest of the important factors in our buying guide below.

Need more help picking out a good boat solar panel kit? Look through this rundown of solar panels for boats reviews to see some of the most popular options.

Best Overall

Renogy Monocrystalline Solar Panel

Premium Choice

Topsolar Solar Panel

Editor’s Pick

ECO-WORTHY Solar Panel

Table of Contents

1. Renogy 100W 12V Monocrystalline Solar Panel

2. topsolar 20-watt monocrystalline solar panel, 3. eco-worthy 25w off-grid solar panel, 4. renogy extremely flexible solar panel, 5. suner power 30w polycrystalline solar panel, 6. newpowa monocrystalline 100-watt solar panel, 7. rich solar polycrystalline solar panel, 8. topsolar 100-watt 12-volt solar panel kit, 9. newpowa monocrystalline 30-watt solar panel, what to look for when looking through marine solar panel options, how many solar panels do i need to run a boat, how many amps does a marine refrigerator use, how do you install solar panels on a boat, top-rated marine solar panel reviews.

• Material: Monocrystalline
• Wattage: 100W
• Voltage: 12V

This solar panel kit by Renogy is awesome because it’s an all-in-one solar system. It includes all the necessary cables and accessories to get the show on the road.

The convenient kit includes a 100-watt solar panel, the Wanderer 30A PWM controller, and connectors and adapters. It even has Z brackets for mounting your solar panel. I like that I didn’t have to purchase all these separately.

I like that the Wanderer charge controller is negative ground, which means it prevents any overcharging and short-circuiting issues with our batteries.

Now, for the solar panel itself, I appreciated how the frame was made of sturdy, high-quality, corrosion-resistant aluminum, making the panel extra durable.

Its monocrystalline solar cells can convert 21% of the solar power to free energy you can use on your boat. That’s pretty high compared to other solar panels.

Plus, the production power of this solar panel kit is quiet, so it won’t bother you when you need silence.

• Includes the necessary connectors, controller, and mounting brackets
• The negative ground controller stops overcharging and short circuits
• The solar panel has a durable, corrosion-resistant aluminum frame
• Monocrystalline cells convert 21% of solar power into free energy for you
• Power production is quiet, so it will never disturb users
• The charge controller has no LCD screen
• Wattage: 20W

This Topsolar solar panel kit is another one that offers a lot of accessories. It comes with a charge controller, some alligator clips to hold your cables and connectors properly, and even an O-ring terminal.

The solar panel itself is made of thick, high-class tempered glass to protect the cells inside. It’s framed with aluminum for extra sturdiness as well. I love that it’s made of such premium materials, so I never have to worry about it being too flimsy or break apart easily.

All in all, the solar panel weighs a mere 4.8 lbs, making it easy to carry around. It’s lightweight enough for effortless lifting and transporting when I’m about to install it or move it to another area.

This marine solar panel is resistant to harsh weather, thanks to its maximum static load of 2,400 Pa. Because of this, you can use it worry-free, even in inclement climates.

There are pre-drilled holes at the back of the panel to make it easier to set up with screws and grommets.

• Comes with a charge controller, alligator clips, and O-ring terminal
• The panel is made of tempered glass and an aluminum framing
• Weighs only 4.8 lbs, so it’s easy to lift and carry around
• Resistant to harsh weather like wind or snow
• Has pre-drilled holes at the back to make set-up easier
• Doesn’t include mounting brackets
• Material: Polycrystalline
• Wattage: 25W

A long lifespan is one of the top factors I consider when looking for a marine solar panel. This one by ECO-WORTHY ticks off that box because it is built to last.

It’s made with highly efficient cells to give me adequate power output. The framing is designed with aluminum to make it sturdy, increasing its longevity.

This off-grid solar panel kit comes with a convenient charge controller. Its interface may not have a modern display screen, but it does have light indicators that update in real-time so you can tell how far your charge is coming along. It also has a USB port to let you charge your phones and other small devices.

The solar panel set comes with SAE connector cables to help users set up. They’re quite long and stretch to 9.84 feet, giving us maximum flexibility for moving our panel and charge controller around.

ECO-WORTHY offers a one-year warranty for this kit. You’ll also have access to the brand’s 24/7 hotline in case you have questions or concerns with your solar panel.

• Made with high-efficiency solar cells and aluminum for longevity
• Charge controller has power indicators that update in real-time
• There’s a USB port on the charge controller for small devices
• The SAE connector cables are quite long at 9.84 feet
• A one-year warranty with 24/7 technical support from ECO-WORTHY
• One 25W solar panel might not be enough to power multiple appliances

Setting up solar panels on curved surfaces is tough, but with these Renogy flexible solar panels for boats, it’s never a challenge.

These flexible solar panels bend to a 248-degree arc, which is a lot more flexible than other bendable panels. This is excellent for boat and yacht decks that are curved.

The panels are made of monocrystalline cells that emit 100 watts, ensuring a strong and reliable power supply for our consumption.

Transporting and setting up these flexible solar panels is a walk in the park, thanks to its lightweight and super thin design. They’re never bulky and retain the smooth silhouette of your boat.

They’re thin and light because they’re designed with advanced polymer, which is 70% lighter than other materials traditionally used to build solar panels.

These flexible panels are made to withstand bad weather. They resist impact and don’t get damaged in heavy loads of rain. You’ll find that they even tolerate up to 5,400Pa of snow.

• Bends to a 248-degree arc to fit irregular and curved surfaces and decks
• Monocrystalline panels emit a consistent 100 watts
• Super lightweight and ultra-thin, making it a breeze to transport
• Made with advanced polymer that is 70% lighter than traditional materials
• Resists impact and damage from heavy loads of rain and snow
• The cables in the solar panel kit aren’t the same length

These solar panels by SUNER POWER are built with high-efficiency polycrystalline cells, giving me great performance even with the small energy output. They emit up to 30 watts of power to use as free energy on the boat.

This kit charges our batteries safely. It goes through a strict three-step intelligent algorithm to make sure our battery doesn’t go through overheating and short-circuiting, so I know I’m extra safe.

You’ll also find bright LED lights on the charge controller that indicate how the charge is coming for easy monitoring. It’s a convenient way to make sure our charging is right on track even when we’re doing other errands on the boat.

Tough weather conditions are nothing when it comes to this marine solar panel. It’s built with IP65 waterproof technology, so I don’t have to worry about the climate damaging my solar panel kit. It can even resist erosion, rusting, and damage from the sun’s UV rays.

• Polycrystalline cells emit 30 watts of power to use as free energy
• Charges our battery safely with an intelligent three-step algorithm
• Has bright LED light indicators so you can see how your charging is going
• Withstands tough weather because of IP65 waterproof technology
• Resists erosion, rusting, and UV damage in finicky weather
• The wires could be longer

This Newpowa monocrystalline panel is smaller in size compared to most other panels. It comes up to about 45 x 20 inches, making it more manageable than bigger ones.

It’s made of monocrystalline cells that are highly efficient in turning power from the sun into free energy for our consumption and charging.

The panel’s aluminum framing prevents any corrosion, which extends the lifespan of the solar panel kit. That means I won’t have to constantly replace it.

The marine solar panel and some of its accessories are made to be waterproof. That way, they’ll survive even the most horrible weather conditions as you sail.

Venturing to areas and cities without much bright sunlight is no problem for this marine solar panel kit. The junction box is equipped with bypass diodes that ensure users don’t get any power outages even in cloudy, shaded areas.

• Smaller in size and more manageable than other solar panels
• The monocrystalline panels are efficient in converting power into energy
• Aluminum framing prevents corrosion, extending the solar panel’s life
• These monocrystalline solar panels can survive horrible weather
• Junction box has diodes to let your power work even in low-light areas
• You don’t get the rated 100-watt output every single day

This RICH SOLAR panel is one of my favorites for travelling. I love it because it allows for more sunlight absorption. The panels’ anti-reflective, high-transmission film also helps make energy conversion more efficient.

Because of these factors, this panel works extremely well even in areas that are low in sunlight . So when I know I’m going to be sailing to cloudy shores, I make sure to bring this panel along.

This set uses quick-connect cables that don’t take more than a few seconds to fix up. It makes installation fast and easy even for beginners.

There are also about 14 holes on the panel so that you can simply screw it onto your mount. That means you can set it up without the complication of drilling the holes yourself. The design is also compatible with a variety of mounts, further adding to user’s convenience.

• Its anti-reflective panels are high-transmission for even more efficiency
• High conversion efficiency even in areas without bright sunlight
• Uses quick-connect cables, so setting up is fast and easy even for beginners
• There are 14 pre-drilled holes on the panel for quick installation
• Works with many types of mounts
• Doesn’t include mounting brackets, so you have to purchase some

This solar panel by Topsolar emits 100 watts of power to charge any 12-volt battery while you’re on the go. It’s perfect for cars, RVs, and a huge range of off-grid uses, but it works excellently for boats too.

The panel is made with monocrystalline cells, protected by a coating of high-quality tempered glass. This protective layer also prevents wear-and-tear in the long term. Meanwhile, anodized aluminum frames the panel, protecting the edges from corrosion.

You get a V-shaped bracket along with your panel in this kit. This bracket allows users to tilt the panel in whatever direction they desire. It’s very helpful when we’re trying to position the panel to face the sunlight directly.

The charge controller this solar panel comes with is made with IP67-rated waterproof technology. This means it prevents any water damage from ruining our solar system.

• Charges any standard 12-volt battery while you’re on the go
• A wide range of uses
• The mono cells are protected with wear-resistant tempered glass
• The framing is made of anodized aluminum to protect the panel’s edges
• Comes with a V-shaped bracket to tilt the panel in the direction of the sun
• The charge controller is made with IP67 technology to avoid water damage
• The panel is quite heavy at almost 16 lbs, making it heavy to carry

This Newpowa panel emits 30 watts of power. That may sound small to some people, but it’s perfect for charging small devices and running just a few appliances on a short boat ride.

It’s made with high-efficiency monocrystalline cells. These cells allow for a more compact panel design that is smaller and more manageable than the brand’s polycrystalline panels.

Multiple layers of the panel protect its cells. This includes an ethylene-vinyl-acetate encapsulation, iron tempered glass, and even a TPT back sheet that can help with heat dissipation.

There are wires already pre-attached to the panel, one at 3 ft and another at 1 ft. Both of these have Anderson connectors as well, so users don’t have to fuss about setting them up themselves.

The panel also has holes pre-drilled in them, so it’s ready to be screwed into your mount or bracket of choice.

• Provides 30 watts of power, perfect for small devices and short trips
• Made with high-efficiency mono cells that allow for a compact design
• Cells are protected by multiple layers, like tempered glass and TPT backing
• The wires and connectors are pre-attached, which is great for beginners
• Comes with mounting holes already drilled on the back of the panel
• The solar panel isn’t weatherproof, so you can only use it on sunny days

HQST 100W 12V Solar Panel (Outdated)

This 100-watt solar panel by HQST is designed for efficiency and durability. The panel itself is anti-reflective, thanks to thick and durable tempered glass. It’s also lined with aluminum in its framing, which resists corrosion and damage to the panel’s edges.

Polycrystalline solar panels like this one are made with high-efficiency cells that convert more power into energy than the usual panel. They also contain diodes to bypass any power outages or drops when your boat travels into a shaded area.

This kit’s junction box is rated IP65, which means it’s waterproof. That way, it can resist damage from water jets and uncontrollable weather.

Installation is a breeze with the pre-drilled holes at the back of this panel. It’s perfect for newbies that don’t want to call in a professional to set it up.

• The anti-reflective panel is made with sturdy tempered glass
• An aluminum frame
• Polycrystalline panels efficiently convert the sun’s energy into power
• Contains diodes to bypass power outages when you go into low-light areas
• The junction box is rated IP65 to resist damage from undesirable weather
• Comes with holes drilled at the back of the solar panel for easy mounting
• The wires on the panel are quite short

WindyNation 100W Off-Grid Solar Panel (Outdated)

I love that this solar panel by WindyNation gives off a consistent 100 watts of power, provided that the panels are positioned directly under the sun. That makes it an ultra-reliable panel that isn’t flip-floppy when powering our devices.

The solar system comes with many accessories you’ll need to set up and use your panel. There’s a quality charge controller, some mounting brackets, and all the necessary cables needed.

My favorite part about this system is the charge controller. It has a high-quality LCD screen that displays all the information I need to see about my battery as it charges. It even has a sensor to help me monitor the battery’s temperature.

I can also choose and adjust what information settings are shown on the screen, depending on my preference. Buyers can get whatever information they’d like to know—amperage, amp-hours, temperatures, voltage, and more!

• Consistently provides 100 watts of power when positioned under the sun
• Comes with a charge controller, mounting brackets, and cables
• The charge controller has an LCD screen
• Sensor for battery temperature
• You can choose and adjust what settings to see on your LCD screen
• You must purchase fuses and fuse holders to complete this solar system

SUNER POWER 12-Volt Waterproof Solar Panel (Outdated)

This solar panel by SUNER POWER doubles as a battery charger. It’s powered by highly efficient polycrystalline cells on a sturdy solar panel. These solar cells generate battery power in any condition, even when the sun isn’t so bright.

The charging system follows a stringent and smart three-step algorithm, keeping your battery safe as it charges. It does so with a unique “Maximum Power Point Tracking” (MPPT) chip, which prevents battery issues like overcharging and short-circuiting. MPPT also allows the charge controller to generate up to 30% more power than others do.

The controller has a LED light where you can see all the pertinent information on your battery, like whether it’s charging and if the battery’s full.

This entire solar system is made with IP65 waterproof technology. It won’t be susceptible to water damage, so users don’t have to worry about backflow from the water around the boat causing damage to it.

• High-efficiency polycrystalline solar cells generate power in any condition
• Has a smart three-step charging algorithm for a safer charge
• Its unique MPPT chip protects your battery
• MPPT controller generates up to 30% more solar power than others
• Has a LED light to indicate battery status
• The system is IP65 waterproof, so it won’t be susceptible to water damage
• Designed to work only on 12V batteries

Easy to install through grommets or adhesives

Setting up traditional solar panels on regular surfaces like walls and roofs can be difficult as it is. It might be trickier on a moving, swaying boat.

Make sure your marine solar panels are a breeze to set up. Look for ones that are okay to simply stick onto surfaces with adhesives, or have pre-drilled holes so you can screw them onto a mount quickly.

Provides an adequate amount of energy to power up your batteries and appliances

Select marine solar panels that will give you the right amount of solar power to meet your energy requirements.

For example, if you only need solar power on the boat to charge devices in the short term, 50W or 100W might be enough for your trip.

However, if you intend to use your solar panel to charge marine battery, you’ll definitely need one that converts a higher amount of solar energy—perhaps some 200 watt marine solar panels.

Comes with all the necessary accessories, like connectors and junction boxes

Don’t put yourself through the hassle of buying each part of your marine solar system separately. Look for solar panels that provide all the necessary cables, boxes, and accessories to get you set up immediately. Ensure that your panel comes with connectors, junction boxes, charge controllers, and more.

Manufactured by a legitimate and respectable solar power brand

You must always purchase solar panels from legitimate brands that will give you top-notch and high-quality panels. There are many bogus panels in the market today, so double-check to make sure the solar panels you’re buying come from good, renowned manufacturers

If you’re not sure which solar panels to buy, it’s wise to go for classic, tried-and-tested brands. These include Renogy, TP-Solar, and SunPower marine solar panels.

Plus, buying from bigger brands will increase your chances of getting a product warranty that lasts years.

It depends on how much power you need to keep your appliances and gadgets up and running.

For shorter, one-day excursions, you can live with just one or two high-quality solar panels to provide some electricity to charge your phones and maybe a mini-fridge for the day.

But if you’re planning to sail for longer and live on the boat 24/7, you’ll probably need a bigger boat solar system with as many solar panels as you need. This is because you’ll likely have to run bigger appliances and lights, which demands more solar energy.

If you have a 12V marine refrigerator, it will likely only use up anywhere between 2-6 amps per hour. One solar panel emitting a usual 100 watts is more than enough power for such a fridge.

There are many different ways to set up solar panels on boats. If your solar panel is flexible, thin, and ultra-light, you can simply secure it in place with adhesives.

Thicker panels may need to be screwed in with grommets. If this is the route you’re going for, make sure you have sturdy mounting hardware to place your solar panels in.

Traveling through water may be relaxing and stylish, but the excursion is never complete without the best marine solar panels to provide solar energy and battery power during your trip. Hopefully, this round-up of traditional and flexible marine solar panels reviews help you out on your hunt to find the best panels.

Just make sure your panels are efficient in providing high power, waterproof to avoid damage from the sea, and thin and lightweight for easy mounting and storing. If you tick all those boxes, your sailboat solar panels should be all good.

I am Kathleen Miller, staff writer and reviewer of the Avasolar team. Working with the team has been a pleasure for me so far, I hope to bring readers useful information by creating detailed and easy-to-follow contents.

photo© www.svdelos.com

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At Sun Powered Yachts we hope to inspire and inform yacht owners on the benefits of going solar with SunPower & Maxeon. We're here to answer any questions you may have. 

With a background in sailing & solar, and also from living off-grid for 11 years in Hawaii, we have the knowledge to help you with your solar install.  Find out more about us  

In 2021-2022 we spent 15 months as a family living aboard our sailboat, a Dufour 382 sailing from Corsica to Cancun and more recently to Florida & Bahamas .   An intrepid adventure of over 7,000NM visiting 12 countries along the way.  We're available for solar consultations with SunPower & Maxeon panels in stock in the USA ready to fulfill orders. 

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Federal Tax Credits

Have you heard about the Federal Tax Credits that you could take advantage of for going solar on your boat?  Yes, your boat! 

Do you have a head, galley & bunk aboard? Then you may qualify and t he Federal Tax Credit has now gone back up to 30% of the total cost to put your solar system in place.

This can include solar panels, controllers, wiring, labor etc. and can now more easily include batteries - maybe time for that lithium upgrade to Battle Born

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Solar panel systems burn zero fuel and have no moving parts. They are clean and silent, producing no atmospheric emissions or greenhouse gases that are harmful to the earth.  Enjoy those quiet anchorages with no more noisy engine/generator running just to charge your batteries.

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The simple and easy installation of SunPower® E-Flex panels on your bimini, dodger, or deck, will reduce costs of adding an expensive davit or custom racking and mounting solution for traditional large & heavy fixed  frame solar panels.

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Incredibly reliable and easy to maintain. With no moving parts, visual checks and servicing easily keep systems operating. Solar panels are robust & durable with a junction box designed with a high level of protection from dust & water ingress.

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News & reviews.

Maxeon to open new factory in USA

Great news! Maxeon recently announced (Aug 10th) that they will be opening a 3 Gigawatt factory in New Mexico. Construction will begin Spring 2024 and so by 2025 that's high efficiency Maxeon solar panels being made right here in the USA! 

Read our news post for full details.

For sale - 'Blake' our Dufour 382

Are you looking for a boat already set up to go cruising?  We have our 2016 Dufour 382 GL 'Blake' listed for sale on Yacht World .  She is the adventure version with taller mast/deeper keel, 950W of SunPower flexible solar panels, a DC watermaker, new dinghy and plenty of safety gear.  Currently hauled out in Freeport, Bahamas.  For more details contact our broker Amanda Haley with South Florida Sailing

T: 954 444 2283

Check out our Install List  

We have added an Install List page to our website which currently has over 130 installs from our customers.  Get inspired by what other boat owners have added for SunPower & Maxeon solar panels. 

Maybe you own a Lagoon 400 or a Morgan 41 and wonder what panels might fit aboard, check out the list to see how other owners have gone solar aboard.

Calico Skies 3x 410W

Bill & Grace sail Calico Skies , a Sabre 36, and whilst in Mexico they installed 3x410W SunPower fixed frame solar panels as part of a major upgrade to their arch/davit system.  

Check out their YouTube episodes including  #177 to see how they get on adding 1,230W (or 1.23kW) of SunPower solar panels.

Calico skies install details

"We made 7.2kWh yesterday out of our panels, what an upgrade!" 

Bill & Grace

SV Delos 3x 410W + flex

Brian & Karin of SV Delos   installed 3x410W SunPower fixed frame panels when on the hard in Mexico ( YouTube Ep.407 ) 

Combined with their SunPower E-flex panels, which have been aboard for ~3 years ( YouTube Ep.262 ) they now have just under 2,00W of solar keeping them powered up in the Pacific - awesome! 

SV Delos install details

"Love our new 410W panels and they're the same size as the old 300W ones - woohoo!"

Brian & Karin

Sailing La Vagabonde 2x 470W + flex

Riley & Elayna of Sailing La Vagabonde have been working on their new Rapido 60' trimaran and added 2x470W Maxeon fixed frame panels. 

They also have 6x170W SunPower flex panels they can deploy when needed.  With a 48V battery bank these panels are wired in series  YouTube episode

SLV install details

"Thank you, the solar panels have been absolutely incredible."  

Riley & Elayna

Testimonials

"So now I generally

Don't bother hooking, up to shore power".

     Thanks for all the help in planning my solar project for my boat. The two 170W flexible panels fit well on my Bimini and now I generally don't bother hooking up to shore power.  Although I haven’t had any long trips since my installation I have done a few day trips. And even with fridge, radio, plotters, autopilot and occasional radar it seems that these panels are keeping up with my usage. The advice and service has been great.   Thanks again.

Jeanneau Sun Odyssey 469

"It is by far the best decision I made "

         I bought a solar system from Sun Powered Yachts in 2020. It is by far the best decision I have made for the electrical system on my boat. I would (and do) recommend Sun Powered Yachts to anyone looking to add solar to their boat.

Endeavour 33

"Terrific customer service, always responsive"

         The process of researching a solar solution for my Beneteau 41 was simplified & clearly understood once I discovered Sun Powered Yachts.  Terrific customer service, patient, always responsive with guidance and products that just work. Being a novice at setting up a solar system, I had many questions along the way, and the team at Sun Powered Yachts were always there to answers my questions and provide support.

Beneteau 41

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Practical Boat Owner

• Digital edition

Boat solar panels: Everything you need to know to get started

• David Berry
• October 13, 2021

Want to add some boat solar panels, or wonder how to make the most of those you already have? David Berry has some advice...

While it seems like a good idea to mount a panel on the coachroof the chances of it becoming shaded are increased. Here the mast or rigging can easily throw a shadow over at least part of the panel, seriously reducing its output. Photo: Catchlight Visual Services/Alamy

Keeping batteries topped up without resorting to running the engine is an ongoing problem for yachtsmen. Boat solar panels are an obvious option, not just in the Med but also around the coasts of the UK as the price of panels has fallen over the years.

But choosing them can seem a bit of a black art: after all, how can you possibly predict how much sun you’re going to get during the season, or how much power your panel will produce if it’s not exactly aligned with the sun? But provided you accept a statistical approach using established databases, then prediction is easier than you think.

Ultimately the only thing we need to know is the conversion efficiency, or, how much sun turns into electrical power. NASA do a trick: they use multi-layer panels where each layer responds to a different wavelength so the usual 20% or so is doubled.

Article continues below…

Battery maintenance for boat owners: How to look after your boat batteries

For all but the smallest and simplest of craft a reliable supply of battery power is essential to keep both…

What is insolation? How much power is reaching my boat’s solar panels?

The sun is 93 million miles away, give or take. Packets of energy called photons leave it and travel at…

And there is a new material called Perovskite which is also used to provide an overlay on the standard silicone panel and the tandem panel is claimed to convert up to 28% of the sun’s energy into electricity.

Don’t rush though, when I looked on Amazon for one I discovered even the books describing it cost around £100! The panels themselves seem to be still in development.

How much energy does my boat need?

The first step is to work out your boat’s energy requirements. All you have to do is add up all the energy in watt-hours used by each device on your boat, such as the fridge, lights, computers and so on.

Energy is power accrued over time, so if power is measured in watts, energy is watt-hours. This can be tricky, for example how long is your fridge running for? And how about overnight? How much energy do the instruments take? Or your computer?

You can measure the power by measuring the Amps and Volts and multiplying them together to get Watts, but somehow you need to come up with a table similar to the one below. Once you have your energy requirements worked out, I suggest you add a goodly margin for expansion and errors – at least 10%.

Energy requirement for Aderyn Glas over the course of a day. ‘Current’ is Amps. ‘Duty’ is the portion of the day the (12V) appliance is powered up. eg Fridge 4A x 12V x 12hr = 576Wh

Next, you need to decide how much of this requirement should be met by the boat solar panels. We sail our Moody 33 Aderyn Glas throughout the summer season from our base in Preveza, Greece, so our requirements are essentially those of liveaboard sailors.

We want the panels to be able to supply most of our power needs and allow us not to have to ruin the peace of a quiet anchorage by running the engine simply for charging.

Weekend sailors might be content with a small panel to recharge – over the course of a week – the energy used during a weekend’s sailing. Getting the balance right is important, especially if you want to install enough boat solar panels to more or less cover your power requirements.

David Berry’s Moody Eclipse Aderyn Glas has boat solar panels mounted on a stern gantry where shadows are greatly reduced

But will you get the quoted wattage from your panel? If the panel is a 100W panel, will you get 100W? Panels are rated as the electrical power produced under certain strict test conditions, and these are solar irradiation (called insolation) of 1,000W/m2 at 25°C and an atmosphere of a particular clarity. Do we ever get these conditions in practice? Well, yes, we do, but life is never that simple – in this article I explain about how to assess the real insolation over the course of a day in your chosen location.

Types of boat solar panel

Leaving aside the exotic new Perovskite panels, there are three types that you might consider – a choice that hasn’t changed in years.

There are amorphous panels (good in shady conditions but large for any given wattage), printed panels (manufactured with an inkjet printer but really low conversion efficiency) and crystalline panels either poly- or mono-crystalline.

The smaller amorphous panel is 15W and the larger crystalline panel is 100W. So the larger panel is approximately twice the area, but seven times the power

What type of boat solar panels should I fit?

This question is a bit of a red herring – in reality, the question should be ‘How much space do I have?’

The academic drive is to make panels that are more environmentally friendly, both to make and dispose of, and to reduce the cost per watt.

But ironically this has resulted in a much poorer conversion efficiency generation by generation, which is not helpful to sailors with a small area available to mount the panels.

These panels are printed on a continuous inkjet printer with the idea that they can effectively be an endless strip. The problem with that, though, is the current can build up and eventually burn out the connecting cables. Furthermore, they are no good for yachts because the conversion efficiency is so low so you’d need a battleship in order to have enough space!

So, back to the first generation: crystalline panels come in mono- or polycrystalline species, but they only differ slightly in cost per watt and efficiency.

Added to the mix is the flexibility aspect: flexible panels require a bit of clever manufacture, and this is passed on in higher prices.

Many sailors think flexible panels are a solution because they can be mounted on the deck or coachroof or even the bimini but I’ve not considered them because all those places seem to suffer from shading, more of which later.

A hypothetical energy balance. The red line is the clear-sky power that the panel could provide during daylight. The blue line is the power your boat requires. Light blue is surplus energy, where the panel is outputting more than the load, and dark blue is where the load is greater than the panel can deliver. When night falls, the boat’s energy needs have to be met by the battery. In daylight, the battery becomes a load for the panels as it is charged. The green line is a notional illustration of the state of the battery; it winds downwards when there’s a shortfall and upwards when there’s a surplus available for charging. In winter, the load profile will be different and the captured power will be lower.

So does this mean the default starting point for any installation is a rigid, crystalline panel? In short: yes!

Where should I install my boat solar panels?

If you’re just fitting a small panel to top-up batteries on a mooring, buy a cheap rigid panel and find places on your boat where you can tilt it to catch the sun’s rays for the majority of the day.

We do this during the winter in Greece, where we strap on 20W or so of car battery top-up panels, and it works well for us. Choose a spot that isn’t shaded for the majority of the day and this technique should serve you well.

Do the sums. I have heard of people whose batteries have been damaged by a constant high power being applied to an already charged battery, even through a regulator. My rule of thumb for trickle-charging is a panel wattage about 10% of the battery’s stated amp-hours, but that’s a guess.

Aderyn Glas is fitted with two monocrystalline panels which are rated at 100W apiece – they take the same space previously occupied by amorphous panels which could only muster 75W between them

If you spend more time on board and need to get the best from your panels, mono- or polycrystalline panels will give more power from the same space. We replaced our 75W bank of amorphous panels with 200W of monocrystalline panels in the same area.

But with the higher efficiency comes higher sensitivity to poor mounting conditions, so if you want the best from your panels you need to do your utmost to ensure they’re not shaded, and also that they are tilted as close to a right-angle to the sun as possible. This is why liveaboards often mount theirs on adjustable gantries at the stern or on the pushpit.

Intrinsic losses

Let me just revisit this: the relationship between the nominal power of a boat solar panel and what you really get. When the manufacturer quotes, for example, 100W for a panel, that is the expected output under test conditions.

Choose your site carefully – this coachroof panel will be shaded by the boom, reducing its output by a considerable margin

The test conditions are an insolation of 1,000W/m2 at 25°C. So a typical panel of half a square metre will receive 500W of insolation, then we multiply by the efficiency of 22% or 0.22 and you get roughly 100W. So if you get a sunny day that insolates your 100W panel at 1kW/m2 then you have the potential to get 100W output for a short time around solar noon.

But the energy over 24 hours will be below this owing to the declination of the sun over the course of the day. This can be partly remedied with a tracking panel, but as the sun declines the light has to pass at a more oblique angle through the atmosphere, hence losing power.

The insolation will also be affected by your latitude, and by any form of shading or scattering from atmospheric dust, haze or cloud. Another important intrinsic loss is that heat reduces a panel’s output by about 5% for every 10°C rise in temperature greater than 25°C. For this reason, it’s quite possible to get a higher output from a boat solar panel in cooler northern latitudes than on the Equator!

This is the comparison between an MPPT controller and a PWM type over a 30 minute periodSo you see what I mean when I say the question is all about how much space you have: the default option should be a crystalline panel because it has the best watt per unit area coupled with price per watt, and we only need to deviate from this simple first-generation solution if other factors are important.

Cost and efficiency

Since we’re only talking about crystalline panels the efficiency is always going to be around 20% and the cost less than £1/Watt.

There are a large number of suppliers out there now but I should stick to the well known names such as Kodak, Polaroid, LG, Panasonic and Victron.

For suppliers I would look at Amazon (of course) or, in the UK, Midsummer Energy which stocks not just panels but all the cables and bits you will need to fit them.

Victron MPPT controller

Other boat solar panel system losses

Losses in cables are proportional to the square of the current. The equation is P=(i x 2) x R where ‘i’ is the current in amps, R is the resistance in ohms and P is the power lost in watts. The voltage gradient from the high voltage at the panels to the lower one at the regulator is fixed by the cable resistance and current (Ohm’s law), which is in turn set by how sunny it is and the power required.

But the resistance is a matter of design. To minimise cable losses and prevent potential cable overheating, large-core cables are needed. Resistance is also proportional to the length of the cable, so long cables need to be even fatter than short ones. I tend to use car speaker cable which is fat and can insulate the 12V we need.

Of all the possible ways to lose power from a panel, this is the most significant. On a crystalline panel, even the stripe of a rope’s shadow can wipe out a huge amount of the potential output power. Why is this? The individual cells in a crystalline panel are wired in such a way that a cell which is in shadow and not producing will act as a sink for the power produced by the other cells it’s wired to, with the result that virtually no power escapes from the panels as a whole.

You must have a regulator. The job of the regulator is to throw power away. It does this to ensure the power passing on to the batteries or services is not too great for them to handle. Normally it does this by controlling the amount of power passing through it and hold the output voltage at some predetermined value such as the float charge voltage of 13.4V.

The value of the power it passes depends on the current required by the load: the sum of batteries, lights, fridge and so on that are sucking the current from the panels. If the fridge is on, for example, more power will flow through the regulator and it will throw less power away as heat.

Most common, older regulators use a pulse width modulation (PWM) system which is more efficient than simply controlling the output voltage. Maximum power point tracking (MPPT) devices provide more usable power by seeking the panel’s optimum power voltage although they are expensive.

Chief among the suppliers is Victron (avoid the so-called MPPT types from ebay, they are almost certainly not MPPT controllers). And if you have the room it might be better to spend the money on a larger boat solar panel than on an MPPT controller. This is what we’ve done on our canal boat, settling for a PWM type.

To the boat solar panel, the regulator is part of the load – a consumer of power – which is why the entry to the regulator is an appropriate place to measure the voltage and current if you want to see exactly how much is being generated by the panels.

What power do I really get from boat solar panels?

If you do the sums, the unavoidable losses on a new panel operating at 65°C (measured in full summer sunlight in Greece) are going to be in excess of 20% from the temperature increase alone. Our example 100W panel is therefore only putting out 80W, and that’s only for a few hours.

If you really need every scrap of power then you need to find a way to keep the panel cool, and you need to invest in an MPPT regulator. As the panel gets older its performance will drop off even more. All a bit depressing, isn’t it?

I have to say, though, that in our particular installation on Aderyn Glas we regularly get more than 10A from our 200W panels, and our highest recorded value was 170W, which suggests that these loss figures are conservative.

In reality, with a well set-up installation you can expect to get a maximum of 75% of the power you would expect from a continuously insolated panel operating at its rated power.

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Adding Solar Power to a Sailboat

• By Emily Fagan
• Updated: October 18, 2019

During our nearly four-year cruise of Mexico, my husband, Mark, and I lived almost exclusively on 555 watts of solar power charging a 640-amp-hour house battery bank. We anchored out virtually every night aboard our 2008 Hunter 44DS, Groovy , and relied on the sun for power. During one 10-week stretch, while we waited for a replacement engine alternator to arrive, our boat’s solar panels were our sole source of power. We had no backup charging system to turn to, and yet we lived and sailed comfortably the entire time. Mounting solar panels on a sailboat was not difficult, but a few key decisions made a huge difference in how effective our panels were.

A solar-power installation on a sailboat is made up of two independent systems: one system to charge the batteries, and another system to provide 120-volt AC power for household appliances. In the charging system, the solar panels convert sunlight into electrical current and deliver it to the batteries via a solar charge controller. Similar to a voltage regulator, the charge controller acts as a gatekeeper to protect the batteries from receiving more current than they need as they are being charged. In the AC power system, an inverter or inverter/charger converts the 12-volt DC power in the battery into 120 volts AC whenever it is turned on.

Panel Positioning and Wiring Considerations

One of the biggest challenges for sailors installing solar power on a sailboat is finding a place on the boat where the panels will be shaded as little as possible. Just a few square inches of shade on one panel can render that panel all but inoperable. Unfortunately, between the mast, radome, spreaders and boom, shadows cross the deck all day long, especially as the boat swings back and forth at anchor.

What’s worse, if the panels are wired in series rather than in parallel, this little bit of shade can shut down the entire solar-panel array. When we installed solar power on Groovy , we had already lived exclusively on solar power in an RV for over two years. Our RV solar panels had been wired in series, and we had witnessed the array shutting down current production when just half of one panel was shaded.

Choosing whether to wire the panels in series or parallel on a boat affects the wire gauge required, which is why many solar-power installers lean toward wiring the panels in series. Panels wired in series can be wired all the way to the solar charge controller with a thinner-gauge wire than those wired in parallel. This is because the voltage of panels wired in series is additive, while the current remains constant, so the current flowing is just that of a single panel. In contrast, the current flowing from panels that are wired in parallel is additive, while the voltage across them is not. This means that in a parallel installation, the current going to the charge controller is several times higher and requires much thicker cable to avoid any voltage loss over the length of the wire.

Not only is thinner-gauge wire less expensive, but it is also more supple and easier to work with, making the job of snaking it in and around various crevices in the boat and connecting it to the solar charge controller much less of a struggle. Thus the choice between series and parallel wiring boils down to a trade-off between system performance, expense and ease of solar system installation.

Luckily, the size of the wire can be reduced if higher-­voltage solar panels are chosen. Since watts are determined by multiplying volts by amps, a higher-voltage panel that generates the same watts as a lower-voltage panel will produce less current. Therefore, selecting nominal 24-volt panels instead of 12-volt panels allows for the use of thinner wire sizes no matter how they are wired.

Our Marine Solar Panel Design Choices

In our installation, we decided to mount three 185-watt, 24-volt (nominal) Kyocera solar panels high above the cockpit, well aft of the boom, as far away as possible from potential shade. Our Hunter came with a big, solid stainless-steel arch, and we turned to Alejandro Ulloa, a brilliant metal fabricator at Baja Naval Boatyard in Ensenada, Mexico, to build a polished stainless-steel solar-panel arch extension onto the existing structure. He designed the arch extension with integrated telescoping davits to hoist our dinghy as well as support the solar panels. These davits were strong enough — and the lines and blocks had enough purchase — that either of us could lift our light Porta-Bote dinghy with its 6-horsepower outboard without a winch.

We spaced the panels about a half-inch apart and wired them in parallel. Using two twin-lead wires, we snaked the three positive leads and one common ground down through the inside of the arch tubes so they wouldn’t be visible, and placed wire loom over the exposed wires under the panels.

The junction points for the three parallel panels were on positive and negative bus bars inside a combiner box, all mounted in a cockpit lazarette. Inside the combiner box, we installed three breakers, one for each panel. This gave us the ability to shut off any or all of the panels if we needed to (we never did).

We mounted a Xantrex solar charge controller (model XW MPPT 60-150) in a hanging locker, as close to the batteries as possible, in a spot where it was easy to monitor and program. We ran twin-lead wire from the combiner box to the charge controller and from there to the batteries.

Our boat came with three new 12-volt Mastervolt 4D AGM house batteries, all wired in parallel, for a total of 480 amp-hours of capacity. We wanted a bigger house battery bank, and because it is best for the age, type and size of the batteries to be matched, we added a fourth new Mastervolt 4D AGM house battery, which brought our total to 640 amp-hours. Our batteries were installed at the lowest point in the hull, below the floorboards, and they ran the length of the saloon, from just forward of the companionway stairs to just aft of the V-berth stateroom door.

The best way to charge a bank of batteries that are wired in parallel is to span the entire battery bank with the leads coming from the charge controller. We did this by connecting the positive lead from the charge controller to the positive terminal of the first battery in the bank, and the negative lead from the charge controller to the negative terminal of the last battery. By spanning the entire bank, the batteries were charged equally rather than having the charging current focused on just the first battery in the bank.

We feel that AGM batteries are superior to wet cell (flooded) batteries because they can be installed in any orientation, don’t require maintenance, can’t spill (even in a capsize), and charge more quickly. Our Mastervolt batteries, like almost all AGM batteries on the market, are dual-purpose, combining the very different characteristics of both deep-cycle and start batteries. Our batteries work well, but if we were doing an installation from scratch today, we would consider the new Trojan Reliant AGM batteries. These batteries are engineered strictly for deep-cycle use and have been optimized to provide consistent current and maximize battery life.

Our boat came with a Xantrex Freedom 2,500-watt inverter/charger wired into the boat’s AC wiring system with a transfer switch. The inverter/charger performed two functions. While the boat was disconnected from shore power, it converted the batteries’ 12-volt DC power into 120-volt AC power, allowing us to operate 120-volt appliances, like our microwave. When the boat was connected to shore power, it charged the batteries.

Because this inverter/charger was a modified-sine-wave inverter, mimicking AC ­current with a stair-stepped square wave, we also had a 600-watt pure-sine-wave inverter to power our potentially more sensitive electronic devices. We chose Exeltech because its inverters produce an electrical signal that is clean enough to power medical equipment, and they are NASA’s choice for both the Russian and American sides of the International Space Station. For simplicity, rather than wiring the inverter into the cabin’s AC wiring, we plugged ordinary household power strips into the AC outlets on the inverter and plugged our appliances into the power strips. Like the charge controller, the inverter must be located as close to the batteries as possible. Ours was under a settee.

Shade’s Impact on Sailboat Solar Panels

Once our solar installation was completed on our sailboat, we closely observed the effects of shade on our solar-panel array. We were often anchored in an orientation that put the panels in full sun. Just as often, however, we were angled in such a way that shade from the mast and boom covered portions of our panels. It was fascinating to monitor the solar charge controller’s LCD display whenever the sun was forward of the beam — the current from the panels to the batteries fluctuated up and down as we swung at anchor.

Taking notes one morning, we noticed that the charging current was repeatedly creeping up and down between 9.5 and 24.5 amps as the boat moved to and fro. When the entire solar-panel array was in full sun, it generated 24.5 amps of current. When we moved so the mast shaded a portion of one panel, the array generated 15 amps. When it shaded portions of two panels and only one was in full sun, the array produced just 9.5 amps. Of course, it would have been preferable to see a steady 24.5 amps all morning, but this sure beat watching the current drop to zero whenever a shadow crossed a panel.

We discovered that shade makes a huge impact while sailing, too. Surprisingly, it is far worse to have the panels shaded by the sails than to have the panels in full sun but tilted away from its direct rays. One afternoon, we noticed that while we were on a tack that tilted the panels away from the sun, they generated 24.5 amps of current, whereas on a tack where the panels were tilted toward the sun but two of the three were partially shaded by the sails, the current dropped to a mere 10 amps.

Reflections On Our Solar Panel Installation

A wonderful and surprising side benefit of our large solar panels and arch system was that the setup created fabulous shade over the jumpseats at the stern end of the cockpit. Our metal fabricator, Alejandro, placed a support strut at hand-holding height, and sitting in those seats feels secure and comfortable while sailing, no matter the conditions.

After living on solar power for eight years of cruising and land-yacht travel, we’ve learned that you can never have too much solar power. Groovy’s 555 watts was enough to run all our household appliances as needed, including our nearly 4-cubic-foot DC refrigerator, two laptops, a TV/DVD player, and lights at night. However, it was not quite enough power to run all that plus our stand-alone 2.5-cubic-foot DC freezer during the short days and low sun angles of the winter months without supplemental charging from the engine alternator every few days. For the 10 weeks that we did not have a functioning alternator, our solution was to turn off the freezer, which enabled our batteries to reach full charge every afternoon.

Solar power made a world of difference in our cruise. Not only did it allow us to live comfortably and with ample electricity for weeks on end when our engine alternator went on the blink, but as a “set-it-and-forget-it” system, it also gave us the freedom to anchor out for as long as we wished without worrying about the batteries. In our eyes, the solar-panel arch enhanced the beauty and lines of our boat, giving her a sleek and clean appearance. It was true icing on the cake to discover that the panels and arch system also provided much-needed shade over the cockpit and helm from the hot tropical sunshine. If you are preparing for a cruise, consider turning to the sun for electricity and outfitting your sailboat with solar power.

The Installation:

Emily and Mark Fagan offer cruising tips and share their stories and photos on their website, roadslesstraveled.us . They are currently enjoying a land cruise across America aboard an RV.

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Yacht life’s new essential: arkpax unveils rugged ip67 solar generator, ensuring non-stop cruising.

For yacht owners and boating enthusiasts, power outages can quickly turn a luxurious cruise into a nightmare. But a new game-changing product is about to revolutionize how you stay charged on the high seas - the Arkpax 1800W IP67 Waterproof Solar Generator.

With an industry-leading IP67 rating, this rugged powerhouse is built to shrug off water and dust intrusion in even the harshest marine conditions. Its massive 1500Wh lithium battery capacity provides days of reliable energy to run your yacht's essentials like navigation, refrigerators, entertainment and more. Plus, the 1800W rated output ensures it can handle high-demand appliances with ease.

"I can truly go off-grid without worries now," said satisfied customer. "The 11 output ports give me options for running multiple devices, while the 500W solar input lets me recharge just from the sun's rays out of the ocean."

What really sets the Arkpax generator apart is its innovative technology. An MPPT controller optimizes solar charging, while the built-in UPS function prevents annoying power interruptions. And Arkpax's proprietary BMS 35 battery management system ensures safety and longevity - offering an exceptional 10-year lifespan.

When shore power is miles away, the Arkpax 1800W IP67 Waterproof Solar Generator keeps your yacht life powered indefinitely. Its 2-hour fast AC recharge time also means getting quickly topped up before setting sail again. For boating enthusiasts, it's becoming an essential piece of equipment to enable unrestricted cruising without compromise.

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Perovskite solar cells: A game-changer in renewable energy

Tandem cells: Boosting solar panel efficiency by over 50 percent

Researchers have made strides in the development of next-generation solar cells using perovskite semiconductors, paving the way for more cost-effective and efficient systems to power homes, cars, boats, and drones.

The solar energy landscape is on the cusp of a revolution, with researchers racing to create a new breed of solar cells that can convert electricity more efficiently than the current standard. Published in the journal Nature Energy on February 26, a new paper detailed an innovative method to manufacture these new solar cells, known as perovskite cells, marking a crucial milestone in the commercialization of what many consider the next generation of solar technology.

Conventionally, the majority of solar panels are constructed from silicon, boasting an efficiency of 22%. However, these panels can only convert approximately one-fifth of the sun's energy into electricity, as silicon absorbs only a limited proportion of sunlight's wavelengths, making the production process expensive and energy-intensive.

Perovskite, a synthetic semiconducting material, presents an alternative with the potential to substantially increase solar power conversion while reducing production costs. Michael McGehee, a professor in the Department of Chemical and Biological Engineering and fellow with CU Boulder's Renewable & Sustainable Energy Institute, expressed optimism about perovskite's potential, stating, "Perovskites might be a game changer."

The developments in perovskite solar cells represent a significant leap forward in the quest for more efficient and cost-effective solar technology, with the potential to revolutionize the renewable energy landscape and drive the transition towards a sustainable future.

One of the promising approaches in harnessing the potential of perovskite solar cells is by stacking them on top of traditional silicon cells to create tandem cells. This innovative method of layering the two materials, each absorbing a different part of the sun's spectrum, has the potential to increase the panels' efficiency by over 50%.

McGehee emphasized the urgency for improved solar cell efficiency, especially in light of the increasing electrification trend and the push for a fully renewable future. He noted, "If you believe that we're going to have a fully renewable future, then you're planning for the wind and solar markets to expand by at least five to ten-fold from where it is today."

However, a major challenge in commercializing perovskite solar cells lies in the process of coating the semiconductor onto the glass plates, the fundamental components of panels. Currently, the coating process necessitates a small box filled with non-reactive gas, such as nitrogen, to prevent the perovskites from reacting with oxygen, which diminishes their performance. McGehee highlighted the limitations of this approach, particularly as the scale of production increases.

In a significant breakthrough, McGehee and his collaborators discovered that adding dimethylammonium formate (DMAFo) to the perovskite solution before coating could prevent the materials from oxidizing, enabling the coating to take place outside the confined environment of a nitrogen-filled box, in ambient air. Experiments revealed that perovskite cells made with the DMAFo additive could achieve an efficiency of nearly 25% on their own, comparable to the current efficiency record for perovskite cells of 26%. Furthermore, the additive improved the cells' stability, a critical factor for long-term performance.

While these findings are indeed promising, McGehee cautioned that longer tests are essential to assess the cells' durability over time. He underscored the need for extended testing to determine if perovskite cells can match the stability of silicon panels, which typically maintain at least 80% of their performance after 25 years.

The study represents a significant step forward in the commercialization of perovskite solar cells, with McGehee's team concurrently working on developing tandem cells with a real-world efficiency of over 30% that can match the operational lifetime of silicon panels. Through the Tandems for Efficient and Advanced Modules using Ultrastable Perovskites (TEAMUP) initiative, a U.S. academic-industry partnership led by McGehee, researchers are striving to create stable tandem perovskites that are commercially viable and can potentially surpass the efficiency of conventional silicon panels while maintaining long-term stability.

With higher efficiency and potentially lower price tags, these tandem cells could find broader applications than existing silicon panels, including potential installation on the roofs of electric vehicles, thereby extending their range by 15 to 25 miles per day under sunlight exposure. The implications also extend to the potential use of such panels in powering drones and sailboats, presenting a significant advancement in sustainable energy solutions.

After a decade of research in perovskites, McGehee expressed confidence in the potential of perovskite cells, stating, "We are taking perovskites to the finish line. If tandems work out well, they certainly have the potential to dominate the market and become the next generation of solar cells."

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