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Shining a Light on the 8 Best Marine Solar Panels
The late great Lou Reed once sang that electricity came from other planets. And he wasn't far wrong, as electricity comes from the sun by the magic of solar power.
The best marine solar panels for boats free you to travel the seas, safe in the knowledge that as long as the sun shines, there's an endless supply of energy. I speak from experience, having fitted 600 watts of solar panels to my canal barge.
It means that for almost eight or nine months of the year, barring really overcast days, I can get all the power I need to liveaboard without the need to run my engine. The ocean is one place where you can guarantee no obstructions from the sun, so it's no wonder that solar power is a top energy choice for sailors.
Why Get Solar Panels?
In the world are two types of boaters: the liveaboard boater and the weekend or holiday leisure boater. Both will benefit from solar but in different ways.
Liveaboard
The energy requirements for a liveaboard boater are vastly different from a leisure boater. Managing daily energy consumption is a skill, and having solar means that you worry a little bit less about your batteries.
For a liveaboard boat, the best marine solar panels will be more substantial, probably a minimum of 100 watts. Most liveaboard boats run with two or three panels, giving them a maximum of 300 watts.
That's more than enough power to run a fridge, onboard equipment and laptops while in the middle of the ocean.
Leisure
For leisure boaters, their energy requirements are far less crucial. Sure, they want the same benefits, primarily, but there's no demand for constant solar because the vessel gets used on an ad-hoc basis.
It means that there's less need to fill the roof of the boat with masses of panels, unlike the liveaboard vessel.
Care and Maintenance
Solar panels are as easy to clean as your windows. Simply use a hose and nozzle to rinse away dirt and grime and then wipe with a squeegee. If there's a buildup of debris, use a soft scrub brush and a cleanser such as boat soap to gently scrub.
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Different Types of Marine Solar Panels
Okay, so you've thought long and hard and have reached the momentous decision to get solar panels. But what are your options? Let's review your solar power choices for boats.
Flexible Solar Panels
Flexible panels are great because they adapt to whatever surface you wish to attach them. They flex, which means you can attach them to surfaces that are not perfectly smooth or flat.
Given the unusual shapes and angles you find on ocean-going boats, this is an advantage.
Also, these types of panels are more robust, meaning they should easily stand up to the rigors of daily sailing life.
Advantages of Flexible Solar Panels
- Fit to most surface shapes
- Don't need large amounts of space
- Ideal for sea-travel
- More robust
- Fixed location means they cannot adapt to the conditions
- Cannot be angled for better efficiency
- Lower percentage conversion of sunlight to electricity
Fixed Solar Panels
Fixed solar panels are often attached to mounts that allow you to swivel and adjust the panel's angle toward the sun. This process generates more energy than the flexible panels would because all they do is sit in a fixed position, relying on the sun's rays hitting the panel.
Solar will indeed operate in average daylight, but if you want the best performance, consider angling the panels.
Generally, fixed panels are more expensive to buy and need more significant maintenance and care. They aren't as robust as their flexible counterparts and are also more awkward to mount.
Advantages of Fixed Solar Panels
- Can be angled to increase efficiency
- Higher percentage efficiency of sunlight to electricity
- Need fewer panels
- Can be mounted to most surfaces
- Generally more expensive than flexible panels
- Need more maintenance and care
- Less robust
Monocrystalline Solar Panels
A silicone crystal "seed" is placed in a vat of molten silicon and slowly drawn upwards, as the silicon clings to the surface of the seed. Imagine a snowball gathering snow as it rolls, and you'll understand.
This process forms an ingot, which is removed from the vat and left to cool. It's then sliced into wafer-thin pieces to develop the cells. It's an incredibly wasteful process, as most of the silicon gets discarded.
The advantage of a monocrystalline panel is that they're the most efficient variety, with some of the latest panels converting 22% of sunlight into electricity.
Because of their high productivity, they're also space-efficient. Fewer panels are needed, making them ideal for the limited roof space on boats.
They also have a longer lifespan, which is why manufacturers place 25-year guarantees on them. They perform better in warmer weather, so if you're sailing around the sunnier climes, these panels would be ideal.
Advantages of Monocrystalline Solar Panels
- Most efficient of all the solar panels
- Higher productivity means fewer panels to mount
- Typically have a 25-year guarantee
- Perform better in warmer climates
- Wasteful manufacturing process
- Generally more expensive to buy
- Less robust than other solar panels
Polycrystalline Solar Panels
The manufacturing process for producing polycrystalline panels is very similar to the monocrystalline versions. A crystal silicone "seed" is immersed into a vat of molten silicon and starts to form an ingot.
Unlike the previous method of drawing the silicone to the surface and removing it from the container to cool, creating polycrystalline cells, the molten silicone is allowed to cool with the silicone "seed" in situ.
Thought to be slightly less efficient than the monocrystalline versions, polycrystalline panels are cheaper to produce, making them the recent panel of choice. They also create less waste, which is better for the environment, and have a lower heat tolerance than monocrystalline panels.
Advantages of Polycrystalline Solar Panels
- Cheaper to produce
- Less wasteful construction process than monocrystalline panels
- More affordable
- Better in colder climates
- Not as efficient as other solar panels
- Less effective in warmer weather
Thin Film Solar Panels
Thin film panels are produced by placing a photovoltaic substance like amorphous silicon or cadmium telluride onto a solid surface like glass to form the cells.
It produces less waste than traditional solar panel construction, and the cost savings is passed on to the consumer, meaning this is the cheapest option for those on a budget.
They also perform better in low-light and in cloudier days, whereas mono and poly panels will still work in those conditions, but need direct sunlight to reach their maximum performance.
The disadvantage of these panels is their efficiency when compared to monocrystalline panels, which have four times the performance. That means you're going to need more panels and more space to produce the same energy.
Plus, they degrade faster than the other two varieties, meaning that they come with shorter warranties.
Advantages of Thin Film Solar Panels
- Cheapest of all the panel varieties
- Perform better in low-light conditions
- The least wasteful manufacturing process
- Can be adapted to be flexible
- Four times less efficient than monocrystalline panels
- Takes up greater roof space
- Degrade faster so have shorter guarantees
What About Marine Solar Panel Wattage?
The most common solar panels are 100-watt varieties, but you can opt for more powerful ones.
At the other end of the wattage spectrum, you can find panels that generate 20 or 30 watts. These smaller panels are excellent for charging smaller electrical items like phones and laptops while you're on the move, but you would need higher capacity if you're a liveaboard boater, or you're embarking on an arduous journey across the ocean.
Solar panels typically come in wattage sizes of 30W, 50W, 100W, 150W, 200W and 300W. But as previously mentioned, for larger vessels, opting for two 300-watt panels might be the best option.
Combined, they'll still generate 600 watts and take up less room than three or four smaller panels.
Shining a Light on the 8 Best Marine Solar Panels
Monocrystalline Marine Solar Panels
1. Renogy Monocrystalline 100-Watt Panel
Long-lasting and robust, this Renogy panel has an efficiency rating of 18.4%. Designed with boats and RVs in mind, they shouldn't take up too much roof space.
2. Newpowa 100-Watt Monocrystalline Panel
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This Newpowa monocrystalline panel offers a 25-year transferrable warranty against a drop in power output.
3. Renogy 100-Watt Monocrystalline Flexible Panel
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These panels are incredibly flexible and lightweight and come in 50W, 100W and 160W sizes. They're perfect for boats with a flat roof section.
4. WindyNation 100-Watt Monocrystalline Flexible Panel
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Like the Renogy flexible panel, this Windy Nation product weighs just 4 lbs and has a flexing ratio of 30 degrees, so getting it to fit the contours of your boat should be easy.
Polycrystalline Marine Solar Panels
5. HQST 150-Watt Polycrystalline Solar Panel
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This is the first polycrystalline product to feature, and it's also the most powerful panel so far at 150W. Plus, when you compare the price of this panel to the Renogy monocrystalline model, there's considerable savings to be made.
6. RichSolar 100-Watt Polycrystalline Panel
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This polycrystalline panel has a junction box with an IP rating of 65, along with an IP 67 rating for its MC4 connectors. This means that even the harshest conditions at sea won't affect their performance!
7. Newpowa 50-Watt Polycrystalline panel
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At 50 watts, this panel is better suited for smaller craft or for requirements that mean you need less power like running GPS equipment or laptops.
8. Renogy 160-Watt Polycrystalline Panel
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This Renogy panel is robust and can withstand high winds, so that's one less thing to worry about in the middle of the ocean. It also has a reinforced surface that's able to withstand high impacts, so again, that rogue wave should slide right over this panel, causing no damage.
Marine Solar Panels Offer Freedom
Whether you're sailing seas on an epic adventure or sticking to lakes and rivers, solar power is cleaner. You don't have to run your engine to top up the batteries, and it's a lot cheaper in the long run because you save on the ongoing costs of burning fuel that could be avoided.
Whatever style or type of solar panel you choose, having energy created from the sun's rays is incredible. It gives you freedom from power woes like nothing else.
Depending on your location and climate, other off-grid options such as marine turbine generators could be a better option. But they're cumbersome and only work when the wind blows.
In my opinion, marine solar panels for boats provide the best green renewable energy, and if you aren't taking advantage of it, then you should be.