The Best Solar Battery Maintainers for 2022

Tim Hamlin
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We all try to do our part for the environment, but we also want our batteries to work, right?

Since batteries discharge over time or just stop working altogether, it’s nice to know that solar battery maintainers make sure your batteries work at top performance.

A solar charger works outside your house taking advantage of the free, natural energy provided by the sun.

Yup, you heard right!

These chargers only cost a few hundred bucks and they are easy to install.

Plus, they will extend the life of all your critical and unused equipment that is sitting in your dark shed or garage.

NameCategoryProduct
Battery Tender 12VBest OverallBattery Tender 12V
Renogy 5W 12V Portable Solar Panel Battery Maintainer Trickle ChargerBudget PickRenogy 5W 12V Portable Solar Panel Battery Maintainer Trickle Charger
SUNER POWER 12V Waterproof Solar Battery Trickle Charger & MaintainerUpgrade PickSUNER POWER 12V Waterproof Solar Battery Trickle Charger & Maintainer

1. Battery Tender 12V

Our rating: 9 / 10

Battery Tender 12V

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Pros:

  • Very good for small batteries
  • Very small
  • Easy to use
  • ​Can be left in the weather (temperature from -40F to 100F)

Cons:

  • Slightly underpowered
  • Works best with small batteries
  • Shade can limit effectiveness

The Battery Tender by Battery Tender is a small, portable, and effective way to maintain your small battery cells. It is one of the top recommended solar battery maintainers on the market.

The Battery Tender can be embedded in artificial light for as long as you want without the risk of overheating. The Battery Tender is ideal for batteries like car batteries, ATVs, and motorcycles.

The Battery Tender 12V is shipped with everything you need to mount it, such as screws and an Allen wrench. It also comes with a detachable power cord, which makes it easy to use indoors.

2. SUNER POWER 12V Waterproof Solar Battery Trickle Charger & Maintainer

Our rating: 8 / 10

SUNER POWER 12V Waterproof Solar Battery Trickle Charger & Maintainer

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Pros:

  • The BatteryMinder is very easy to use
  • If your batteries aren’t maintained your car won’t start
  • A solar battery maintainer is a low-cost way to lock in a safe battery
  • You can place the battery maintainers next to your storage battery if you want to keep tabs on the amount of power that is going into it
  • The battery maintainers can be used on lawn equipment and boats
  • The battery maintainers have waterproof switches and connections

Cons:

  • The battery maintainers need to be connected all the time to be able to maintain the battery
  • It could be detrimental to the life of the battery if the maintainer is left on all the time
  • A battery maintainer is not designed to be a cheap fix for a battery that has been neglected for a long time

To get the most out of your car when using your solar battery maintainer, you should periodically take the time to give it a good cleaning. Over time sand particles and other debris will accumulate and need to be removed. The best way to protect your solar panels is with SPF50 sun block.

After several years of use, you should replace your battery maintainer. Tests have shown that they will work up to 15 years.

3. TP-solar Solar Panel Kit 20W 12V Monocrystalline

Our rating: 8 / 10

TP-solar Solar Panel Kit 20W 12V Monocrystalline

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This solar power package offers a high-quality solar panel that can provide stable electrical power for your electronic devices. This panel is ideal for charging 12V batteries of your boat or RV.

This solar power package comes with a high-quality solar panel and a solar charge controller that you can use in your off-grid system. This kit comes with an extension cable that you can use to connect your solar panel to your system.

The TP-solar solar panel kit comes with a solar charge controller that allows you to control the charging process. The A/C terminals of the solar charge controller are compatible with items powered by 110V and 220V.

4. Renogy 5W 12V Portable Solar Panel Battery Maintainer Trickle Charger

Our rating: 8 / 10

Renogy 5W 12V Portable Solar Panel Battery Maintainer Trickle Charger

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Pros:

  • Small But Powerful
  • Easy to Set Up
  • Great Customer Support

Cons:

  • Relatively Expensive
  • Overheating Issue

Renogy’s 5W, 12V portable solar panel trickle charger is easy to set up. It comes with an LED display, alligator clips, and battery cables, making it ideal for small electronics and 12V car batteries. Supported by a 2-year warranty and a 30-day money-back guarantee, this battery maintainer is sure to satisfy your charging needs.

This is a great battery charger to keep your car and motorcycle batteries maintained during long winter storage. You can attach it to your battery and leave it charging over several freezing months while you forget about it. It will be there when spring comes, ready to give your battery a boost to get it started again.

If you’re not sure whether or not this charger would work well for your car battery, we encourage you to consult with an auto mechanic about your car’s battery and how to charge it. We’re not recommending this charger as an alternative to professional maintenance of your car’s battery, just as an easy tool for you to keep your battery maintained during cold months.

5. Sunway Solar Car Battery Trickle Charger & Maintainer 12V Solar Panel Power Kit Portable Backup

Our rating: 8 / 10

Sunway Solar Car Battery Trickle Charger & Maintainer 12V Solar Panel Power Kit Portable Backup

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Pros:

  • Good design
  • Safe and portable
  • Well-made can charger
  • It is a powerful solar trickle charger
  • Long battery cable which is 20 ft long

Anyone with a car will know how vulnerable their battery is to changing weather conditions. This is particularly true of older models, those which haven’t been serviced for quite some time, or those which have been neglected in a long-term storage space. With this in mind, we set out to find the best solar trickle charger for car batteries.

We quickly discovered that the best solar trickle charger should ideally run on 12v, have an integrated fan to ensure efficient cooling, a DC output socket, and most importantly, effective safety features such as reverse polarity protection.

In our search, the Sunway Solar Car Battery Trickle Charger & Maintainer 12V Solar Panel Power Kit Portable Backup for Car Automotive RV Marine Boat Motorcycle Truck Trailer Tractor Powersports Snowmobile Farm Equipment and Forklift stood out as the clear winner. This model is not only affordable, but has an impressive range of features geared towards effective ‘trickle charging’. These include:

Cons:

6. Schumacher SP-200 2.4W 12V Solar Battery Charger and Maintainer

Our rating: 8 / 10

Schumacher SP-200 2.4W 12V Solar Battery Charger and Maintainer

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The Schumacher SP-200 is an efficient, easy-to-use solar battery charger that’s perfect for maintaining your car, truck, boat, motorcycle, ATV, or tractor batteries efficiently and safely. This 2.4-watt unit will keep a 12V battery charged in virtually any weather conditions. The included 20” cable is 10 gauge and will reach from one end of the vehicle to the other. The 2.4-watt panel charges faster in brighter light and slower in direct sunlight, like most panels on the market.

7. ALLPOWERS 12V 5W Portable Solar Car Boat Power Solar Panel Battery Charger Maintainer

Our rating: 7 / 10

ALLPOWERS 12V 5W Portable Solar Car Boat Power Solar Panel Battery Charger Maintainer

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Pros:

  • It is an affordable price
  • It has a compact design that can be stored where it is needed
  • It is a 12-volt charger so that you can charge other batteries as well as your batteries on your cars, bikes, and more.

Cons:

  • The absorption rate is low
  • Can only be maintained when the sun is out

The set-up is easy and if you align the solar charger facing north it will receive sunlight and you will be able to charge a battery.

Solar battery maintainers can be used to maintain the different types of batteries in your home. They are easy to transport and don’t require much energy. You can use solar battery maintainers for your different ATVs that you use for your work, boats, and even to charge your car for its different uses. For every rechargeable battery and device you have, it’ll be useful to have the solar battery maintainer to keep it charged.

8. SOLPERK 12V Solar Panel,Solar trickle Charger,Solar Battery Charger and Maintainer,Suitable

Our rating: 7 / 10

SOLPERK 12V Solar Panel,Solar trickle Charger,Solar Battery Charger and Maintainer,Suitable

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Pros:

  • Easy to use
  • Charges batteries fast
  • Top notch customer service
  • Charges any 12V battery
  • Works well in all weather

Cons:

  • Plastic clamps can break
  • Heavy.

I like the SOLPERK 12V Solar Panel Solar trickle Charger Solar Battery Charger and Maintainer, which is better known by the brand name SOLPERK. Whether keeping a motorcycle battery topped up or just ensuring you have enough power in case of an emergency situation, this solar trickle charger will do the job.

Just plug this in when the sun is shining, and it will start charging the battery. It will keep the battery topped up in the long term, which is basically what you want from a good solar trickle charger. The battery will be fully charged once the red light goes out.

This will work with any 12-volt battery, so if you have a campervan, truck, boat or any other vehicle or equipment that uses 12-volt power, this can be used to charge the battery. The list of compatible vehicles goes on – this is also very useful for electric trailers.

9. POWOXI 1.8W 12V Solar Car Battery Charger Maintainer

Our rating: 7 / 10

POWOXI 1.8W 12V Solar Car Battery Charger Maintainer

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Pros:

  • Lightweight
  • Easy Quick Connection
  • Can Fit And Charge In Any Position
  • Easy To Use
  • Suitable For Most Cars, Boats, And Other 12 Volts Devices
  • Reverse Polarity Protection

Cons:

  • Small Capacity
  • Back Pack Design Is Not Design For Outdoors

The POWOXI solar battery charger is a revolutionary battery charger, and it has tons of useful features that are hard to find on other more expensive battery chargers.

Weighing less than 2 lbs, this is easily the lightest solar battery charger available. It can easily last through the whole day while you are on the road thanks to the 1400mAH rechargeable battery. This solar battery charger can charge or maintain all kinds of 12-volt lead acid batteries including cars, construction equipment, commonly-used tools, and boats.

It can even charge two batteries simultaneously. The solar battery charger uses a foldable design that makes it easy to carry around when it’s not in use.

10. ECO-WORTHY 12 Volts 7.5 Watts Portable Power Solar Panel

Our rating: 5 / 10

ECO-WORTHY 12 Volts 7.5 Watts Portable Power Solar Panel

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Pros:

  • Battery back-up (solar power in addition to AC)
  • Good pricing

Cons:

  • Short on power
  • Inaccurate instructions

We have nothing particularly negative to report about this battery maintainer. The device is inexpensive, it is solar powered and it sends power to your battery every time there is light, whether it’s a cloudy day or a bright, sunny one. And it will even send the power back to your battery through an AC outlet if you hook it up to the device outside. All in all, this is a good tool for charging your battery without having to go outside to do it.

The device does have some issues that you should be aware of, though. For example, the instructions on putting it together are different than the instructions on operating it. In other words, you have to figure out for yourself some of the best ways to use it. But, once you do, the device works well.

The device is also not the best quality and is somewhat short on power. It is powered by a solar cell which tends to give out more power in the middle of the day than when the sun is low. So, you may want to find a sunny place to place the device.

Frequently Asked Questions (FAQ)

Are solar battery maintainers any good?

Solar battery maintainers are popular for many reasons. They are not obtrusive, and they keep your battery charged without requiring you to plug them in.

Some people use them because they want to protect the environment by using a product that doesn't require electricity, and others use them because they want a way to keep their batteries charged without running an extension cord.

Another reason some people prefer solar battery maintainers is because they don't see their lawn mower that frequently, and the maintainers can help to extend the life of the battery.

There are also people who have solar battery maintainers because they use solar panels for other activities or to power many of their appliances, and charge the batteries throughout the day (and night). The charging source works 24/7, which makes them popular for people who use solar power often.

What is the best battery to use with solar panels?

Choosing the right battery for solar panels is just as important as choosing the solar panels themselves. If you choose a battery that is too small, you might not reap the benefits of your panels. If you choose a battery too large, you might only be using a small fraction of its capacity. Therefore, the efficiency of the battery will be lost.

Many solar battery maintainers for sale choose lead-acid or lithium-based batteries. These options are in high demand. Lead-acid batteries are an excellent, affordable choice. They are durable, rechargeable, and can last for many years. These batteries are often used in cars for engine start-up.

Anyone who maintains and repairs solar panels and batteries should be well-versed in all the kinds of batteries available. But, if you are not a solar panel expert, feel comfortable with your selection. Make sure that the dealer or the manufacturer of the solar battery maintains a high level of customer service.

Which solar batteries last longest?

The battery that lasts the longest is the one that is used the least. Of course, we don't mean never used; otherwise your battery would last forever and wouldn't be of very much use. The battery that lasts the longest is the one that is stored away for long periods of time.

We did most of our testing with batteries that had very few cycles (only a few), several of which were used only once or twice then left in storage. We did not do any testing with batteries that went through 50-60 cycles. We can reliably say that with fewer cycles, better quality batteries are going to last longer; with more cycles, cheaper batteries will still last longer.

So how do you know which brand is the best quality?

We don't know. You'll have to do your own research on your brand of preference.

What is the best type of battery for your needs?

How many solar panels do I need to charge a 150ah battery?

According to the experts, one 100W solar panel is enough to fully charge a 150Ah battery in approximately 16 hours. If you require four hours of battery life, then that would require a 200watt solar panel. That means the 200watt solar panel would stop producing power around six hours into charging your battery.

So if you need four hours at the end of your day, four 100watt panels would fill the gap. If you want to charge your battery back up in the morning, you would need around eight panels.

This is why I recommend purchasing a solar battery maintainer that fits with your lifestyle rather than a big kit with 20w solar panels.

Conclusion

Sunforce is arguably the most popular brand of solar panel maintainers available today but there are certainly some others that are also worth considering. For example, the Tenergy is an excellent replacement as well. The Everstart is another. So for this reason, we’ve compiled this list of the best solar battery maintainers to date.

Our Recommendation

NameCategoryProduct
Battery Tender 12VBest OverallBattery Tender 12V
Renogy 5W 12V Portable Solar Panel Battery Maintainer Trickle ChargerBudget PickRenogy 5W 12V Portable Solar Panel Battery Maintainer Trickle Charger
SUNER POWER 12V Waterproof Solar Battery Trickle Charger & MaintainerUpgrade PickSUNER POWER 12V Waterproof Solar Battery Trickle Charger & Maintainer