12 Volt 10 Watt Solar Car Battery Charger & Maintainer, Solar Panel Trickle…

SOLVAO 7.5W Solar Trickle Charger Battery Maintainer

If not used regularly, batteries naturally drain power and if allowed to go flat, may never regain their full power. This solar powered battery maintainer helps manage battery drain in all seasons. The solar charger converts light energy from the sun into 12 volt DC electricity, which is then transported to batteries through a wire and your connector of choice.

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Includes Our Premium Quality Guarantee w/ 1 Year Warranty

If not used regularly, batteries naturally drain power and if allowed to go flat, may never regain their full power. This solar powered battery maintainer helps manage battery drain in all seasons. The solar charger converts light energy from the sun into 12 volt DC electricity, which is then transported to batteries through a wire and your connector of choice.

Keep Your 12v Battery Charged Year-Round

Use for any rechargeable 12 volt battery and a variety of off grid applications, even in in cloudy conditions and other inclimate weather!

Our 7.5 watt solar powered trickle charger can be used for any rechargeable 12 volt battery and a variety of off grid applications! Perfect for automobiles, boats, motorcycles, RVs, motorhomes, marine, tractor, powersports, trucks, snowmobiles, golf carts, sheds, cabins, gate openers, and any other automotive or 12V battery applications. Prevents your battery from dying if not in use for an extended time.

Plug and Play Connectivity with High Efficiency Solar Panel Blocking Diode to Prevent Overcharging

Easily installed. just plug in the solar panel, set it and forget it! No technical knowledge needed.

Great for grandparents or vehicle owners who don’t use their cars or auto mobile every day! Just set it up on the dashboard and let it charge your battery. Has a built-in blocking diode for reverse protection, which means the regulator will control the amount of power it sends and won’t damage or over charge your 12volt batteries.

  • Solar energy keeps 12v batteries alive in all seasons
  • High efficiency amorphous solar panel
  • Built-in diode to prevent reverse charging overcharging
  • Quick easy plug-and-play functionality
  • Strong, durable ABS frame
  • Low maintenance, portable and lightweight
  • 2 different charging methods available via alligator battery clamps DC plug

Charge Any 12 volt Battery with the Power of the Sun

Because our solar trickle charger is also a maintainer, it safely charges and maintains Wet, Gel, SLA, AGM and Deep Cycle batteries, etc using solar energy. Great to keep handy for emergency preparedness, keeping backup batteries charged, camping, motorhomes and even tents that are powered.

Setup and installation takes just minutes! This product works right out of the box and can be used on day 1.

Please fully read the included instruction manual prior to use.

If you experience damaged product(s), defects, or issues of any kind, please reach out to our support team immediately. we are happy to help and will address any issues immediately!

This is an awesome solar charger. I’ve used it a few times on my RV battery and it’s done a great jobDennis Burrill

SOLVAO 7.5W Solar Trickle Charger Battery Maintainer

What Are People Saying About This Solar Battery Charger?

I had been looking for an inexpensive solar charger to keep my RV battery charged. This was the perfect answer. 7.5 watt trickle charge is perfect for when my RV is not being used. Plug and play feature makes for easy setup and teardown. Would recommend.

The length of the cord makes it adaptable to different situations. I use it in my shed with the panel on the side wall. It’s very easy to plug in and out when needed. Works great keeping the battery strong Michael W.

“This is a great little unit to keep your vehicle go-ready, especially in extreme heat or cold, when batteries tend to fail. Easy to use, no extra power source required. So cool!”

“I get these for my RVs (I build them Out of school buses). This one is mounted on my roof and works great so far. Better than the flexible panels for a more permanent answer.”

SBC750 Solar Battery Maintainer FAQs

No, this unit does not require a solar controller. There is a built-in diode to prevent over-charging.

This charger is not meant to fully charge 12v batteries, but to keep them topped off so they don’t die when not in use.

What output connections are available? if i have an electric generator with a dc, 8mm connector can i use these panels to recharge it? adapter?

This solar trickle charger includes a built-in cord measuring 8 feet, 8 inches with an SAE connector at the end. The following 2 adapters come with the unit for different applications: 1 x alligator clips for 12v battery, 1 x 12v cigarette lighter adapter.

Is there a longer cord available for the charger so the panel can be further from the battery so I can put it in a better position to get the sunlight?

At this time, we don’t offer separate cord for the solar trickle charger ​but we do plan on adding that in the future.

Full Product Description Specs

Please fully read the included instruction manual prior to use.

If you experience damaged product(s), defects, or issues of any kind, please reach out to our support team immediately. we are happy to help and will address any issues immediately!

If not used regularly, batteries naturally drain power and if allowed to go flat, may never regain their full power. This solar powered battery maintainer helps manage battery drain in all seasons. The solar charger converts light energy from the sun into 12 volt DC electricity, which is then transported to batteries through a wire and your connector of choice.

A reverse blocking diode inside the unit ensures the charger will not damage or over-charge your battery. Please note, this charger is designed to send a slow, steady charge to the battery and is not designed to fully charge any battery.

  • Maximum Power: Up to 7.5 watts
  • Current at Pmax: 400mA
  • Voltage at Pmax: 18v
  • Solar Panel Type: Amorphous
  • Measurements: 13 3/10 x 13 3/10 x 7/10
  • Weight: 2.73 lbs
  • Solar energy keeps 12v batteries alive in all seasons
  • High effeciency amourphous solar panel
  • Built-in diode to prevent reverse charging overcharging
  • Quick easy plug-and-play functionality
  • Strong, durable ABS frame
  • High quality glass covers the solar panel
  • Low maintenace, portable and lightweight
  • 2 different charging methods available via alligator battery clamps DC plug
  • 1 x Solar Panel w/ 8 ft. 8 in. SAE connector cord
  • 1 x Battery Clamps (approx 2 ft. with cord)
  • 1 x DC Plug (approx 2 ft. with cord)
  • 4 x Mounting Screws

Volt 10 Watt Solar Car Battery Charger Maintainer, Solar Panel Trickle Charger with Alligator Clip Adapter for Car, Boat, Automotive, Motorcycle, RV

A Recent Customer Review:My order arrived promptly, neatly packaged, looking exactly as pictured. I received a note from the company before I received my order, thanking me for my business another upon receipt, to make sure everything arrived as I expected. I appreciate this fine customer service highly recommend this company Customer: J. Glenn

  • Batteries Naturally Discharge. Automotive batteries naturally discharge when not in use.
  • Vehicles have a small but constant battery drain. Modern vehicles have upwards of 30 body control modules (computers), alarm systems, immobilizers and lock monitoring. These units all consume electricity from the battery. That’s why in a week or two with no or little vehicle use the battery can become discharged.
  • Battery life is shortened if it is not kept charged. A 12V battery that is not correctly maintained above 12.4V can suffer from sulphation. Sulphation is the main cause of battery failure. That’s why the auto battery easy goes to dead when vehicles are left standing for long periods.

Solar Car Battery Trickle Charger Package Includes:

  • 1 12V 10W Solar trickle charger with 4.75 ft cord
  • 1 Alligator clip adapter with 22.8 inch cord
  • 1 Cigarette lighter adapter with 22.8 inch cord
  • 4 PVC Suckers

12 Volts 10 Watts Portable Solar Panel Battery Maintainer

Short circuit current (Isc): 0.61A

Plug Play SAE connector

Solar Panel SAE connector is plug and play, no need to recognize positive or negative, simple and easy to use.

Note :As this is 10w solar panel main function is maintain battery, not for full charging your battery

Cigarette Lighter

Plug the cigarette lighter to socket when use it to charge or maintain vehicle’s battery, really plug and play.

Note: In some makes of vehicles, the cigarette lighter may not operate when the ignition is turned off. If so, you can connect directly to the battery using alligator battery clamps and cables.

Alligator Clip Adapter

Use the red and black battery clamps to trickle charge and maintain 12 V battery, make sure they connect correctly.

Built-in blocking diode

Built-in blocking diode to prevent reverse discharge.

this solar power panel on your windshield with the suction cups or fix it on the sun visor with the back strips.

  • 10W 12V Solar Car Battery Charger is the perfect trickle charger/maintainer for 12V batteries of cars, motorcycles, boats, snowmobiles, tractors etc
  • It can be placed for a long time to maintain the battery without disconnecting.Since it will not overcharge the battery and it has built-in diode to prevent reverse current at night.
  • Daily maintenance for 12V batteries,suitable for vehicles in outdoor work or travel or camping training. Easy to install and completely maintenance-free
  • Comes with the cigarette lighter adapter, 1 pair of battery clips and 4pcs PVC suckers. Unique design-high quality clips to prevent short circuit
  • Environmental protection and energy saving, built-in blocking diode to prevent reverse discharge, not only maintains the battery lifetime but also extends its usage life

.4W Solar Battery Maintainer

2.4 W SOLAR BATTERY MAINTAINER Charges 12V lead-acid batteries Extends battery life Works in cloudy conditions Water-resistant Environmentally safe Minimal maintenance Ideal for boats, cars, motorcycles, snowmobiles, trucks, RVs and more Contents: (1) Schumacher SP-200 solar panel (1) 12V DC adaptor (1) clamp adaptor (4) mounting screws (1) owner’s manual

Product Manuals/Tutorials

These manual(s) will explain how to use the product safely and effectively.

volt, watt, solar, battery, charger


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The 8 best solar battery chargers for your car, phone, boat, RV, and more!

Many of the devices that we depend on throughout the day run on batteries and it’s never fun when those batteries run down. A solar battery charger is an easy, earth-friendly way to keep all your batteries juiced up and ready to go. The beauty of a solar battery charger is that they work anywhere where you can find sunshine, no outlets required! In most cases, all you have to do is put the solar panel in the sun and connect your battery. It’s that easy.

A solar battery charger will include a solar panel, as well as wires to connect the solar panel to your battery or device. Some kits also include a few tech items like charge controllers and blocking diodes (more on those later).

Before we move on, here’s something important that you should know. Most 12-volt solar chargers are designed to maintain your battery’s charge when it’s not in use. These small solar chargers aren’t big enough to fully charge dead batteries, they trickle charge them instead. This ensures that the battery is always ready for your next adventure.

Solar chargers for smartphones and tablets, however, produce the 5-volts your iPhone needs to recharge after a complete discharge.

Needless to say, solar chargers for vehicles and smartphones are different and not typically interchangeable. We chose a variety of chargers so that you can get a good idea of what’s available.

We searched through hundreds of options and narrowed our list to eight products in eight different categories. All the solar chargers we’ve included are cost-competitive, durable, and backed up with great customer service.

Of course, some are more expensive than others, but if they are, we’ve laid out exactly why you’d want to spend that extra cash. After taking a look at these sweet products, we think you’ll agree!

Solar Battery Charger Reviews

Read on to learn more about each of the best solar charger companies on our list to find the perfect one for your battery or devices.

Best Solar Battery Charger for Cars

Quick Look: A physically large, waterproof solar charger that comes in three sizes, from 5W to 15W, built-in controller, and diode.

If you’re looking for a well-built, leave-it-and-forget it solar battery maintainer for your car, Battery Tender’s Solar Charger is the perfect solution. It is heavy-duty, waterproof, and comes with everything you need to keep your battery topped up with free, clean energy.

Battery Tender has been around for ages and you can find their products online and in stores like Walmart and auto parts stores. On Amazon, you can find their Solar Charger in 5W, 10W, and 15W. Each comes with alligator clips to easily attach to your battery.

It’s waterproof, so you can leave it outside, but remember it’s quite large – the 15W panel is over 3 feet long and a foot wide. However, it’s got some great features that set it apart from almost every other solar battery maintainer out there.

First, Battery Tender’s Solar Charger includes a built-in charge controller to protect your battery from inconsistent charging and over-charging.

Many solar chargers don’t include a controller, so this is a nice addition. Some manufacturers and users argue that including a charge controller on solar panels this small is overkill, but they are a vital addition if you plan on using the charge controller consistently.

Second, Battery Tender also includes an integrated blocking diode in their solar chargers. Without a blocking diode, your battery can leach electricity when the solar panel isn’t in use, leading to a dead battery. If you don’t have a blocking diode in your solar charger, you have to disconnect your battery from your solar charger every night.

People use these solar chargers for all sorts of vehicles: boats, RVs, cars and trucks, and camper trailers. Some even permanently mount the solar charger to the front or top of their camper trailer.

Customers confirm the charger’s great performance stats and noted that, even though the chargers are large, they are lightweight and easy to maneuver.

If you’re looking to keep your car topped up, you can simply attach the alligator clips to your battery and place the solar panel on your dash and let the sunlight do its work.

Bottom Line: Battery Tender’s Solar Charger is a bit more expensive than others on our list, but you get an integrated charge controller and blocking diode. Even though it’s larger than others on our list, with these nice additions you don’t have to worry about your car’s battery. It’s one of the safest, easiest chargers to use.

Best Solar Battery Charger for Boats

Quick Look: DuraVolt’s sturdy solar chargers are specifically designed for heavy-duty marine use.

The DuraVolt 20W Marine Solar Battery Charger tops our list for the best solar battery charger for boats.

Solar panel manufacturer ITC Solar originally manufactured their DuraVolt solar panels to power high-tech buoys designed to monitor water quality in Tasman Bay in New Zealand. Realizing recreational boaters and other industries could benefit from these small, durable solar panels, they branded them as DuraVolt and now you can find them on Amazon.

These solar chargers are semi-flexible and covered in a plastic film and aluminum backing. The solar charger is wrapped in a heavy-duty rubber gasket with a mounting hole in each corner. Their 20W solar charger is quite small, only 14” x 16” and just 1/4” thick.

The solar chargers come pre-installed with an SAE output plug, as well as alligator clips, battery terminals, and a lighter adapter so you can charge your boat in whatever manner is easiest.

An important note: The charger doesn’t come with a blocking diode or charge controller.

DuraVolt claims that a blocking diode is unnecessary, thanks to their solar panels’ high-quality internal components. If you’re not comfortable taking their word for it, they will send you one for free.

A handful of buyers have installed blocking diodes or kill switches themselves to avoid any potential issues.

DuraVolt also notes that their 12v chargers don’t need a charge controller, as they use self-regulating panels with a lower operating voltage than other 12v solar panels. A handful of buyers still use a charge controller, but the manufacturer notes that it is not necessary thanks to this low voltage.

Many buyers permanently attach the charger to the deck or T-top and use it to keep the battery topped up when moored or when out on the boat during the day.

Reviewers continually praise the charger’s simplicity and toughness. All you have to do is bolt it down, put on the right adapter, and connect it to your battery.

Bottom Line: The DuraVolt 20W Marine Solar Battery Charger is the perfect option for your boat or any other intense setting where ruggedness and dependability are key – and water is imminent.

Best Solar Battery Charger for RVs

Quick Look: Thanks to the ultra-strong magnetic back, DuraVolt’s Magnetic Battery Maintainer is about the easiest solar charger to install.

We looked at DuraVolt’s Marine Solar Charger above, but their solar chargers are not just for boats. DuraVolt also manufactures a magnetic solar charger based around the same extremely rugged solar panel as their marine products.

Their Magnetic Battery Maintainer is specifically designed for fifth wheel and camper trailers. The 8.3W solar panel has an extremely powerful magnetic back that sticks to any surface, including your fifth wheel’s hitch or even the hood of your vehicle.

DuraVolt uses neodymium magnets, the strongest magnet on the market, for these chargers. Many users note that they were initially skeptical of the magnet, but they found that the panel does not move an inch even after high speeds and bumpy roads. This makes DuraVolt’s magnetic solar panel – quite literally – the easiest installation of all the chargers on our list!

Just like DuraVolt’s marine charger above, this solar panel is covered in a semi-flexible plastic film and aluminum backing for maximum durability, while also making the solar panel incredibly light. It’s 12” x 10”, just a ¼” thick, and weighs 1.9 pounds. As the solar panel is semi-flexible, it can flex to the curve of your vehicle’s hood or any other metal, ‘gently curved’ surface.

The charger includes a 10′ cord that ends with an SAE output as well as alligator clips and battery terminal adapters.

DuraVolt claims that their solar battery chargers do not need a blocking diode or charge controller, thanks to their unique design and quality components. Some buyers choose to add them after buying the kit, but most seem to install the kit exactly how it is and the charger still works great.

DuraVolt customers typically have two things to say about the company. First, their solar panels are incredibly durable. You’ll certainly pay more for them, but you’ll also know your RV’s battery will always be ready to go. Second, DuraVolt’s customer service is excellent. Wait time is short, there’s no long phone prompt menu, and the employees are knowledgeable.

Bottom Line: DuraVolt’s Magnetic Battery Maintainer might be more expensive than other similarly-sized battery chargers, but it’s easy to install, extremely rugged, and backed up by excellent customer service.

Best Solar Battery Charger for Motorcycles

Quick Look: A compact, low-cost solar charger with great customer reviews.

Keeping your motorcycle battery topped up in the off-season is easy with POWOXI’s 3.3 watt solar charger. It is compact and 100% waterproof.

The charger uses amorphous silicon solar cells, which perform well in low-light conditions. At 3.3W, you should have more than enough power to keep your bike’s battery charged up. The solar panel is encased within UV-resistant ABS plastic and includes mounting holes in each corner, along with suction cups to mount the panel.

The charger itself is 14” x 8.5” and just under an inch thick. At only 2.2lb, this compact solar panel is extremely portable and easy to set up. It includes a 10’ cord ending in an SAE output, with alligator clips and a cigarette lighter adapter (if you want to charge a vehicle).

POWOXI also integrates a blocking diode into the charger, so you’re able to leave the charger connected to the battery 24/7 without fear of damaging it (read more on blocking diodes at the end of this article).

The solar panel also includes a small blue LED light right on the front which flashes when it is charging your battery – a nice little touch that allows you quickly keep tabs on your battery’s charging status.

This kit doesn’t come with a charge controller, but most experts agree that any 12v solar kit under 5W doesn’t need a controller, so you should be good to go without one.

Of course, this solar charger isn’t just for motorcycles. Customers report using this little battery charger for jet skis, RVs, trucks, and cars. Many users report that it works great in low light, cold weather, and extreme heat – exactly what you want to hear for an all-weather, outdoor solar charger.

If you want to shave some costs, you’ve got a couple of options. First, POWOXI also manufactures a monocrystalline version of this same solar charger for a bit less. It won’t produce as much electricity in low light conditions, but if you’re just going to connect the charger and leave it for a full season, it’ll work just fine and save you a few bucks.

If 3.3W is still too big for your needs, POWOXI also manufactures a smaller 1.8W version at about half the price, so take a look at that one for an even more budget-friendly option.

Bottom Line: POWOXI’s solar battery charger is low-cost, compact, and easy to set up, perfect for winter when your motorcycle is in storage.

Best Solar Battery Charger for Phones

Quick Look: This compact, durable solar battery charger includes 2 USB ports for your smartphone and includes a built-in ammeter that tells you how much juice your solar panels are producing.

BigBlue’s 5v, 28W solar charger packs a punch big enough to charge your smartphone, tablet, or any other 5v gadget. It uses Sunpower solar panels, some of the most efficient solar panels currently available! Needless to say, it’s a quality item that you can depend on.

The charger comes with two USB ports, providing up to 2.4 amps per port, with a max of 4 amps overall. This charger detects your connected devices and charges each in the fastest method.

Some solar chargers have a hard time restarting after shade or rain block sunlight. With these products, users have to unplug their devices to jolt the device into working again. BigBlue has solved the issue by including a chip that automatically pauses charging when shaded, then restarts when sunlight is available again. Needless to say, this means you don’t have to worry about your charger no matter the weather.

The device even includes a built-in ammeter, so you know how much electricity your solar panels are producing. This is the only charger on our list that has this very helpful feature!

The solar charger measures 11” x 16” x 1” when closed, and weighs just 21 ounces. It’s smaller and lighter than a laptop, so it’s easy to throw in a backpack when you’re on a day hike or moving around the city all day. Once unfolded, you’ll find four small solar panels wrapped in heavy-duty, waterproof canvas.

This is one of the more popular solar chargers for iPhones and other smartphones and for good reason. Users routinely say the charger is durable, fast-charging, and well-priced.

Some seemed disappointed that the charger doesn’t provide a full 28W, but unless you’re in absolutely perfect conditions, no solar panel is going to provide its nameplate wattage – that’s just how it works.

Bottom Line: BigBlue’s solar charger is the perfect option to charge your iPhone. It’s extremely portable, low cost, and well-made.

Best Solar Battery Charger for Laptops

Quick Look: A serious off-grid solarbattery kit that provides 5 to 24 volts and can charge laptops, phones, tablets, and other gadgets.

The most expensive item on this list, but also one of the most capable, Voltaic System’s Arc 20 is specifically designed to charge laptops and includes not only a solar panel, but a battery pack as well. It’s designed and built for those times when the utility grid is simply not an option.

Most of the solar battery chargers that are designed for smartphones typically provide only 5v of power because that’s all the power you should need to charge your phone or tablet. The Arc 20 includes three different power output options:

  • 1 USB 5v/2A output
  • 1 USB-C 5v/3A output
  • 1 high-voltage laptop port (12V/6A, 16v/5A, 19v/4.5A, and 24v/3.5A)

The battery pack has a capacity of 24,000mAh, enough for 1 laptop charge, 7 smartphone charges, or 3 tablet charges. The kit pretty much has everything you need to get all your devices running off solar, including:

  • DC output for laptops
  • 10 connectors for different laptops, but check the list to make sure your laptop is one of them!
  • Car charger
  • AC wall adapter

With pass-through charging, you can also charge both the battery pack and your device from the solar panel at the same time. Voltaic Systems estimates 6 hours for a full laptop charge and 1 hour for smartphones.

The foldable 20W solar panel is wrapped in heavy-duty canvas and outputs 18v to charge the battery pack in just six hours – pretty quick considering the size of the battery pack.

The whole kit weighs just 3.25lb and is about the same size as a laptop, so you can add it to your backpack without too much trouble.Customers absolutely love this kit. This kit doesn’t have as many reviews as some, probably due to the higher cost, but customers certainly put this thing through the wringer, claiming it’s for serious off-grid use and that it’s up to the task.

Peace Corps trips in West Africa and extended trips in the backcountry are just a couple of the situations in which people have successfully used this charger.

Bottom Line: The Voltaic Solar Charger may be pricier than others on our list, but it is built to take any extended, harsh off-grid trip you can throw at it. Buy it and know you’ll always have juice for your laptop, no matter what.

Best Solar Battery Charger for Backpacking

Quick Look: A thin, ultralight – and ultra simple – solar battery charger perfect for those extended backpacking trips.

When backpacking, you’re carrying everything right on your back for days at a time. Shaving weight from your pack means you can travel faster, longer, and with less fear of tiring out or injury.

With smartphones increasingly used as camera, compass, GPS, map, guidebook, notebook, and emergency communicator, keeping your phone charged becomes increasingly important.

Of course, a solar charger is just one more thing to bring, but thankfully Renogy’s E.FLEX solar charger is perfectly designed for backpacking trips. First off, it’s only 0.08” thick and 9” x 6” when folded, so it’s easy to throw it in your pack or clip to the outside of your backpack while hiking.

Second, it’s incredibly lightweight at just 0.7lb – one of the lightest solar chargers, if not the lightest, on the market.

It comes with 4 suction cups and 2 small carabiners so you can attach it to the car windshield on the way to the trailhead or to your backpack or tent while in the backcountry.

At 10W, this solar charger doesn’t produce too much energy, but it is certainly enough for your smartphone. Users note it can charge smartphones and laptops in a few hours, but it needs full sunlight to charge efficiently. If you’re stuck in cloudy or rainy weather, 10W just isn’t enough to charge.

However, don’t let that turn you off to this awesome little solar charger. Renogy makes excellent solar-related products and their gear always enjoys top-notch reviews from customers. This small solar charger is no different. Most customers praise its charging abilities, simplicity, and lightweight design.

Renogy actually makes a few different models of the E.FLEX solar charger:

  • 10W Plus: This is the product we review here. It features a polycrystalline silicon solar panel and it’s thinner and lighter than the standard option below.
  • 10W Mono: About half the price of the 10W Plus, the 10W Mono is about 2 ounces heavier and almost 2x as thick (which, at 0.13 inches is still incredibly thin). Other than that, it’s got the same specs as the Plus (namely 5v/2A power output) at a much lower price.
  • 5W Plus: All of the benefits of the 10W Plus, but half the wattage and only 5.6 ounces.
  • 5W Mono: Same as the 10W Mono, but only 5 watts and 6.7 ounces.

Bottom Line: Renogy’s E.FLEX line of ultra-thin solar chargers are the best option available for backpackers. They’re cheap, reliable, and extremely lightweight.

Best Solar Battery Charger for Rechargeable Batteries

Quick Look: Solar battery charger for AA, AAA, and 9v batteries. Includes 7 charging bays, 2W crystalline solar panel, and built-in LED indicator lights. Compact box design with retractable handle.

Keeping all of our devices well charged is important, but sometimes we need batteries for other things like flashlights, toys, and remotes controls. Wouldn’t it be great if you could charge those batteries with solar as well? Well, great news, you can!

With this portable battery charger from Sunway Solar, you can charge your AA, AAA, and 9v batteries anywhere where you can find sunshine.

This small box-like charger is 6.9″ x 6.7″ and weighs only 1.15lbs, the perfect size for camping trips. The retractable handle makes it extra portable and easy to set up. The handle doubles as a stand so you can angle the solar panel for effective charging.

Sunway Solar also included convenient LED indicator lights so you always know your charger’s charging status. It also comes with a built-in diode to prevent power leaching.

Bottom Line: The Sunway Solar battery charger is the perfect way to keep all your household battery-operated devices charged up. The compact design makes it easy to use at home or on the go!

Tips for Choosing the Right Solar Charger

Solar battery chargers are pretty simple pieces of equipment. That being said, there are a few things you need to know if you’re in the market for a new solar charger. Here are a couple of tips to help you find the right solar charger for you.


With solar chargers coming in sizes from 2W to 30W, finding the right size for your needs is key. You want it to be big enough to keep your battery topped up but not too big, since you don’t want to waste money.

Most solar chargers for vehicle batteries come in around 5W to 15W. Larger vehicles typically require larger batteries, but it depends on your vehicle’s phantom load (the power pulled from the battery even when the key isn’t in the ignition) and driving frequency. If you’re worried, 10W to 15W should be enough to keep any vehicle ready for use.

If you’re looking to charge your smartphone or tablet, you’ll probably want a larger solar panel. Most solar chargers for small devices sit around 15W to 30W, with the average coming in around 22W to 28W. Exactly how many watts you need depends on the specific devices you want to charge, as well as how many devices. We recommend 20 watts or more for general use.


If you’re looking for a solar charger for your 12v battery (like the one in your car, boat, or RV), you’ll want your charger to include a blocking diode and the correct cords for your application. You’ll want alligator clips for short-term use, battery terminal rings for long-term storage, cigarette adapters if you want to charge in the car.

On top of that, you’ll want to ensure the panel can be installed in the manner you’d like. Does it have mounting holes in each corner? Can it be glued down or not? These questions are easily answered by reading the description and customer reviews or even asking the extremely-helpful Amazon community.

If you want to charge your 5v gadgets (smartphones and tablets), you’ll need to ensure the charger has enough ports for your needs as well as the right type – USB, USB-C, etc.

Also, how about mounting? Does it have holes in each corner? Does it come with carabiners or suction cups to clip or stick to different surfaces? Take a second to read the description and reviews to see exactly what features come with the charger.


Solar battery chargers aren’t particularly expensive, typically between 20 to 60, depending on the size of the solar panel and the included features. The higher-end models can come in at 100 and tacking on a battery pack can add even more.

If you’re looking at solar chargers for your vehicle or boat, you’ll find that solar chargers are a bit more expensive than a typical battery charger that you plug into your wall. However, the benefits of a solar charger, mainly its portability and versatility, far outweigh the slight cost increase.

Charge Controllers and Diodes

If you’re looking at solar chargers for a 12v battery, you’ll probably see a lot of discussion around blocking diodes and charge controllers and whether this or that particular product needs one. But what the heck are they? And are they even important?

Blocking Diodes – You Need Em!

Most of the better solar chargers include a blocking diode integrated into the solar panel. The diode allows electricity to flow towards the battery, but blocks electricity from flowing in the opposite direction. Without a blocking diode, your battery can send electricity back to the solar panel at night, when the panel isn’t producing electricity.If your solar charger doesn’t have a blocking diode, you’ll need to disconnect the charger from your battery each night. With a blocking diode, you don’t have to worry about this power leaching.

Unless the manufacturer specifically notes that blocking diodes aren’t necessary (like DuraVolt above), make sure your solar battery charger includes one!

Charge Controller – You Might Need It

Charge controllers keep your solar panel from overcharging and damaging your battery. For large solar installations, they are a required piece of equipment. Small battery chargers don’t typically include a solar charger and many manufactures note that 12v solar chargers don’t need a controller, as they don’t provide enough juice to overcharge the battery.

However, some recommend purchasing and using a charge controller for any solar panel larger than 5W. Many people report they use their solar battery charger without any charge controller and haven’t experienced any negative issues.

If there are ever any voltage spikes or your battery charger is left connected to your battery for an extended period of time, there’s a chance you could damage it.

If you’re worried at all, it’s probably best to either buy a solar charger with an integrated charge controller (like the Battery Tender above) or spend the extra 20 on a separate charge controller.

Pros and Cons of Solar Chargers

Solar chargers are a great way to keep your batteries easily charged up, but they’re not perfect. Let’s take a look at the pros and cons of solar chargers.

Pros of Solar Chargers

  • Free energy: This is an easy one. Once you buy the solar charger, you never have to pay for electricity or generator gas to top your batteries up. Use it for a year or 20 years, your fuel costs will be the same: absolutely zero.
  • Charge without utility power: This is the biggest draw to solar chargers. Since they’re powered by the sun, you’re able to charge your devices anywhere there’s sunlight. On your boat, while camping, in your RV, your driveway – you name it! No longer do you have to worry about moving your batteries into the garage or running cords outside. Just hook the charger to your battery and put the solar panel in the sun!
  • Easy setup: No need to take out your batteries or move your boat or ATV close to the garage. Just hook your battery or smartphone up to your solar charger and place the charger in the sun. Done!

Cons of Solar Chargers

  • Not a ton of power: Solar chargers typically only produce about 2W to 30W of electricity, depending on the intended use. It’s more than enough to keep your battery topped up, but that’s not a lot of electricity. You’ll need to base the size of your charger on your own needs. The more you use the battery, the bigger your solar charger needs to be. If you want to keep two batteries fully charged, you’ll need to buy two solar chargers.
  • Higher cost: Solar battery chargers are more expensive to purchase than plug-in chargers. That’s just a fact. Of course, with a solar charger, you don’t have to pay for any electricity, but we add this to the list of cons to keep everything balanced.

Overall, we think the flexibility, functionality, and ease of use of solar-powered battery chargers easily make up for their higher purchase price.

If you’re looking to keep your vehicles’ battery or smartphone topped up, solar chargers can get it done.

How To Get The Most Out of Your Solar Charger

These chargers are easy to use and require little to no maintenance, but there are a few things you can do to ensure that you get the most out of your charger.

Keep it clean

If you know anything about solar panels, then you should know that keeping the panel clear of dirt and debris is vital. It cannot generate power if the sun can’t get through, so make sure your solar panel is clean.

Watch the weather

It is important to know what your solar charger is capable of in terms of surviving the weather. Many models are weatherproof, but some are not, so be sure to double-check your panel’s specs before leaving your panel out in the bad weather.


We hope you enjoyed our list of the best solar battery chargers in 2021. Just as a quick review, we looked at hundreds of battery chargers on the market, and chose the best in 8 different categories. Here are the top picks.

Compare the Best Solar Battery Chargers for 2021

  • Best Solar Battery Charger for Cars: Battery Tender Solar Charger
  • Best Solar Battery Charger for Boats: DuraVolt 20W Marine Solar Battery Charger
  • Best Solar Battery Charger for RVs: DuraVolt Magnetic Battery Maintainer
  • Best Solar Battery Charger for Motorcycles: POWOXI Solar Battery Charger
  • Best Solar Battery Charger for Phones: BigBlue 28W Solar Charger
  • Best Solar Battery Charger for Laptops: Voltaic Systems Arc 20 Rapid Solar Laptop Charger
  • Best Solar Battery Charger for Backpacking: Renogy E.FLEX 10W Ultra Thin Solar Charger
  • Best Solar Battery Charger for Rechargeable Batteries: Sunway Solar Store Solar Battery Charger

Take a look at the products above and find the best solar battery charger for you! Like we’ve pointed out, the best options are durable, cost-competitive, and backed up by excellent customer service. And beyond the versatility and ease of use, using a solar battery charger and running your life off the sun –even if it’s just a tiny part of it – is great for you and the environment!

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Choosing a Solar Battery Trickle Charger Maintainer

Jan 26th 2022

When you think about solar panels, what is the first thing that comes to mind? The chances are that you pictured massive fields of industrial-use panels or rooftop-mounted residential units. While these are some of the most commonly used types of solar panels, the technology has advanced substantially in recent years.

Solar panel manufacturers are able to create smaller and more efficient panels. This improvement has allowed them to use scaled-down panels for a variety of purposes, including in solar battery trickle chargers, which allow you to charge your car battery with solar. These devices are a great way of keeping the batteries on certain pieces of equipment charged and ready for use.

What is trickle charge?

Trickle charge is used to compensate for the capacity loss of the battery due to self-discharge after a full charge. To compensate for self-discharge, the battery is kept in a continuous low-current charge that approximates a fully charged state, also known as maintenance charging. Generally, Battery Maintainer is the same as Battery Trickle Charger on Renogy, There are types of battery trickle chargers available for sale here.

Below, we discuss what a solar battery trickle charger is, how they work, and what they are best used for. If you are looking to take advantage of this convenient technology, keep on reading.

What Is a Solar Battery Trickle Charger Maintainer?

As the name implies, a “solar battery trickle charger maintainer” is a solar-powered device that is used to charge batteries. Trickle charges have been in use for decades. However, solar-powered variants are a relatively new technology.

A trickle charger is a safe and effective way to ensure that your battery keeps a charge, even if the device that it is installed in has not run for a long time.

Typically, you may hear before the trickle charger for cars, but there are more on that below. Traditional trickle charges must always remain plugged into a power source, which makes them a bit tedious to use.

Conversely, a solar battery trickle charger only needs to be connected to the battery. This flexibility makes them much more versatile than standard trickle chargers.

As long as the trickle charger’s flexible solar panels are in direct sunlight, the device will keep operating as designed. The solar panels allow you to trickle charge batteries, even if you are not anywhere near a power outlet.

How Do Solar Panel Trickle Chargers Really Work?

Operating a solar battery trickle charger is incredibly easy. The typical charger has three components, which include the following:

In order to set up your solar battery maintainer, simply connect the alligator clips to the positive and negative poles of the battery that you want to charge. One clip should be attached to each pole. Next, place the flexible solar panel in a location that is in direct sunlight.

Depending on which model of trickle charger you purchase, there may be a small “on/off” switch on the inverter box. If so, make sure that the switch is turned to the “on” position.

Keep in mind that not all solar battery trickle chargers have these switches. If yours does not, it will automatically begin working once the clips are connected, and the panel starts producing electricity.

Before we discuss the difference between standard battery chargers and solar battery chargers, let’s cover a few frequently asked questions regarding solar trickle charger maintainers:

Can I Leave a Solar Trickle Charger On All the Time?

Yes, the most convenient aspect of using a solar battery trickle charger is that you can leave it on all of the time. Trickle chargers deliver a small, steady stream of electricity to the battery. The amount of electricity is so negligible that the device will not overcharge your battery, no matter how long you leave the device connected.

The only time you should disconnect your trickle charger is when operating your piece of equipment. For instance, if your solar battery trickle charger is connected to your boat, remove the alligator clips and secure the portable solar panel before starting the motor.

With that being said, it is important to note that trickle chargers are not suitable for “jump-starting” a battery that is completely drained. While a solar battery trickle charger will eventually recharge the battery, this process takes hours.

Trickle charger maintainers are designed for preventing batteries from going dead. They are also useful for recharging batteries that you do not need to use immediately. If you need to start a piece of equipment quickly, then you will need to use jumper cables, a standard battery charger, or a jump box.

Do Solar Car Battery Chargers Work?

Do solar car battery chargers work? Yes, solar battery trickle chargers work as well as, if not better than, standard trickle chargers. They are particularly useful if you are in a rural area and are not near a standard power outlet. These devices will steadily charge the battery that they are attached to as long as they are exposed to sunlight.

Can a Car Trickle Charger Ruin a Battery?

No, solar battery trickle chargers will not ruin a battery. However, a standard battery charger may. This discrepancy exists because a regular power battery charger is designed to rapidly recharge the device it is connected to. If it is left on too long, then it will diminish the capacity of the battery.

There is no risk of ruining a battery’s capacity when using a solar trickle charger maintainer. That is why these devices are becoming much more popular than traditional battery chargers.

What Size Solar Panel Do I Need to Trickle Charge a Battery?

The size of the solar panel you need to trickle charge a battery will depend on its capacity. For instance, let’s say that you need to charge a 100ah battery. The average device charges a battery at 12 volts and 20 amps per hour. Therefore, it would take approximately five hours to fully charge your 100ah battery.

In order to calculate the wattage you will need, multiply the amps by volts. Using the information from our scenario, 20 amps times 12 volts equals 240 watts. Portable solar panels are available in increments of 100 watts. In this scenario, you would need either one 300w solar panel or three 100w solar panels.

Want to skip all that math? If so, then check out our solar panel calculator. All you will need is some basic information about your battery, and our handy tool will do the rest.

What is the Difference Between a Battery Charger and a Battery Maintainer?

On occasion, the phrases “trickle charger maintainer” and “battery charger” are used interchangeably. While both devices are designed to charge a battery, they are not the same.

A battery charger is designed to recharge a battery as rapidly and safely as possible. These devices do this by delivering a large amount of amperage and voltage to the battery so that you can get your equipment running quickly.

While using a battery charger is an effective way of cranking a piece of equipment that has a dead battery, these devices cannot be left plugged in all of the time. If you do, then the device will seriously diminish the capacity of your battery.

On the other hand, solar battery trickle chargers take a “slow and steady” approach to charging batteries. They deliver an incremental amount of electricity over several hours in order to recharge a battery or keep it from dying when not in use.

Solar Battery Trickle Charger Uses

Solar battery trickle chargers are versatile pieces of equipment that can be used for many different applications. If you need to charge a small battery and have access to plenty of sunlight, solar trickle charger maintainers present a great option. Some of the most common use cases for solar trickle chargers include:

Most lead-acid batteries have warranties of five years or fewer. You can expect to see warranties of ten years or more for lithium-ion batteries.

Solar Battery Temperature

Like anything using electricity, temperature is a constantly important consideration. Batteries won’t do well in either extreme heat or extreme cold. The best place for a solar battery is in a temperature-controlled space where it won’t be exposed to the elements.

Trickle Battery Charger for Car/RV

Typically, you use your car often enough that the battery does not have a chance to lose its charge. However, batteries in cars that have not been driven for days or weeks will eventually go dead. In order to prevent this, you can attach a solar battery trickle charger for car battery to your vehicle’s starter battery.

Car trickle charger maintainers are also excellent for RVs and campers. Unlike cars, RVs frequently sit around for weeks or even months. During that time, the battery will likely go dead if it is not charged.

Remember, your RV does not have to be parked in direct sunlight. Only the flexible solar panel needs sun exposure to work. If your RV is stored in the shade or within a building, simply run wires from the panel to the battery. The flexible solar panel can be attached to the roof of your storage building so that it gets maximum sunlight.

volt, watt, solar, battery, charger


If you own a boat or other marine equipment, you know just how frustrating a dead battery can be. You carefully plan a trip to the lake or bay, only to find that your boat’s battery is dead. Keeping your boat battery charged is often a challenge, especially if you store it at a marina, as there is little to no access to power outlets.

Fortunately, solar battery trickle chargers present the perfect solution. The solar panel can be placed on the deck of your boat, and the alligator clips can easily be connected to the battery. This setup ensures that your boat is ready to use all year round.

Outdoor Equipment

Solar battery trickle chargers are a great way of keeping all of your outdoor equipment charged and ready to go. This coverage includes four-wheelers, ATVs, side by sides, tractors, riding lawn mowers, and more.

You can quickly connect a trickle charger maintainer to any of these devices without having to break out the hundred-foot extension cords.

Trickle charger maintainers are a true “set it and forget it” way of charging equipment batteries. You never have to worry about ruining your battery or going out to mow the lawn only to find out that your equipment will not start.


That’s right; solar battery trickle chargers can be used to charge cell phones as well. The inverter boxes on many trickle charger maintainers include USB ports so that you can quickly connect the charging cord of your cellular device.

Solar-powered trickle charger maintainers have become hugely popular among avid outdoors fans, campers, and hikers. Small flexible solar panels can easily be deployed at a campsite or attached to a backpack.

How to Choose the Best Solar Battery Trickle Charger for a Solar Energy System

As you can see, solar battery trickle chargers are extremely versatile and user-friendly devices that can be connected to just about any type of battery. However, not all trickle charger maintainers are created equal. That is why it is vital that you do your research and carefully choose the right solution for your solar energy system.

There is no one-size-fits-all option when it comes to solar battery trickle chargers. You should consider several factors when selecting your equipment, including:

Number of Charging Ports Needed

Some trickle chargers and power banks include multiple USB ports. If you go camping with multiple people and want everyone to be able to charge their devices, then select a battery with more than one USB port.

On the other hand, if you are a solitary person who likes to venture out on your own, then a smaller device with only one port will work just fine.

Capacity of the Device

Another major consideration is the capacity of the device that you need to charge. For example, a deep cycle battery used for a large boat will have a higher capacity than your cell phone. If you are purchasing a solar battery trickle charger for your boat, then you need to select an option with large panels.

Whether or Not You Want to Charge Devices After Hours

The only real downside of solar battery trickle chargers is that they only work during daylight hours when they are exposed to direct sunlight. Fortunately, there is a way to remedy this shortcoming. You can supplement your trickle charger maintainer with a portable battery pack power bank.

If you are using your solar battery trickle charger with large equipment, such as an RV or boat, you may want to incorporate a power box into your system. These devices work like portable power banks, but they store much more energy.

Before selecting a solar battery trickle charger, make sure to consider all of the ways you plan on using it. You can also connect with our experts if you need additional guidance.

Quality Trickle Charger Maintainers from Renogy

If you want to charge your car battery with solar, Renogy can help. We are the premier provider of trickle charger maintainers, home solar panel kits, solar panel monitoring equipment, and more. You can check the following video to learn about Renogy’s 5W, 8W, 16W Solar Battery Trickle Charger. Renogy’s Solar Battery Maintainer can help you maintain a healthy battery, which can convert solar power into a usable 12V DC current to keep your battery topped off at a stable level.

No matter what type of home or vehicle solar equipment you need — car, boat, whatever — we have the perfect trickle charging solutions in our massive online inventory. Check out our learning center to find out more or contact us for support.

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