I read through the reviews before purchasing, and knew about the quality concerns with the alligator clips ahead of time. I ordered one for my Dad's 2001 Toyota Avalon back in really December, which was parked in his driveway in Delaware and barely used due to medical issues and having a newer vehicle available... but he wanted me to start it once in a while to keep the battery charged while he was in the hospital for an extended stay. The cold temps were depleting the battery, and this was just enough to keep it topped off on charge so that it didn't need a jump start.

I liked it so much that I ordered a 2nd one for my 95 Grand Cherokee back home in Arizona, which wasn't being used at all while I was in Delaware helping my sister care for my parents and keeping up with their house.

When I went to install the 2nd one on the ZJ, the battery terminal on the red top Optima battery was a bit bigger than the Avalon's regular battery and the alligator clip broke when trying to get it on the positive terminal. I knew when I was doing it that trying to get it on the larger terminal and squeezing the clip would stress the plastic and spring, but I did it anyways... and it broke in half. I tried to put it back together, but that obviously wasn't working - so I reached out to the company and explained what happened offering to purchase a new set of connectors.

Their Customer Service was stellar, and in top of the immediate apology for my dilemma they sent out a replacement set of connectors which were received that same week. Amazing response time & quick shipment of the replacement negated any complaint that I had with the product - and installing the new alligator clips on the ZJ this time with a bit more delicacy and finesse so as to not over flex the spring or stress the plastic on the larger terminal.

I returned back to Delaware after being gone for 5 weeks. The original unit was still with the green light, parked facing to the sun attached to the outside of the windshield - which it had direct sunlight from about 9am to 4pm daily. The old Avalon fired right up like the battery was brand new!

I spent a month in Delaware, and after getting back to Arizona I tested the ZJ - also parked facing the sun with the solar charger attached to the outsiden of the windshield and getting direct sunlight from 7am to 5pm. The 5.2 liter V8 fired right up with no lag like it was still being driven daily.

I'm happy with the product quality and performance, and highly recommend it for anyone who has a secondary vehicle that doesn't get a lot of use to avoid the frustration of discharge and having to jump start.

I’ve been using this solar setup on my motorhome for a year now on the engine battery, Midwest winter was brutal and this solar battery maintainer kept the 12 volt battery up to charge. I go out and start it and let it run once every 7 days and this unit has done a great job.

This solar panel charger works great. My car’s alarm system is draining the battery so I bought this solar charger. I use the car once a week and it barely starts or the battery is low so this keeps it charged. The true test was the last two weeks, I was out of town and came back and it started right up. I clamp it onto the battery clamps that are on the posts and thread the wires to the charger through the hood near the windshield wipers and where the door closes. I put the panel on the dash which gets partial sun all day. I disconnect the clamps from the battery before starting and it started right up.

Installing is easy. If you have a “live” cigarette lighter when the engine is off, then you can plug it into the lighter aka usb plug in.

I bought this to put on my 4 wheeler just to make sure the battery stayed up. But instead put it on a tractor. It worked great, it hadn't run for a couple months and it fired right up. I like the size and how well it worked, I ordered 5 more. The only thing that could make this better is a pigtail that bolts on to the battery also.

I found out my new Maverick hybrid uses all kinds of power when I'm not driving it. Although, I think this issue probably pertains to most newer vehicles. Wifi, remote starting, 24hr dashcams, app monitoring, etc. They keep going via the 12v starting battery. Kills it in days. I started jump starting my truck before I even had 200 miles on it. You can shut those battery killer options down in settings, but I actually want most of the 24hr monitoring... Or get this... I want having enough battery to use the AC! I frequently go days without driving, or even drive far enough to recharge the battery between starts. I don't want to run an extension cord to use a battery maintainer, so solar seems to be the best solution. It

One more hiccup. I want to use it daily, at home. And alligator clips are a pain. I want easy. Plug in. I found out my cig lighter socket is not connected to the battery when the key is turned off. So I bought a cig lighter socket on Amazon that wires directly to the battery. It's fused too. This should've come with one, actually.

Bonus... my battery is under the back seat so forget the firewall. All wiring remains in the cab. When I get home, I lay the solar panel on my tonneau cover. Before I drive away, I just throw it in the back seat. Works great. I'm buying another for my suv.

I have a small trailer that I use periodically. This trailer has the required trailer breakaway system with a rechargeable battery. In the summer it gets lots of use, being connected to a tow vehicle and the battery stays charged. In the winter, the trailer sits for months outside and the battery discharges and eventually dies.

This small solar charger was very easy to integrate into the trailer break away system!

I’ve been looking for a reliable solar trickle charger for my [car/boat/RV – swap in your vehicle] that sits unused for weeks at a time, and the POWOXI 7.5W Solar Battery Maintainer has been a perfect solution. I put together a video showing the full setup if you want to see it in action.

Easy Connection, No Guesswork

Getting this connected took only a few minutes. The kit includes everything you need right out of the box – you get multiple connection options including a cigarette lighter adapter, alligator clips, and a hardwire SAE connector, so you can choose whatever works best for your setup. In my video you can see exactly how I connected it and routed the cable.

Sun Positioning is Simple

The panel is lightweight and easy to angle toward the sun. The included suction cups let you mount it to a windshield, or you can lay it on the dash. I show in the video how I positioned it for maximum sun exposure – it’s surprisingly intuitive and the panel itself is compact enough to move around without hassle.

Solid Build Quality

For the price, the build feels sturdy and the waterproofing gives me confidence leaving it in place on my [vehicle] even when weather rolls in. The 7.5W output is ideal for maintaining a charge rather than fast charging, which is exactly what you want for long-term storage situations – it keeps the battery topped off without risk of overcharging.

What’s in the Box

The accessories included are generous for the price point. As you’ll see in my video, the kit comes well-equipped so you’re not scrambling for extra adapters or hardware.

Bottom Line

If you have a vehicle in storage or one that doesn’t get driven regularly, this POWOXI solar maintainer is a smart, affordable way to keep your battery healthy. Highly recommend it.

Doesn't work on my Tahoe. Solar panel has been sitting on my dashboard in the sun for weeks. I have it plugged into the cigarette lighter--which does receive power w/o key-on. Dead battery this morning.

Updating review. The 7.5Watt model did not provide enough power to keep my Tahoe charged. Which I don't fully understand as an old vehicle shouldn't have an excessive power draw at rest. I'm changing the stars for my review because of POWOXI's exceptional customer service. I received immediate attention solely because of my poor review of the product. We exchanged messages back and forth for a few days describing my issue, my results/images of the tests I ran, etc. (0.162 amps @ 17.29 Volts). POWOXI agreed that the 7.5 Watt model should have sufficed for my vehicle but suggested a higher watt model and offered me a full refund of the 7.5 watt--even even outside the 30 day amazon return policy.

I just purchased a higher watt model from them.

Before heading off for a six-week trip over Christmas to visit friends and family in Australia and New Zealand, I realised I had a small problem — I’d be leaving my truck sitting idle for quite some time. Anyone who’s dealt with a flat battery after a long break knows how frustrating that can be, so I wanted a reliable way to keep the battery topped up while I was away.

After some research, I decided on the Upgraded 7.5W Solar Battery Trickle Charger Maintainer – 12V Portable Waterproof Solar Panel Trickle Charging Kit. It looked like the perfect solution: simple, compact, and completely self-sustaining.

A lot of online advice suggested just plugging a solar charger into the vehicle’s cigarette lighter socket, but when I checked with Ford, they advised against it — apparently, in my model, that port isn’t live when the ignition’s off. So instead, I followed their recommendation and connected the charger directly to the battery.

The setup was straightforward. The kit comes with crocodile clips for easy connection and a generous cable length that easily reached from the battery to the inside of the truck. The included suction cups can be attached to either the front or back of the solar panel, so I mounted it neatly on the inside of the windscreen, where it could catch the light without being obtrusive. The cable is thin enough that the door seal closes perfectly around it, leaving a discreet and tidy setup.

While I was away, I didn’t have to give it another thought. The solar trickle charger quietly did its job, keeping the battery topped up day after day. When I returned home six weeks later, I unclipped it, turned the key—and the truck started first time without so much as a flicker. No power loss, no sluggish start, no hassle.

The build quality feels solid, and the performance exceeded my expectations. It’s weatherproof, easy to mount, and perfect for anyone who leaves their vehicle parked up for long periods—whether it’s a car, truck, camper, or boat.

I’d just advise checking your specific vehicle setup before installing it, as not all models allow charging through the same method. Once you’ve got it right though, it’s brilliant.

All in all, this solar trickle charger is one of those practical, inexpensive tools that just works. It’s saved me time, stress, and probably a few jump-starts down the line.

Highly recommended for anyone who wants peace of mind while their vehicle’s sitting idle.

Works well

Works great, using for my ride on mower, keeps the battery charged. But cord could be a bit longer. I wouldn't rely on the suction cup too much better to use screws

取説が英語表記でLEDインジケータの意味がよく分かってないけど充電は出来てるようなので、安いしいいかも

耐久性は今のところ不明

I recently purchased the POWOXI Solar Battery Charger for my car, and it has been a fantastic investment! The 7.5W solar panel is highly efficient and does an excellent job of maintaining my car battery's charge, even in less-than-ideal weather conditions. The charger is easy to set up and comes with all the necessary accessories, including suction cups and a cigarette lighter adapter.

The build quality is impressive, with a durable and weather-resistant design that ensures longevity. I love that it's environmentally friendly, harnessing solar energy to keep my battery charged. It's perfect for those who don't drive their vehicles daily or for extended trips where access to a power source may be limited.

Overall, the POWOXI Solar Battery Charger has exceeded my expectations in terms of performance and reliability. It's a great solution for keeping your car battery maintained and ready to go. Highly recommend it!