Topsolar 10 Watt 12 Volt Solar Trickle Charger 10W 12V Solar Panel Car Battery Charger Portable Solar Battery Maintainer for Car Motorcycle Boat Marine RV + Cigarette Lighter Plug Alligator Clip

I originally bought this panel with the idea of putting it on my shed roof and using it to keep my lawn tractor battery topped up. My tractor is old and the charging system is pretty much non-existent, but since the battery is mostly used only to crank the engine, I can get through an entire season with it.Almost.The battery, like the tractor, is starting to get a little tired. I've found myself having to take it out and charge it to get through this season. Let's face it, this battery is on its last legs, and I'm just hoping I can get through the next few weeks with it.So I bought this solar panel and immediately ran out of time to install it on the tractor. Instead, I stuck it in my truck. My poor old truck sits unused for weeks at a time. It always starts, but it tends to crank pretty slowly because the battery draws down between uses. This charge/discharge cycle is hard on both batteries and alternators, and both have gotten too expensive to abuse and potentially damage.Since I don't drive the truck much and I don't want to run a battery tender outside, I decided to repurpose the solar panel as a truck battery maintainer. For this, it works perfectly.The panel mounts to the inside of the windshield with four suction cups. Easy to put on, easy to remove when I want to drive. The panel itself is very thin so I have to treat it gingerly. I wish I could find a solution that didn't involve removing it every time I want to use the truck but so far I haven't. We'll see how it holds up over time to being repeatedly installed or removed. I envision flexing it just a little too much and hearing a fatal cracking sound but so far it's been fine.The panel uses SAE connectors which allows you to attach to the cigarette lighter dongle, alligator clips, or dedicated ring terminals. I use the cigarette lighter adapter because the lighter socket is live on my truck all the time. If your vehicle disconnects the lighter socket when the ignition is turned off, you'll have to figure something else out.SAE connectors are hermaphroditic connectors. That means that two SAE connectors will plug together, but the polarity will reverse (IE the "positive" terminal of one will feed the "negative" terminal of the next one). I triple-checked that the panel would not be wired in reverse polarity in my installation. The panel has a reverse-polarity indicator but I prefer to use a multimeter and see for myself. You can get polarity reversing adapters if you need them but I didn't.Last time I went to use my truck, the panel had been on and charging for about a week. The truck cranked just as quickly as if I'd put the battery on a dedicated charger. I haven't checked current output or state of charge of the battery, but my seat-of-the-pants analysis tells me that it's keeping the battery topped up. Impressive considering we've had a few cloudy/rainy days this week. We'll see how well it works over the winter.In all I'm impressed with this panel. It's a simple solution that (so far) seem to work well. It's WAY less expensive than buying a battery so if it continues to work, I will consider it money well spent. I'll update once I've used it a while longer.

I've had a few times where I came out to start my car and the battery was dead, But that was because the dash cam had drained the battery. My power port never shuts off even if I turn the car off. The only way to turn it off is to disconnect the battery or pull the fuse. And it's a Wi-Fi – cam so I was searching for a Wi-Fi hotspot and on top of that it's always recording, It never stops. Show you this. You just ate a lot of power. With this trigger charger, it has just enough juice to run the dash cam without it draining the battery completely. I've been able to leave it for 5 days and have no issues. Used to be only about 2 days and I couldn't start my car. I haven't tested it beyond 5 days cuz frankly I'm tired of asking my neighbors for jumps. But it works great. It's full of power via the power port because yes I have two of them. I mean why wouldn't you always be on in a car?.. It's actually one of the many things here that works as advertised. I haven't been a meter to it yet, but I think it pushes a bit more than 10 w in direct sunlight, but considering my car is usually parked beneath an awning, it still provides enough power to power the dash cam and keep the battery charged so that it'll start whenever I need it. So it was a great value. Definitely worth the money paid. And I would definitely recommend it. The only issue is it does get quite hot sitting in the sun but it is black and I live in Arizona, those are two things that do not get along. If they can make it white it'd be perfect.

This panel is being used to trickle charge a Subaru that has an aftermarket head unit in it that was causing a slow drain on the battery which eventually results in a NO START condition. After a couple of months of use this panel has kept up with the drain and ensures the car will start when needed.The only disappointment has to do with the suction cups. When installing on a curved window the suction cups are too low profile to allow the panel to properly "stick" to the glass because of the small built in charge controller. I've given up on the suction cups and have just placed the panel above the wipers on the windshield.

Works great! I had to replace the other one because it got under the blades. I'll have to buy 2-more. It works better than my old one of 3-years. My riding mower battery is 2-years old and still running strong.

This 10w solar trickle charger does a great job topping off truck battery as I only drive it once every 3-4 weeks. It would not work inside through the adapter as this is off when ignition is off so the solar plate sits outside on the windshield. I've checked it a few times after not driving it and it's still at 100%.