5W Mono Crystlline

Works great on cars and lawn tractor. Keeps batteries fully charged when equipment is not in operation. Shipping was quick.

Something drains the battery in my truck. If I don't drive it for a week, it will be dead. I don't have time to hunt down the drain so I purchased this, as I don't have any outlets near where I park it. 1 week later my truck starts right up. It has been cloudy and a few days it was covered in snow and this still kept the battery topped off. I am super impressed! My one complaint is that the solar panel does not disconnect from the cord at the solar panel. Not a big deal, but I have to open the hood to disconnect it.

Seems to work fine, putting almost 15 volts out measured at the cable end. Mounted inside my windshield with truck facing early morning sun, it brought a battery at 12.1v up to 12.5 v. Sun lasts about four hours before going over the top of the truck. So about four more hours of shade with bright sky light only on the panel. Only issue is there are two batteries on my diesel Ram pickup and the other (passenger side) battery is not getting any voltage. I am charging through the power port. Looks like I have to use the alligator clips on that one and keep both charged by moving the clips to the other battery every day or so. It would be nice to have a splitter so I could plug into the power port and have another wire long enough to go past the door moulding and into the engine compartment to the second battery. Or a splitter with two sets of clips, each long enough to reach the batteries. Not use the power port. One wire could be longer than the other because I mount the panel on the lower driver side of the windshield. I will experiment by letting the batteries go down a bit and hook up the charger clips to the passenger side battery and see if the voltage reaches the driver side battery too. I don't know how these batteries are connected. The suction cups are easy to lose. They are not very secure, especially if the panel is mounted vertically. Be careful if you move the panel a lot.

Works as described.

I used this on my second car in the hopes of maintaining the battery pending a sale, and ended up having to replace the battery because this was useless and the battery died. The car was parked outdoors in full sun all day, every day, but the charger did not manage to produce enough power to keep the battery alive. The wires are also the cheapest quality possible. I snagged one accidentally on the trunk, and it snapped in half with barely any force. AVOID.

Amazing battery maintenance Charger ,

Compatible with my Polaris snowmobile

Most of the time, these seem to keep 12V car batteries charged up, but even with constant direct sunlight, every so often it seems to drain the battery instead of charge it.. I've got 2 of these 5W units installed on vehicles I don't drive much and stay parked outside. Not sure what causes them to flake out and drain the battery every so often but it happens, and then I have to jump them. Not as reliable as a battery tender that is plugged in to line power.