These work great, have one on the mower and one on a van rarely used, easy install if cigarette lighter plug is constant on.

I have a battery maintainer from Harbor Freight that is a plug in. We park the truck away from house and thought this solar powered battery maintainer would be better. So for it’s not working as I hoped for.

Does not work unless vehicle key is in the ignition. Theft hazard! It would not charge phone, speaker, or lithium battery pack.

The product is excellent. Easy to use. Extends battery life on your vehicle. Charges directly in the sun.

2nd one I got, last one for my trailer this one for my tractor

Got them for gifts and everybody loves them! Unique gift. Highly recommend!

I bought this to keep the battery in my classic Cobra charged in the off season when it doesn’t get run very much. Does a great job just stuck to the garage door window. I dropped it accidentally and it wasn’t even scratched. I highly recommend!

defective after 2 months of use.

My car (2020 Corolla) cuts power to the lighter socket when the car is off so this won’t work with that. My solution was to get a fuse tap and crimp an SAE connector to that. Works fine apart from the panel complaining about reversed polarity when the SAE connector is attached to the fuse tap/ground as you would expect (solid red light). Once reversed it worked fine (blinking red light).

I used to have to start my small car twice a day in the bitter cold, just to charge up the battery, and sometimes I had to jump it. I bought the 10W version. In hindsight, I wish I bought the 12W, but the 10W works fine. I rigged up a dashboard holder using Styrofoam and cardboard, and connected it to the car’s OBDII port with this adapter: https://www.amazon.com/dp/B007KJ2RZK. I park outside, where the panel gets about three hours of direct sunlight and a few more hours of ambient light. I let the car sit for a couple of days in below-zero temperatures and it started! No more dead batteries in the winter!