Review on ⚡ Efficient 20W Solar Panel Car Battery Charger: Portable, Waterproof, Ideal for Car, Boat, RV | POWISER by Joseph Hernandez

I use this product to charge and maintain the 12v battery in my 2007 Hyundai Elantra. My battery was not fully charged due to a plug problem. I chose the Powiser 20w solar charger/maintainer over the 5w and 10w for faster charging. After a simple installation, it fully charges the car battery and supports parking or driving as long as the sun shines. I installed a solar panel with cigarette lighter adapter on the rear window of a car and plan to permanently connect directly to the car battery. When I emailed Powiser with questions, I received an almost immediate response with helpful information and suggestions tailored to my specific circumstances. I had to start the car every 2 days to avoid draining the battery. Powiser solved my battery problem. I recommend the Powiser 20w solar unit.