ITEM NAME:20W 12V Solar Power Panel Battery Charger For Car Motorcycle Boat Yacht Tractor Description: It can be used as an alternative charger for automobiles,truck, caravans, tractors, boats, motorcycles, travelling, camping, RV batteries or any 12V lead acid battery. Mono-crystalline silicon panel can work in all daylight.Rated Maximum Power (Pmax): 20W. First, the solar panel surface of the solar panel faces the sun, and the back USB output surface has a red light indicating that the current output is normal. 1 Piece Solar Cells.