The Cyclops Solar Solutions 2 W 12 V Amorphous Solar Panel Battery Maintainer is ideal for cars, personal water craft & ATVs. It will conserve 12 V batteries with solar power. The panel efficiently charges in all weather conditions including overcast weather and has a maximum current up to 2 W/100 mAh per hour. It will prevent the natural voltage drain off batteries over time and is also easy to install. The charger plugs into your vehicle's 12-V power socket.