The 7-watt Competition Solar panel helps keep batteries full charged. This portable panel is great for keeping RVs, boats, cars, an ATV batteries charged. The amorphous thin film solar panel technology maintains high performance even in cloudy, hazy and indirect light. Its simple to install basically just hook up its cables to your battery. Extra power and performance for all your charging needs. 15.74-in x 12.5-in x .75-in. Weight 3 lbs.