This NPower 15 Watt amorphous solar panel provides excellent performance even in cloudy conditions. It charges 12V car, truck, motorcycle, ATV, boat, personal watercraft or RV batteries. Ideal for deep cycle or multiple battery banks. Each panel provides 15 Watts of power; link up to 7 panels to produce additional wattage. Application: Charging 12V batteries, Watts: 15, Dimensions L x W x H (in.): 42 1/2 x 3 x 16, Material: Amorphous solar cell, Panels (qty.): 1, Battery Included: No, Includes: Panel, mounting screws, battery clamps, 12V plug Wiring included 42 1/2in.L x 3in.D x 16in.W Requires charge controller, Item# 121182 (sold separately)