Excellent performance even in cloudy conditions. Charges 12 Volt car, truck, motorcycle, ATV, boat, personal watercraft or RV batteries. Ideal for deep cycle or multiple battery banks. Application: Car, truck, motorcycle, boat, Watts: 15, Dimensions L x W x H (in.): 38 x 13 x 1/2, Panels (qty.): 1 Each panel provides 15 Watts of power Link up to 7 panels to produce additional wattage Wiring included Requires charge controller (sold separately) Dimensions: 38in.L x 13in.W x 1/2in.H