When you need to charge your boat or RV battery, rely on the Nature Power 18 Watt Amorphous Solar Panel. Utilizing solar power, these panels work in all lighting conditions and are easy to set up. Build with a durable aluminum frame, this item includes built in blocking diode, battery clamps, tilt mounting poles, and mounting brackets and screws. The Nature Power 18 Watt Amorphous Solar Panel comes with a 5 year manufacturer's warranty from the date of purchase and must be used in conjunction with Nature Power 8 Amp Charge Controller or Nature Power 28 Amp Charge Controller. Product Specifications Solar Panel Type: Amorphous thin film Voltage: 12 Volts DC Maximum Power: up to 18 Watts Maximum Current: up to 1200 mA Dimensions Each: 12½x1½x36” Weight Each:8 KGS.