This complete, land-based system is ideal for producing maintenance-free backup power and 12V battery charging. Provides reliable solar power even in cloudy or overcast conditions and temperatures from ?40° to 176°F. Includes everything you need to connect to your existing 12V battery, including four, 41"H x 17"W 15-Watt panels, sturdy mounting frame (38-1/2"H x 57"W x 2-1/2"D), 7-Amp charge controller, 200-Watt inverter, all necessary connecting cables and complete instructions.