Please note – Included with your purchase is one WindyNation 30-Watt solar panel. It is recommended that a charge controller is used when charging a 12-Volt battery with a 30-Watt solar panel. A charge controller and cable to connect the solar panel to the charge controller are not included with your purchase. The Windy Nation 30-Watt Solar Panel allows you to start producing free, clean power from the sun. Perfect for keeping 12-Volt batteries charged on RVs, boats, ATVs, cabins and any other situation where you need to keep a 12-Volt battery charged up and ready for use. All of WindyNations solar panels come with a standard 5 year warranty on parts on labor. Additionally, WindyNations solar panels carry a 25 year power warranty which guarantees the solar panel will produce 80% of its rated power output after 25 years. See photo gallery for technical specifications and dimensional drawing.