The Grape Solar 400-Watt Off-Grid Solar Panel Kit is ideal for a variety of applications, including emergency backup systems, RVs, boats, 12 Volt battery charging, small pumps, charging small electronic devices and operating LED lights. Made with high efficiency crystalline solar cells for years of service, this solar kit is easy to install and virtually maintenance free! An anodized aluminum frame and a sealed junction box make the panel weatherproof for outdoor use. Two blocking diodes prevent reverse current flow. This system will provide approximately 1,200 Watt Hours or 100 Amp Hours of charge per day. The kit includes: 4 pc 100-Watt polycrystalline solar panels, a 35 Amp charge controller, 1,800-watt inverter with two outlets and 1 USB port, cables and manual.