The grape solar 400-watt off-grid solar panel kit is ideal for a variety of applications, including 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. A two diode bypass minimizes power drop caused by shade. You can easily add additional panels for more power. This system will provide approximately 1,200-watt hours or 100 amp hours of charge per day. The kit includes: 4-piece Grape Solar GS-STA-100W 100-watt Polycrystalline solar panels, a 40 amp GS PWM-COMET charge controller, and 1,800-watt Pure Power inverter with two outlets, and 1 USB port, cables and manual.