The grape solar 540-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.