Use - it is almost a complete mesh solar system, the only component you need is a battery to save energy. It can be used for charging DC 12V devices in car, camper, boat, camping. Approx. solar panels power 150W 12V. Mono Solar Panels are convenient to use in combination with the 12 Volt Battery Charging or multiple elements can be connected in series, with 24/48 Volt battery or charger for grid-tied applications. Easy Installation with pre-drilled hole. This is an essential kit and connects all devices.