This is a set of highly efficient monocrystalline solar panels, charging controller, and dedicated cables that convert sunlight to power. This product is especially recommended for those who have a battery. Simply place the solar panel in a location with good sunlight conditions and connect the included charge controller or cable to the battery to charge and store the solar powered power into the battery. 36 V single crystal solar panel allows you to charge one 24 V battery. The monocrystalline solar panel is highly efficient to convert sunlight to power and generate electricity even when cloudy The Charge Controller is a device that controls current to prevent overcharging, short circuit, and other troubles when charging or storing power from the solar panel during the day. * Charge controller and cable are attached to the back of the solar panel to prevent water from rain. Detailed instruction manual is included, so anyone can use it easily. If you have any questions, please feel free to contact us.