300W 12V USB Solar Panel Kit with Controller, 10-60A Solar Battery Charger for Car, Yacht, RV, Boat, Cell Phone Charger. Controller connection steps (see the figure above). Connect the positive and negative terminals of the battery as shown. The controller will automatically detect the battery voltage. Connect the solar panel to the controller. Connect the load as shown, do not respond reversely. Note: Strictly follow the wiring shown, otherwise a short circuit may occur on the controller. The disassembly order is opposite to the connection order. Features: Made of high-quality materials, environmentally friendly, durable, and exquisite. The conversion rate is high. Dual output solar panel with USB interface to meet all your needs. Environmental protection and no pollution, enables the conversion of solar energy into electrical energy. Wide range of applications, can be used in many places such as cars, small household appliances, etc. A solar panel is a device that converts solar