GHB 20A 12V 24V Solar Charge Controller Auto Switch LCD Intelligent Panel Battery Regulator Charge Controller Overload Protection Temperature Compensation LCD Screen Display &gt;&gt; This solar panel charger controller with LCD to display all parameters, the LCD has rich contents, the users can intuitively know the working condition of the controller. The LCD display is with built-in energy-saving backlight LCD, display better, more clear, more beautiful, more modern and more power-efficient. Fully Automatic &gt;&gt; This solar panel regulator with output switch, intelligent control, easy to operate,to connect the controller and the battery by cables with right polarity. The battery indicator light on the controller will be on if successfully connected, otherwise, to check and reconnect. Power-efficient &gt;&gt; Microcontroller digital accuracy, when it's charging,the arrow between the panel icon and the battery icon will be flashes fastly,when the battery was full charge,it will be slow flashed,will stop charging,the function of the controller is to protect the voltage overshoot and discharge. Available for DC lamp and phone charging. A key to open and close the load. Rated Discharge Current &gt;&gt; Solar charge controller 12V 20A; USB Output Voltage: 5V; Total USB Output Current: 3A; DC Output Voltage: 12V. To connect your load and the cables with right polarity and then connect with the load output port of the controller. Pay special attention to + - polarity to avoid reversed connection, otherwise, your load may be damaged. Protection Functions &gt;&gt; Overload and Short circuit protection, Lightning protection, Under-voltage protection, Over-charging protection, Reverse Polarity protection charge controllers for solar panels. Use PWM&WPC mode, improve system efficiency and prolong the life span of the battery. Over-load protection Short circuit protection Lightning protection Under-voltage protection Over-charging protection Reverse Polarity protection