Specifications: Adopt industrial-grade main control chip. Large-screen LCD display with 5V USB charging function. Complete PWM charging management. Built-in over-current/short-circuit protection, open-circuit protection, and reverse connection protection, all of which are self-healing and do not damage the controller. Dual MOS anti-backflow circuit, ultra-low heat. Recommendations for safe use: This controller automatically adapts to 12V/24V (or 48V). When installing for the first time, please make sure that the battery(not included) has enough voltage so that the controller can recognize the correct battery type. Install the controller as close to the battery as possible to avoid the voltage drop caused by the excessively long wires and affect the normal voltage judgment. This controller can only use photovoltaic panels as the charging source, do not use DC or other power sources as the charging source. The controller will heat up when it is running, please be careful to install the controller on a flat, well-ventilated surface. Connect the positive and negative poles of the battery to the controller as shown, and the controller will automatically detect the battery voltage. Connect the positive and negative poles of the load to the controller as shown in the figure, and be careful not to reverse them. Connect the solar panel to the controller as shown. Please strictly follow the above sequence for access, otherwise the controller may be damaged. Item Name: Solar Charge Controller System Voltage: 12V/24V Rated Charging Current: 10A-30A Rated Discharge Current: 10A-30A Maximum Photovoltaic Voltage: < 50V Floating Voltage: 13.7V Discharge Cut-off Voltage: 10.7V Discharge Recovery Voltage: 12.6V USB Output: 5V/0.8A Standby Current: < 10mA Working Temperature: -35 to 60 Degree Celsius Size: 15cm x 7.8cm x 3.5cm/5.91" x 3.07" x 1.37" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Solar Charge Controller 1 x User Manual