Specification: Item Type: Solar Charge Controller Material: ABS Model: K1688 Colour: Blue System Voltage: 12V or 24V automatic adaptation. Maximum Photovoltaic Voltage: 50V USB Output: 2 USB outputs, 5V 2.5A (maximum). Boost Charging Voltage: 14.4V Floating Voltage: 13.7V (default value, adjustable). Discharge Cut Off Voltage: 10.7V (default value, adjustable). Discharge Recovery Voltage: 12.6V (default value, adjustable). Charging Recovery Voltage: 13V Standby Current: <10mA Working Temperature: -35~+60℃ Maximum PV Input Power 10A 20A 30A Rated Voltage(12V or 24V) 130W(12V) 260W(24V) 260W(12V) 520W(24V) 390W(12V) 780W(24V) Package List: 1 x Solar Charge Controller 1 x User Manual Note: Recommendations for Safe Use: 1. This controller automatically recognizes 12V or 24V. When installing for the first time, please make sure that the battery has enough voltage so that the controller can recognize the correct battery type. 2. Install the controller as close to the battery as possible to avoid voltage drop caused by excessively long wires and affect normal voltage judgement. 3. This controller is only suitable for various LA batteries (including openings, seals, gels, etc.). 4. This controller can only use photovoltaic panels as the charging source. Do not use DC or other power sources as the charging source. 5. The controller will heat up when it is running, please pay attention to install the controller on a flat, well ventilated surface.