Feature:1. For Off Grid System: The controller is designed for off grid solar photovoltaic system, used to coordinate the operation of solar panels, batteries and loads.2. High Efficiency: Built in MPPT algorithm, the tracking efficiency is up to 99.9%, and energy conversion efficiency is improved to 98%, the charging efficiency is improved by 15% to 20% compared with PWM method.3. Widely Compatible: Can provide charging options for different types of batteries, including gel batteries, sealed batteries, elastic batteries, lithium batteries, etc.4. Limited Current Charging: When the power exceeds a certain level and charging current is greater than rated current, the controller will automatically reduce charging power to make charging current achieve rated value.5. LCD Display: LCD screen can dynamically display the operation status, operation parameters, controller log, control parameters, etc.6. Easy Operation: Adopt standard communication protocol, users can easily check and modify system parameters. Free monitoring software is provided to meet users' needs for remote monitoring.7. Powerful Protection: With comprehensive electronic fault self detection function, built in powerful electronic protection function, avoid component damage caused by installation error or system fault.Specification:Item Type: MPPT Solar Charge ControllerMaterial: Aluminum Alloy, PCBattery Voltage: 12V 24V (Automatic)No Load Loss: 0.7-1.2WBattery Voltage: 9-35VRated Charging Current: 40ARated Discharge Current: 20APhotovoltaic System Maximum Power: 550W (12V), 1100W (24V)Communication Mode: RS232 RS485Solar Panel Maximum Voltage: 100V (25), 90V (-25)Altitude: 3000m.Package List:1 x MPPT Solar Charge Controller1 x Temperature Sensor1 x English Manual