How to Use: When wiring, connect the positive and negative poles of the battery first, then the positive and negative poles of the solar panel, and finally the positive and negative poles of the load There is anti reverse connection protection inside the controller, but if the connection is wrong, it may still damage the controller Please ensure that the voltage and current used are within the rated range of the controller Specification: Item Type: Solar Charge Controller Material:ABS Product Size: Approx. 13.2 x 10 x 3.2cm / 5.2 x 3.9 x 1.3in Indicator Light: Solar: Charging Status Indicator, Steady Light Means Charging, Flashing Means Entering Floating Charging State. Load: Discharge Status Indicator, when the Load Indicator is On, It Means That the Battery is Allowed to Output, but It Does Not Mean Whether There is Actual Output Current. Battery: Battery Level Indicator Rated Charging Current: 20A System Voltage: 12V 24V Automatic Adaptation MPPT Tracking Efficiency: Maximum 99% Overload and Short Circuit Protection: ≥1.5 Times Rated Current No Load Loss: <10mA Overvoltage Protection: 16V; x2/24V Charge Cut off Voltage: 14.7V; x2/24V Discharge Recovery Voltage: 12.0V; x2/24V Discharge Cut off Voltage: 10.8V; x2/24V USB Output: 5V 1A Working Temperature: -35℃ to+55℃ Scope of Application:Industrial Water, Agricultural Irrigation, Photovoltaic Power Generation, Desert Control Weight: Approx. 375g/13.2oz Package List: 1 x Solar Charge Controller 1 x User Manual