Solar Charge Controller for managing battery charging which helps to increase a batteries by preventing overcharging.Batteries must be 12V or 24V. Controller does not charge a 12V and 24V battery.Built in Industrial Microcontroller.State of charge (SOC) showing battery condition.Pulse Width Modulation with four of charging.Short circuit, Reverse current, Reverse polarity, Overcharge protection.Fine workmanship and good performance.Easy to use.Long service life.Current: 20ASystem voltage: 12V/24V adaptiveMaximum photovoltaic voltage: 41VVoltage drop of charging circuit: Less than 0.2VBoost charging voltage: 14.6V (only for 12V system, if using 24V system, please x2)Direct charging voltage: 14.5V (only for 12V system, if using 24V system, please x2)Constant voltage charging voltage: 14.2V (only for 12V system, if using 24V system, please x2)Float voltage: 13.8V (only for 12V system, if using 24V system, please x2)Charging recovery voltage: 13.0V (only for 12V system, if using 24V system, please x2)Adjustment : PWMStandby current:Less than 10mATemperature Compensation: Working temperature: -35~+60Colour:As ShownMaterial:plasticPackage Contents:1 x Solar Charge ControllerOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.