Features 1PEAK TRACKING: Using advanced dual or multi peak tracking technology when the battery board is shaded or damaged multiple peaks will appear on the IV curve and can still accurately track the maximum power point. 2MPPT TRACKING: Built in maximum power tracking algorithm significantly improves the energy utilization rate of photovoltaic systems and can track the optimal working point of the IV curve in an extremely short time. 3APPLICABLE BATTERY: MPPT tracking efficiency can be up to 99% supports sealed acid rich liquid gel and lithium battery and has current limiting charging mode to make it work at rated charging current. 4HIGH EFFICIENCY: The solar controller adopts advanced digital power technology with a circuit energy conversion efficiency of up to 98% and supports capacitive load instantaneous high current startup. 5MULTIPLE FUNCTION: Supports automatic identification of battery voltage fault LCD display convenient for users to determine system faults with lithium battery 0V charging function dual fan cooling system. 6TEMP PROTECTION: Built in over temperature protection mechanism and temperature compensation function automatically adjusting charging and discharging parameters to improve battery service life. Specification Item Type: Solar ControllerSystem Voltage: 12V 24V 36V 48V AutoNo Load Loss: 0.4WSolar Energy Maximum Input Voltage: 180V(25) 150V(-25)Battery Voltage: 9-70VMaximum Power Point Voltage Range: Battery voltage +2V-150VRated Load Current: 20AConversion Efficiency: 98%MPPT Tracking Efficiency: >99%Temperature Compensation Coefficient: -2mv//2V (default value)Working Temperature: -10-65Protection Level: IP21Altitude: 3000 meters Package List 1 x Solar Controller1 x User Manual