Feature: 1. PEAK 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. 2. MPPT 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. 3. APPLICABLE 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. 4. HIGH 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. 5. MULTIPLE 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. 6. TEMP 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 Controller System Voltage: 12V 24V 36V 48V Auto No Load Loss: 0.4W Solar Energy Maximum Input Voltage: 180V(25), 150V(-25) Battery Voltage: 9-70V Maximum Power Point Voltage Range: Battery voltage +2V-150V Rated Load Current: 20A Conversion Efficiency: 98% MPPT Tracking Efficiency: >99% Temperature Compensation Coefficient: -2mv//2V (default value) Working Temperature: -10-65 Protection Level: IP21 Altitude: 3000 meters. Package List: 1 x Solar Controller1 x User Manual