MPPT Solar Controller Panel Regulator Photovoltaic Charge Discharge Controller 12V 24V 36V 48V 30A 20V Item Type: Solar Controller Material: Cast Aluminum, PC Maximum Input Voltage: 150V (at minimum temperature), 138V (at standard 25℃) System Voltage: 12V 24V 36V 48V Self Identification Self Loss: 35mA (48V) MPPT Maximum Accuracy: 99% Maximum Charging Efficiency: 97% Charging Control Mode: Multi Stages (MPPT, absorption, floating, equalization, CV) Float Charging: 13.8V 27.6V 41.4V 55.2V Absorption: 14.4V 28.8V 43.2V 57.6V Equalization: 14.6V 29.2V 43.8V 58.4V Undervoltage Protection: 10.8V 21.6V 32.4V 43.2V Undervoltage Recovery: 12.6V 25.2V 37.8V 50.4V Load Control Mode: Normal time control, optical control, optical time control, timing control, reverse optical control Light Control Point Voltage: 5V 10V 15V 20V Battery Type: Gel battery, acid maintenance free, and user defined, lithium battery 3 strings 3.7V, 4 strings 3.7V, 4 strings 3.2V, 5 strings 3.2V Operating Temperature Range: -20℃ to 55℃ Storage Ambient Temperature: -30℃ to 80℃ Humidity: 10%-90% without condensation