Solar Charge Controller PWM Lithium Battery Photovoltaic Charge Regulator LCD Display 12V/24V20A Item Type: Solar Charge Controller Supported Battery Type: B1: Acid battery 12V/24V (automatic identification) B2: Lithium ion battery (lithium battery) 3 strings of 3.7V=11.1V B3: LiFePO₄ battery 4 strings of 3.2V=12.8V System Voltage: 12V/24V automatic adaptation Maximum PV Voltage: Up to 23V at 12V; up to 46V at 24V Charge Cut off Voltage: 14.4V(B1) 12.6V(B2) 14.6V(B3) Discharge Cut off Voltage: 10.7V(B1) 9V(B2) 10V(B3) Discharge Recovery Voltage: 12.6V((B1) 10.5V(B2) 12V(B3) Light Control Turn on Threshold: Photovoltaic Panel 8V Light Control Turn off Threshold: Photovoltaic Panel 8V USB Output: 2 way USB output, 5V/2.5A (maximum) Standby Current: <10mA Working Temperature: -35~+60℃