Item Type: PWM Solar Controller Material: ABS Use: Applicable to home, industry, commerce, etc. Rated Voltage: 12, 24V Automatic identification Rated Discharge Current: 10A Maximum PV Voltage: Up to 23V for 12V battery Up to 46V for 24V battery Battery Type: B1=acid battery 12V,24V battery automatic identification B2=Lithium ion battery (lithium battery) 3 strings of 3.7V=11.1V B3=Lithium iron phosphate battery 4 strings of 3.2V=12.8V 12V Charging Cutoff Voltage: 14.4V (B1) 12.6V (B2) 14.6V (B3) (red font is for 12V, parameter multiplied by 2 for 24V) 24V Charging Cutoff Voltage: 28.8V (B1) 12.6V (B2) 14.6V (B3) 12V Discharge Cutoff Voltage: 10.7V (B1) 9V (B2) 10V (B3) 24V Discharge Cutoff Voltage: 21.4V (B1) 9V (B2) 10V (B3) 12V Discharge Recovery Voltage: 12.6V (B1) 10.5V (B2) 12V (B3) 24V Discharge Recovery Voltage: 25.2V (B1) 10.5V (B2) 12V (B3) 12V Light Control On Light Threshold: PV panel 8V (light control on light with delay) 24V Light Control On Threshold: PV panel 16V (light control on with delay) 12V Light Control Off Threshold: PV panel 8V (light control off with delay) 24V Light Control Off Threshold: PV panel 16V (light control off with delay) USB Output: 2 way USB output, 5V/2.5A (maximum) Standby Current: