Features 1.Solar controller, 12V/24V automatic identification, ultrawide charge and discharge adjustable. 2.Can charge 3 kinds of batteries, leadacid, ternary lithium, and lithium iron phosphate batteries. 3.Support dual reverse current protection, low heat generation, stable performance. 4.With short circuit protection, open circuit protection, reverse connection protection, overload protection. 5.Support 2 USB outputs, maximum 5V/2A, rated charging current is 20A. Specification Item Type: Solar Charge Controller Material: Plastic Weight: Approx. 151g / 5.3oz Product Size: Approx. 13.3x7cm / 5.2x2.8in System Voltage12V/24V automatic recognition (no power storage function) Rated Charging Current20A Rated Discharge Current10A Battery Type Maximum Photovoltaic VoltageWhen the battery is 12V, the maximum voltage is 23V, when the battery is 24V, the maximum voltage is 46V Battery TypeLead-acid battery/lithium ion battery (ternary lithium)/lithium iron phosphate battery Charging Cut-Off VoltageLead-Acid BatteriesThe default value is 14.4V (not adjustable) Ternary Lithium BatteryThe default value is 12.6V (not adjustable) Lithium Iron Phosphate BatteryThe default value is 14.6V (not adjustable) Discharge Recovery VoltageLead-Acid BatteriesThe default value is 12.6V (adjustable 11.5V-13V) Ternary Lithium BatteryThe default value is 10.5V (adjustable 10V-11V) Lithium Iron Phosphate BatteryThe default value is 12.0V (adjustable 11.5V-12.5V) Discharge Cut-Off VoltageLead-Acid BatteriesThe default value is 10.7V (adjustable from 9.5V to 11.5V) Ternary Lithium BatteryThe default value is 9.0V (adjustable from 8.5V to 9.5V) Lithium Iron Phosphate BatteryThe default value is 10.0V (adjustable from 9.5V to 10.5V) Float VoltageLead-Acid BatteriesThe default value is 13.7V (adjustable from 13V to 15V) Ternary Lithium BatteryThe default value is 12.0V (adjustable 11.5V-12.5V) Lithium Iron Phosphate BatteryThe default value is 13.8V (adjustable from 13V to 14.5V) USB Output2 USB Outputs, Maximum 5V/2A Stand-By Current