Feature:1. PWM solar controller, with dual reverse current protection, low heating generation.2. Support 12V/24V automatic identification, ultra‑wide charge and discharge adjustable.3. Designed for charging lead‑acid, ternary lithium, and lithium iron phosphate batteries.4. Built‑in short circuit protection, open circuit protection, reverse connection protection, overload protection.5. Battery charge controller, rated charging current is 40A and rated discharge current is 20A.Specification:Item Type: Solar Charge ControllerMaterial: PlasticWeight: Approx. 145g / 5.1ozProduct Size: Approx. 13.3x7cm / 5.2x2.8in System Voltage 12V/24V automatic recognition (no power storage function) Rated Charging Current 40A Rated Discharge Current 20A Battery Type Maximum Photovoltaic Voltage When the battery is 12V, the maximum voltage is 23V, when the battery is 24V, the maximum voltage is 46V Battery Type Lead-acid battery/lithium ion battery (ternary lithium)/lithium iron phosphate battery Charging Cut-Off Voltage Lead-Acid Batteries The default value is 14.4V (not adjustable) Ternary Lithium Battery The default value is 12.6V (not adjustable) Lithium Iron Phosphate Battery The default value is 14.6V (not adjustable) Discharge Recovery Voltage Lead-Acid Batteries The default value is 12.6V (adjustable 11.5V-13V) Ternary Lithium Battery The default value is 10.5V (adjustable 10V-11V) Lithium Iron Phosphate Battery The default value is 12.0V (adjustable 11.5V-12.5V) Discharge Cut-Off Voltage Lead-Acid Batteries The default value is 10.7V (adjustable from 9.5V to 11.5V) Ternary Lithium Battery The default value is 9.0V (adjustable from 8.5V to 9.5V) Lithium Iron Phosphate Battery The default value is 10.0V (adjustable from 9.5V to 10.5V) Float Voltage Lead