Features: Large-screen LCD display, adjustable charge and discharge parameters, with power-off memory function Uses industrial-grade master chip Complete 3-stage PWM charging management Dual USB output, maximum current up to 2.5A, supports mobile phone charging Dual MOS anti-backflow circuit, ultra-low heat generation Built-in over-current, short-circuit, open-circuit, and reverse connection protection; all protections are self-healing and do not damage the controller Package Includes: 1 x Solar Charge Controller Specifications: Material: ABS Current Rating: 10A / 20A / 30A / 40A / 50A / 60A Size: Approx. 133.5 x 70mm / 5.26 x 2.76 inches System Voltage: 12V / 24V Maximum Photovoltaic Voltage: 23V for 12V battery; 46V for 24V battery Battery Type: B1 = Automatic identification of lead-acid battery 12V / 24V B2 = Lithium-ion battery (3.7V x 3 = 11.1V) B3 = Lithium iron phosphate battery (3.2V x 4 = 12.8V) Charging 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 (with delay) Light Control Turn-off Threshold: Photovoltaic panel 8V (with delay) USB Output: 2 x USB, 5V / 2.5A maximum Standby Current: Low power consumption