12V 24V Dual USB Solar Charge Controller PWM Photovoltaic Solar Panel Charge Regulator with LCD Display 20A Item Type: Solar Charge Controller Material: ABS Gross Weight: 202g / 7.1oz Product size: 12.5x10x3cm / 4.9x3.9x1.2in Model: K1688 System Voltage: 12V 24V automatic adaptation Maximum Photovoltaic Voltage: 23V at 12V battery; 46V maximum at 24V battery Lifting Charge Voltage: 14.4V (12V), 28.8V (24V) Float Charging Voltage: 13.7V (default, adjustable) (12V), 27.4V (default, adjustable) (24V) Discharge Cut Off Voltage: 10.7V (default, adjustable) (12V), 21.4V (default, adjustable) (24V) Discharge Recovery Voltage: 12.6V (default, adjustable) (12V), 25.2V (default, adjustable) (24V) Charging Recovery Voltage: 13V (12V), 26V (24V) Light Controlled Light On Threshold: 8V for photovoltaic panel (with delay for light control lamp on) (12V), 16V for photovoltaic panel (with delay for light control lamp on) (24V) Light Controlled Light Off Threshold: 8V for photovoltaic panel (delay for light control switch off) (12V), 16V for photovoltaic panel (delay for light control switch off) (24V) USB Output: 2 way USB output, 5V 2.5A (maximum) Standby Current:<10mA Working Temperature: - 35-+60 ℃ Purpose: Solar controller