Specification: Item Type: Solar Charge Controller Material: ABS Gross Weight: 202g/7.1oz Size: 12.5x10x3cm/4.9x3.9x1.2in Model: K1688 System Voltage: 12V, 24V automatic adaptation Rated Discharge Current: 10A 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 Threshold Value of Light Control Lamp on: 8V for photovoltaic panel, with delay for light control lamp on, 12V; 16V for photovoltaic panel, with delay for light control lamp on, 24V Threshold Value of Light Control Switch Off: 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 to +60 ℃ Maximum Photovoltaic Input Power: 390W, 12V; 780W, 24V Package List: 1 x Solar Charge Controller 1 x Manual Features LCD Display: Display charging and discharging current; query of accumulated electricity generated and discharged; temperature display; optical control and delay control; the charging and discharging parameters are flexible; with power off memory and ot Dual USB Output: This photovoltaic power controller has dual USB output, maximum current up to 2.5A, supporting for Phone charging. And it has complete three phase charging management. Multiple Protections: Built in over current, short circuit protection, open circuit protection and reverse connection protection are all self recovery type, without damaging the controller. Industrial Grade Control Chip: This solar panel regulator has industrial grade master control chip, and it has anti backflow circuit, ultra low heat. Note: Connect the positive and negative poles of the load to the controller as shown in the manual, and be careful not to connect them reversely.