Specification: Name: Solar Controller Material: ABS + PP + aluminum heat sink Charging method: MPPT automatic maximum power tracking Lead-acid battery: (12V/24V/36V/48V) Gel battery: 12V/24V/36V/48V Phosphate battery: cell voltage 3.2 * number of strings (2 strings-18 strings adjustable) Ternary battery: cell voltage 3.7 * number of strings (2 strings-18 strings adjustable)   Photovoltaic maximum opening circuit input voltage: 0--230V Start charging: Photovoltaic voltage is greater than battery voltage +3V (low current charging is also possible on rainy days) Working temperature: -20°C--40°C IP protection level: IP 21 Altitude: 3000m Size: 13.2 * 6.1 * 22.8cm Color: Orange + Blue   Packing included: 1 * Solar Controller