Features The maximum load current/current output is 1A, but you can change the current by changing the value of the Rcs resistor. Complete charge controller for single or multi-cell lithium battery. 1A 3.2-18.5V multi-function battery charger with photovoltaic cell MPPT function. When the battery is absent, it can be used as a voltage source. Automatic charging, battery overvoltage protection. Specification:Item Type: MPPT Solar Panel Controller Module Input Voltage: DC 12-28V Output Voltage: DC 1.2-11V Adjustable (3.6V 4.2V 4.3V 4.35V 8.4V) Input DC 7-28V, Output DC 1.2-21V Adjustable (3.6V 4.2V 4.3V 4.35V 8.4V 12.6V 16.8V 21V) Led Indicator: ''CR'' LED is charge status indicator Ambient Temperature: -40℃ to ＋85℃ Size: 45x20x15mm / 1.77x0.79x0.59in Application: 18V 12V 9V Solar Battery Charging Car Battery Charging Mobile Loadspeaker Electric Bicycle Charger UPS Portable Industrial and Medical Equipment Hand-Held Equipment Emergency Lamp and Camping Lamp Battery-Backup System Standalone Chargers for Lithium ion, LiFePO4 or Lithium Titanate Batteries Package List:1 x MPPT Solar Panel Controller Charge Module Package List 1 x MPPT Solar Panel Controller Charge Module