Features MPPT Functionality Ensures Efficient Charging perience optimal energy conversion with the advanced MPPT function, maximizing solar power utilization for your lithium battery charging needs Versatile Battery Compatibility is complete charge controller is designed for single or multi-cell lithium batteries, offering flexibility for various solar power setups Features: 1、1A 3.2-18.5V multi-function battery charger with photovoltaic cell MPPT function. 2、Complete charge controller for single or multi-cell lithium battery. 3、The maximum load current/current output is 1A, but you can change the current by changing the value of the Rcs resistor. 4、When the battery is absent, it can be used as a voltage source. 5、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