Features Multi-Function Charging Capability: Features a 1A charging current for 3.2-18.5V batteries, ensuring versatile compatibility with various lithium battery types Comprehensive Battery Management: Functions as a complete charging controller for Li-ion, LiFePO4, and lithium titanate batteries, enhancing performance and lifespan Adjustable Output Current: Customize the maximum load current up to 1A by changing the Rcs resistor value, providing flexibility for different applications Versatile Voltage Source: Operates as a voltage source when the battery is absent, making it ideal for various solar power setups and ensuring continuous energy supply Advanced Battery Protection: Automatically conditions deeply discharged batteries and provides overvoltage protection for safe and efficient charging operations Features: 1、1A 3.2-18.5V multi-function battery charger with photovoltaic cell MPPT function. 2、Complete charging controller for single or multiple Li-ion, LiFePO4 or lithium titanate batteries. 3、The maximum load current / output current is 1A, but you can change the current by changing the value of the Rcs resistor. 4、Can be used as voltage source when battery is absent. 5、Automatic conditioning of deeply discharged batteries. 6、Automatic recharge, battery overvoltage protection. Specification: Item Type: Solar Panel MPPT Controller Charging Module Option: 9V, 18V 9V (for 9V Solar Panel): Input DC 9-28V, Output DC 1.2-8V Adjustable (3.6V 4.2V 4.3V 4.35V 7.2V) 18V (for 18V Solar Panel): Input DC 18-28V, Output DC 1.2-17V Adjustable (3.6V 4.2V 4.3V 4.35V 8.4V 12.6V 16.8V) MPPT Disable (Change R5 to 12KΩ, it is recommended to buy DD28CRTA): 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 Operating Ambient Temperature: -40℃ to ＋85℃ Package List: 1 x Solar Panel MPPT Controller Charging Module Package List 1 x Solar Panel MPPT Controller Charging Module