Item Type: Solar Panel MPPT Controller Charging Module <br>Option: 9V, 18V <br>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) <br>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) <br>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) <br>LED indicator: ''CR'' LED is charge status indicator <br>Operating Ambient Temperature: -40℃ to ＋85℃<br>1、1A 3.2-18.5V multi-function battery charger with photovoltaic cell MPPT function. <br>2、Complete charging controller for single or multiple Li-ion, LiFePO4 or lithium titanate batteries. <br>3、The maximum load current / output current is 1A, but you can change the current by changing the value of the Rcs resistor. <br>4、Can be used as voltage source when battery is absent. <br>5、Automatic conditioning of deeply discharged batteries. 6、Automatic recharge, battery overvoltage protection.1 x Solar Panel MPPT Controller Charging Module