Features Advanced MPPT scanning technology & effective temperature management, ensuring efficient, reliable and lasting solar DC charge In-built Bluetooth communication module, for APP monitoring and operation in mobile phone Inside glued with polyurethane & silicon mixture, for better device cooling and waterproofing, suitable for installation of solar charge system in RV, yacht, power cabinet and so on. Where you can apply the solar charge controller for? This mppt solar controller is desgined for 12V 24V 36V 48V Solar system. What kind of Battery You can Use it to charge You can use the mppt solar charge controller for FLD, SEL, GEL and lithium Battery Specification Type :MPPT Battery System Voltage :12V 24V/36V/48V Rated Solar Charge Current: 20A Max PV Power :300W/12V ; 600W/24V; 900W/36V;1200W/48V Max PV Voltage: 100Voc No-load Loss: 12mA (12V), 10mA (24V) Operating Temperature: -35C ~ +45C Protection level: IP43 Communication:RS485+Bluetooth APP Controller Dimension:190x120x60mm How to connect solar system with the controller: Step 1: Connect the battery to the solar charge controller : Connect the solar panel to the controller secondly. Pls kindly note there is no output for load. Color: As Shown Material: Plastic+Metal Package Contents: 1 x MPPT Solar Controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.