Product Introduction: This product can real-time detect the power of solar panels, and track the highest voltage current value(V), make the system with maximum output for battery charging.Used in off-grid solar pv system, coordinate the efforts of solar panels, battery, load, is the core of off-grid pv system control unit. This product USES LCD operation state, running parameters and control parameters, etc.The user can through the button to refer to various parameters, and can according to need to modify the control parameters to adapt to the different system requirements. Controller inside has a comprehensive electronic fault self-test function and powerful protection function, can avoid to the greastest extent Can automatically adapt to 12V/24V/36V/48V voltage Energy conversion rate of up to 95% Made of aluminum plus dual fan cooling, lower temperature rise With buttons for easy operation Protection class is IP21 Charging current: 40A size: 18.8 x 24.2 x 6.7cm Material: ABS+aluminum colour: black Package Contents: 1 x 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.