The Rover Charge Controller is a power packed controller suitable for numerous off-grid applications. This high efficiency Mppt controller guarantees you the highest efficiency, up to 99%. Furnished with several features, the Rover has an LCD screen with programmable parameters, giving you the power to adjust your settings. One of the most desired features of this unit is the error code detection. When issues arise, you can self-diagnose your 40 amp controller by simply looking up the error code shown. Made with a die-cast, aluminum design for heat dissipation and 4-stage battery charging algorithm, the Rover 40 amp charge controller is the perfect addition to any solar power system!