This DC 2 DC 40+AMP BATTERY CHARGER/ MPPT REG is specifically designed for a DUAL BATTERY SYSTEMS. It has two totally independent DC Inputs for both engine and solar regulation charging one house battery bank output. It is equipped with DC M6 screw terminals that allow for large battery cable connection between all sources. It also features a dedicated Maximum Power Point (MPPT) solar regulator, and the same battery algorithms as included in our AC mains ePOWER battery charger. This charger is suitable for Gel, AGM, and other battery types.