Magnum Energy MSH3012M MSH-Series 3000W 12VDC Pure Sine Hybrid Inverter Charger, Transfer relay capability 60 AAC, Five stage charging capability, Overcurrent protection, Overtemperature protection Five stage charging capability (Bulk, Absorb, Float, Equalize, and Battery Saver) Internal cooling 0 to 120 cfm variable speed drive using dual 92mm brushless DC fans Overcurrent protection with two overlapping circuits Overtemperature protection on transformer, MOSFETS, and battery Lightweight aluminum base and cover also provides noise reduction and corrosion resistance