Use the Midas 40A MPPT Solar Charge Controller from ACOPower to recharge your 12V or 24V batteries safely and efficiently with renewable solar energy. This negative-ground controller offers tracking efficiency up to 99.5% and peak conversion efficiency of 98% It can be used with flooded, sealed, gel, and Li-ion batteries. The plug-and-play controller is easy to use and automatically detects the solar panel voltage to deliver bulk, boost, float, and equalization charging.