These LCB pump controllers utilize MPPT (maximum power point tracking) and are perfect for controlling all Slowpump, Solar Force, Shurflo and Solarjack SDS DC pumps, as well as fans and blowers. They feature a lockable weatherproof enclosure, built-in fuse, remote float switch capability and LED indicators. The 12/24 v models allow for a higher voltage array (up to 36 volts) to power a 12 or 24 v pump, for longer wire runs. Over 94% efficient.