Blue Sky Energy, Solar Boost 50L, MPPT Charge Controller, 50 Amp, 12/24 Volt, No Display, SB50L (shown with optional remote display and front cover display)

The Blue Sky Energy Solar Boost features reverse-polarity protection, MPP tracking and selectable-charge voltage for flooded and gel lead-acid batteries. An equalize function periodically conditions liquid electrolyte
lead-acid batteries. An optional user-friendly digital display is available to monitor PV charge performance. The display shows battery voltage, solar current, charge current and charge mode, either in the controller, as a remote panel installed up to 300 feet away, or both. Optional temperature compensation of charge voltage is also available to further improve charge controller and battery performance. Solar Boost controllers available with or without digital display and optional remote display. 3-year limited warranty.

Solar Boost 50L
This charge controller can be used on 12- and 24-volt systems. It can also be used to charge a 12-volt battery from a 24 volt array.
Maximum open-circuit PV array voltage is 57 VDC.