Review on High-Efficiency 60A MPPT Solar Charge Controller for Various Battery Types - 12V to 48V Auto, Positive Ground, LCD Display by Dennis Goozmer

Thought it was DOA when it wouldn't turn on. Error contacting technical support via email. Since the previous controller failed, my batteries dropped to 10 volts, not enough to turn it on. Tried another battery and it worked fine. It's ok if you just need to control the solar energy.