Review on Fuhuihe 100A MTTP Solar Charge Controller: Intelligent Regulator with LCD Display and Dual USB Port for Home, Industry, Commercial - Overcurrent Protection - Blue by Lawrence Allison

I bought two of these to have a backup unit. None of the devices work properly, which very often causes the voltage to exceed 30V, causing the inverter to shut down and possibly damaging the batteries. The first photo shows a voltage of 29.5V, the second photo shows that the device is set to limit the voltage to 28.4V. The company that made them should be liquidated and boycotted for your own good.