My 100/50 controller has been working flawlessly. One day, it failed to charge, even though there was plenty of sun and my batteries needed it. The app indicated that the controller status was OFF and that the panel voltage was lower than the battery level, which didn't make sense. I removed the panel wires at the controller and saw that the panels were providing over 20 volts, and not the 12+ volts that the app indicated. I unplugged the panels and batteries from the controller, waited, then reconnected everything. The controller immediately started to work properly, charging my batteries, and worked fine for a couple of weeks...until today.
Today, the app indicated the earlier problem. My batteries were in the neighborhood of 12.50 volts, and the app indicated that the panels were only providing something like 12.47 volts, even though it was very sunny. I again disconnected the panel input wire right at the controller and saw that the panels were actually providing well over 20 volts. I again disconnected both the panel input and batteries from the controller, waited, and reconnected everything, however the controller still won't charge and the app is indicating that the panel voltage is again just under the battery voltage. Thoughts?