I have three of these. All three are connected to the same battery bank, but different solar panels. One does not seem to be working. It communicates with my phone app fine and shows both battery and solar voltage, but no current. It worked fine yesterday, and even made 1.69kWh. I've changed nothing with the system, but it has stayed off today. I've disabled the charger, with the app, and then reenabled it. But, I cannot get it to start charging.