I first witnessed the inverter fault while in storage, then it happened again during day 1 of a camping trip. Then, as you suspect, the batteries were discharged quite a bit by the next day and I was not at the setpoint (14.6V at that time with temp compensation still occurring at cool temps). No faulting observed in the discharged situation.
All the programming and investigating I've done has been since we got home from that trip and had things stored at home.
It is true that I may have made several charging program settings to work around a situation that is unlikely to occur during most of a camping trip.
