Since November 2022 I run an AC300+2xB300 system. It is chrged by PV only. It worked for several week, by charging the batteries, then turning on the AC outputs and use the power to run a fridge.
After a few weeks I suddenly cannot turn on the AC / DC output in the display. I even cannot acitvate bluetooth to update the firmware. Also resetting the whole system to default does not work. I can go through the individual sections in the display, but there is no effect, when selecting the button.
There is no error message.
Turning the whole system off by dis- and reonnecting the batteries has no effect on the failure.
Could anyone help here?