Thank you @coulomb. I did a reflash and everything seems to work so far. It should be cloudy tomorrow morning, so I'll see how the inverter reacts. I really admire your work.
Greetings. I have an Axpert MAX II 8KW and it has the same voltage problem at 90V. But to my surprise firmware 81.03. Has anyone encountered this firmware or a compatible patched firmware? Thank you