The case with the seller has one more thread, apart from the technical one. I will wait for a response from Corab.
Generally the inverter works. From time to time, errors pop up and it turns off for several or several hours. Then, it activates itself again, e.g. after a night or an hour (I don't know exactly).
It does not look like there are too many panels, because in summer itself it worked normally on sunny days, and it can turn off on a cloudy day, although I think it may be affected by the sudden departure of strong sun from outside the clouds.
