I don’t need 3 phase, since I don’t have 3 phase devices.
Connecting the inverters in parallel solved the problem.
For many month I don’t need to worry if this or that is connected to connect something else. The most worry I had was the car, but it lowers the power to charge, if the house needs power elsewhere.
Good to hear you got it solved for your use case. I do think there is a broader topic that is interesting to discuss based on your original question, one that I will revisit when our own single phase 40A 230Vac mains gets upgraded to three phase 3 * 25A mains.
your reply re-triggered a former question I had in another thread on having asymetric loads in Delta-configuration with Victron MP, which sounds pretty much to be an open Delta.