I think this question is what i am asking, the answer seems to be yes, its fine, but then some issues arose, so i thought i'd double check.
I want to use a single ET340 to both monitor total grid usage, for both direct loads and via the multiplus, and also monitor solar production on 'output' connected ac coupled PV.
Is this connection acceptable?
(Electrically, i don't see it as any different to 3 phase going off to multiple multi-pluses. )
Unfortunately, while the microinverters report their production via a console, the noise from the multiplus seems to disrupt the power line communication, so they typically report very infrequently. I'm hoping the ET340 will show (more) accurate production. I realise ESS will sort it out anyway, but i'd like to know what is going on.