mrzed001
Voice of reason
I think that the attached are the EU types of earth system.
Not only in TT but in all the other cases there is local ground too.
Really what you need I think is TN-C-S.
You get 2 wire: Line + PEN (N + PE because it is grounded on the transformer side too)
In the pic where PEN is separated to PE + N, there is the place for the local ground to connect.
There is no problem with that. Leave it so.I checked what would happen if I connected the local E to the incoming N and there would be a 4 A circulating current. Obviously one or both of the E connections are not that good most likely the one at the transformer since it is connected to the earth wire of the HT system. It needs this for the fuse protection on the HV line to the transformer to operate.
And now make the Volt measurements again ... and they should be OK.
I think the inverter uses the ground for reference.
Any answer from Deye ?