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ESS Setup:
Multiplus II 24/3000/70, Cerbo GX, MPPT 100/50, SmartShunt, LifePO4 210Ah 24V batteries
The issue is that Multiplus gets an error
Error 8: Ground relay test failed on VE.Bus System (Multiplus)
This is only when Neutral of OUT2 is connected to common Neutral busbar
If all sources of OUT2 are on separate neutral bus this error does not occur
According manual I haven't found any requirement to separate neutral on OUT2
If you use a common neutral then you will be bypassing the relays and then their tests will fail. The relay will appear closed when the test is expecting it to be open. This is one of the reasons for having a separate neutral.
Also a common neutral means that you are only disconnecting one live conductor from the network since the neutral conductor is permanently closed via the common busbar. You should be disconnecting both live conductors (line and neutral) when AC-IN is not present.
