My setup consists of a single Multiplus handling a single phase in a dual phase (50A) RV. This means that the Multiplus feeds phase 2 of my system and that phase 1 is running in parallel but untouched. When I don't have shore power, the Multiplus inverter feeds the devices that I use the most (i.e. all on phase 2) and phase 1 is not serviced. In this case, the Multiplus will bond PE (ground) and Neutral since it detects that there's no shore power. When shore power returns, the Multiplus disengages the ground relay and no longer bonds PE/N locally which means that the service entrance PE/N bond takes precedent. This is the expected/correct behavior.
Another scenario may be problematic... Imagine that there is shore power and that the Multiplus ESS is configured for self-consumption:
1- PE/N are bonded at the service entrance.
2- If the MP decides that there's enough solar power to supply the loads, it will disconnect from shore (in this case, phase 2 only while phase 1 is still connected to shore).
3- I assume that in doing so, it will activate its ground relay and bond PE/N locally which means that we now have two PE/N bonds: 1) at the service entrance, 2) at the MP. This is NOT the correct behavior.
How can this specific scenario be corrected, please?
Thank you
lg
