Hello I have a switchboard to install for a caravan park with Seasonal loads, There is a 3 phase off grid solar system with 3 x Quatro 15’s and 60 kVa on the AC input. There are currently 2 submains leaving the solar Distribution board (DB1 & DB2 in pic) DB2 has heavy seasonl loads and we would like to use a changeover switch to supply from the 120kvA generator and supply DB1 from the Inverters, My question is regarding the correct Neutral connection and MEN connection, My thoughts are all neutrals would be connected to a common neutral link with the MEN and not run through the change over switch. Photo below, Solar would be connected at the 60kvA input and 60kva is connected to Victrons (solar)
I think that it would be best for The neutrals to remain common, with the single MEN link, or this will have to be switched as well - most MEN setups do not permit or recommend any switching in the neutral conductors.
However, i would point out that the 120kVA gen will not be synchronised to the Solar inverter system, so ALL switch gear needs to be rated for 630v rms, and adequate insulation and isolation clearances maintained.
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