Hello, I would like to discuss an idea for server-room setup:
- Currently the server room is feed by 3 phase (with one N)
- If the main fails, a generator kicks in and with a transfer switch it’s hand over from main to generator
- I would like to replace the generator and transfer switch with 3x independant Multiplus-Setup for each phase (battery, cerbo GX, multiplus II 5000/8000)
- why idenpendant and not as configured 3-phase-system: Out of my opinion it is more fail-safe. If on thing fails, it has only effects on one phase
- Main-power from AC-in (L1-N, L2-N, L3-N - common N)
- Out to the consumers: AC-out 1 (L1-N, L2-N, L3-N - common N)
Main question: Does this work? Problems I see:
- The phases are not 120° shifted.
- worst case (=0°) the current on N = *3 ← based on the current capcity of installation this is not an issue
- no 3-phase consumers are connected; all are 1 phase. Most components (server/switch) use 2x 1phase
- From my understanding the MP checks, if the PEN is closed on the output (AC-out 1). If yes, it does not start the “island operation”
- What happens, if one of the MP is faster than the others: It will start the “island operation” and closes internal the PEN.
- The next MP sees a closed PEN and does not start the “island operation”.
- Am I wrong or is there a way to close the PEN-relay but do not check it?
Is there another showstopper?
Thank you and best,
Johannes