I've looked for other answers, but not found something that answers the specifics of below
For background and context to the questions.
I have an old ship that takes 3 phase shore power and internal wiring / consumption across all 3 phases. The current shore power is 16amp at 400v (Sweden) giving peak usage of 11Kw across all three phases.
The system is all 240v on the consumption side baring an achor winch and old electric heating (not used) at 400v. There is a 6kw sh*ty 3 phase 6kw generator (will be replaced).
The DC side is 24v, with a 100 amp engine alternator for starter and house battery charging, plus an old Victron Skylla 24v mains charger. At the moment the house batteries are 200AH (5ish Kwh).
I cannot afford 3 multiplus' in one purchase, but I need to install at least one invertor to fix the issue that I have no power when the shore power is removed (existing inverter not working and modified sinewave, installed by last owner).
Off shore power I will need max 9kw (3kw per phase) across all phases for brief periods with average of about 2kw peak for induction hob and oven
So, the questions are...
Can I install a single multiplus to power all phases as a short term solution until I can purchase 3?
Can I install a multiplus to power just a single phase when not on shore power?
If I have 3000/24 on a single phase, can I use self consumption from the batteries even if I am plugged into shore power for the phase in question? I guess this is phase compensation, but with only one phase?
The 24v 3000VA multi is technically 2400w, if I set it to disconnect none-essential loads when not on shore power, I can keep the usage below 2400 peaks, but I'm kind of on the border of needing the 5000VA version. IS the 5000VA overkill rather than managing usage instead?
If I put in more batteries to spread the current draw over say 10 x 100AH 12v which would give 24v 500AH supply, with peak draw of 500amps at 1C and I would be peaking at approximately 400amps to deliver 9Kw, is this considered too much draw for 24v? The batteries will only be 1.5m cable run from the multis and the draw would be 130amps ish per multi. The average draw will be in the 30 - 50 amp range when in use
The ship systems are all 24v, but would it be best to consider 48v storage and then use 48v to 24v converters to power the ship systems and install a 24v to 48v battery charger to draw power from the engine alternator?
Sorry, for a long post, but I am trying to decide the best solution, so I can begin to install :)
Look forward to your replies