The new Multiplus II has anti-islanding and a lower standby-consumption than the classic one at the same price (I hope it will be the same quality anyway ;)). But it is only available as a 3000VA Version. In an ESS-system this normally would be enough to providie enough power for the most devices, e.g. a washing machine. Unfortunately if you strive to get 100% self consumption in summer you can only use one device at the same time. So in an average household you need at least two Multiplus II if you don't want to turn the lights or TV off when the washing machine is running.
There are countries with a monophase utility grid like some areas in Italy, which would make this easy. But there are also countrys with a 3-phase grid utility like Germany.
Now in Germany and other countries the maximum unbalanced load of the phases is allowed to be 4,6kVA. Btw: Is that why there isn't a 5000 Multi II, yet?
I have one question about this "problem".
(How) can I provide 4,6kVA to all three phases with the ESS without buying a 3-phase Multiplus 5000 system with external anti-islanding? I think (but don't know) that 2 parallel MP3000 aren't allowed in only one phase, although that would be the best and cheapest solution with an energy meter and phase compensation. When using a 3-phase 3000-System and there is a load of 4000W on L1 - what happens? Two parallel Multi II could cover this to 100%, no matter on what phase it is needed (when having the correct power meter). But is it allowed?
If it matters: there would be a 20kVA-Fronius-Symo-3phase-Inverter at the AC-In of the Multis (because of the 1:1 rule) and a small 1,2kWp DC-Victron-MPPT.
Thank you very much!