For my home in the Netherlands, I'd like to achieve a net zero output to the grid using only 1 MultiPlus inverter while having 3 phase grid connection.
This would mean that when I have my multiplus on P1 and a load on one of the other phases (L2,L3) I would have to "actively" export on L1, drawing power from the battery/PV.
The smart meter (grid) will offset energy exports and imports across the 3 different phases. This should allow me to offset any consumers on 1 phase with an export on another, effectively keeping the meter at zero.
Background
In the Netherlands today you can (still) export your access power to the grid and subtract the export form your import on your annual bill (at equal rates). This system is fantastic however, it is scheduled to change and in the future you will no longer get the same rates for the power you deliver to the grid as when you buy.
For my system I'm looking to find a solution the does not require me to buy an inverter for each phase and allows me to minimise net my power import, across all phases.
Below I've drafted a schematic for the system I'm planning to build. For my question here I assume the battery is already installed.
Does anyone have experience with such a system, any advice?