I want to build an ESS consisting of 2 Multiplus 2 (48V 5000) with two 280Ah batteries - so my main goal is to keep the meter at zero, not so much to gain independance from the grid or to create an UPS for my loads at home.
Currently I am struggeling on "how to design" this ESS correctly. My understanding is that there are 2 options (due to "Schieflast" in Germany paralleling is out of question).
- Connect the 2 MP2 as a 3phase system (obviously only creating a 2/3 part of a 3 phase system on L1 and L2). The systems will share both batteries via an appropriate busbar, one Cerbo GX required.
- Have two completely separated MP2 installations - one on L1, one on L2 for example. This would requried a Cerbo GX for each. But how will those system align on the grid setpoint?
Option 2 seems easier to wire, with the problem to get the meter info to both Cerbo GX, but I guess using the mqtt-dbus approach that should be manageable. Option 1 would be quite ok for me, if this is supported by Victron.
Happy to hear some suggestions on this one.