Extra inverter as DC system in a 3phase system

DIY
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1

Hi, been breaking my head over this for a while now.

I have a Multiplus-II 3 phase configuration, works fine. Now I would like to add another multiplus-II as a separate DC usage system to create an additional mini-grid for extra usage of high powered pyrolysis oven (around 3.5KW) continuously.

Now to prevent overloading up my 3phase configuration which I use for my household appliances, I was thinking of adding my spare inverter as a DC usage system. Not a problem of course, just disable the charger in the unit and let it only invert DC to AC.

Now comes my thing that I cannot figure out: Can I connect this new separate inverter to my existing Cerbo-GX and have the system see it as a separate inverted or will the system get so confused that it will break?

Secondly, is adding this single inverter as a DC usage system a good idea to have additional power in stead of adding 3 extra inverters in the 3 phase system?

Any help or pointers to think about would be appreciated much.

2

Hi Ivan, I used an extra Cerbo GX with an extra Multiplus II/48/5000 in addition to my 3phase configuration of 6 Multiplus II/48/3000 to have my heating pump running from my pylontecs.
you have to loop thru the BMS cable from one Cerbo GX to the next Cerbo GX. all works fine.
I did realize in February 2025.

3

thnx for the tip. Will surely consider this option.

4

Hello ivan.cavanaugh, were you able to try it out? If so, could you kindly share your experience?