When having one Multi RS Solar, and having the need of more charging power to the Battery:
Can I expand with 1 additional Multiplus-II to a 2-Phase split system?
And will it still work with ESS? And it should still be controlled by 1x Cerbo-GX.
Question is, because having to buy 3x Multi RS Solar would be technical and financial overkill…
I know Victron says “…of same size and type…” in the docs.
But I wonder what Quick configure would say when trying it, and if someone has such a system running.
Additional info: AC-Outs will not be used here.
You cant mix up models in split or 3 phase and cant use one cerbo GX on 2 different systems like that
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Yes, I understand the rules from Victron.
They make technical sense when it comes to using the AC-Outs.
But from a view of pure electrotechnical possibility, a system like that could indeed work on AC-In and also in loading the Battery together as one ESS, just like Victron does with MP2 + additional MPPTs as one ESS.
But you say that it is not supported, OK.
So, actually the Quick Configure would not even accept the MP2 on L2, after I attached a Multi-RS on L1 first, when I configure the 2-Phase System?
I have no advice on that but a mere suggestion from a non-technical person: Have you considered a non-parallel multi in charge only mode? That would require an MK3 and has data display limitations.
Also, you seem to be using the term ESS not the way Victron uses it which can create confusion.
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Thanks for the hint. One of my main targets is to have it completely displayed (all energy flows properly assigned) in new GUI and in VRM.
And Sorry, I’m not aware that there is another meaning of ESS. Where exactly differ my wording from Victrons meanings?
But however, you got what i meant to say. 
Regarding the (independend) charge-only MP2: could there be a way of getting the data in by some of the new virtual devices via NodeRed?
If there is a way for that, it could be a solution…!
Elsewhere, ESS can simply mean a generic Energy Storage System whereas Victron uses the term to refer to a specific software mode. So you can have ESS in the first sense but no ESS in the second sense.
Regarding using other means to get the data, I don’t know. I will defer to experts. But some data is available in VRM natively. I don’t know which data. This is not displayed on the VRM overview but you can see it through a VRM Advanced Widget. All this is documented somewhere.
Again, I refine my question.
Initially I was wrong, as there is not even a way to do a 2-phase or parallel system with Quick-Configure, as the Mutli RS is connected to the Cerbo GX by VE-CAN, and the MP2 would be by VE-Bus.
So, say, I want to use the additional MP2 really just as charging device.
So not completely in one logical ESS now, but: both in DVCC from the Cerbo!
As we have the (quite new) situation here that the devices would be split over VE-Bus and VE-Can, the Cerbo Docs do not cover this configuration really.
Did anyone try this? How does the Cerbo GX react when connecting one Multi-RS with ESS configured, on VE-Can (as the “Main-system”), and then connect a MP2 on VE-Bus, used only for charging?
Would it offer DVCC for both together?
What would be shown in VRM Overview or in the GUI Overview?
Any experience report on this would be greatly appreciated! 