dmq avatar image
dmq asked

Second independent Multiplus possible


I have installed a single V MP II 48 3000 on phase 1 (AC IN) of a 3 phase AC system. The system is connected to two Solar Charger and a Pylontech Stack.

Is it possible to connect another V MP completly indenpendent from the 1st installation (own GX, own Battery) or will they identify / interfere each other?

Thanks in advance,


Multiplus-IImultiple inverters
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2 Answers
Alexandra avatar image
Alexandra answered ·


If you are running it as a stand alone system with all its own associated devices it will be fine.

It really also depends also on how you are wiring it into your DB board as well.

If it is on another phase completely feeding other loads that is fine.

Needing to program for three phase or split or parellel systems implies (that there is a need) that all units are feeding what is classed as one load electrically and so need to be synchronised.

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dmq avatar image
dmq answered ·

Thank you @Alexandra - in my case I would like to feed in to the same L1 phase and the loads are also the same as in the first installation. Is that an issue / problem (beside of the "Schieflast")?

Another option I am thinking of would be to connect the 2nd installation to AC Out 1 of the 1st installtion - would there be an issue regarding regulating the power-generation of the 2nd MP by i.e. shifting the frequency? The 2nd installation should be much smaller MP 12/500.

Thanks again.

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shaneyake avatar image shaneyake commented ·

Having the second setup on the output of the first is called cascade. This is not supported by victron at all. It is possible to do but a lot harder than it is probably worth.
I have done something similar but wouldn't recommend it. There is so many edge cases where something will go wrong. The second unit does not understand the frequency shifting. You have to implement your own control system to get it working reliably.

So for having them on the same phase but not cascaded that is totally fine and will work. If you need to do zero feed-in that becomes harder.

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shaneyake avatar image shaneyake shaneyake commented ·
To clarify you can not connect the outputs of the Mult's together when they are running as independent/stand alone. You would have to split your loads so that each inverter is only powering some of the loads.
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dmq avatar image dmq shaneyake commented ·
Thank you @shaneyake - I can not access "your" (?) blog post (I am confronated with a google login) - but your hints help me.
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shaneyake avatar image shaneyake dmq commented ·
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Matthias Lange - DE avatar image Matthias Lange - DE ♦ commented ·

If they are on the same phase on the output and supplying the same loads you have to program them as a parallel system.

In that setup you can only have one GX device and the Multis should/have to be on the same battery.

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dmq avatar image dmq Matthias Lange - DE ♦ commented ·
Thanks Matthias!
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Related Resources

MultiPlus-II Product page 

MultiPlus-II Manual

MultiPlus-II 230V Datasheet 

VE.Bus Error codes

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