MultiPlus-II 48/5000/70-50 GX unit compatible with non GX version of same unit in parallel?

DIY
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Hi to all

I currently have x2 MultiPlus-II 48/5000/70-50 units in parallel working like a charm for several years now. Occasionally in the Summer I get close to max output as the units derate due to high temps so I could do with more power.

Question is, would the GX version of the same units be compatible with the existing two non GX versions to run as third unit in parallel?

TIA

2

Yes they are, but the manufacturing date should be not too far apart

Ask your victron dealer if they have a “matching” unit in stock

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You can only have one GX device in your system. So if you already have a Cerbo this won’t work. You’ll need a vanilla 48/5000/70-50

4

Yes thats correct!

5

Yes I do have a Venus GX in the system, so you are saying the GX device in the Inverter would negatively interfere with the Venus? Is it possible to just disable the GX in the inverter and carry on using the Venus as I do now.

The reason I ask this specific model question is a friend has upgraded their MP2 5,000 GX to a 10,000 GX and would sell me the 2 yr old 5,000 GX for a good price.

The GX inverter serial is HQ2235 - Sept 2022

The two existing non GX are HQ1928 - May 2019
HQ2043 - Oct 2020

6

You can pull the plugs on the internal gx to use it as a normal multiplus

They are pretty far apart, so could give you problems… but i have seen these age differences working fine before

If hw revisions are to different it might not work at all

7

Yes that is interesting to note, glad I asked.

What about if I used the GX inverter separately to feed 230V thru the two non GX (so they are in passthru mode) and set assistance on the non GX’s in parallel to 16A so when the load goes above this they start assisting. Would that not get me almost 12KW?

8

Its not supported or recommended, but has been done before but only the other way around, higher power feeding lower powered multiplus

Systems will have to be apart from each other (own battery bank, no communication between them)

9

Okay that is also good to note.

Perhaps I would be wiser to spend €500 on air con unit for the RE Kabin and then the two 5000’s I have in parallel would be full output all the time. When they get to 45C in Jul/ Aug the OTemp lights flash at 6KW load, they have never shut down but it must be stressing the internal components.