3-phase MultiRS system disconnects from AC input when missing phase

I just got one phase disconnected, the whole system went off the grid even if there are 2 phases available. I have

  1. 3x Multi RS
  2. Cerbo
  3. Grid Meter VM-3P75CT set as 3 phase grid meter

The expected behavior for me with the “continue with missing” feature enabled is that 2 other inverters still can get energy from the grid and stay connected. What’s wrong on my side?

PS> I think this might be the grid meter that tells system to disconnect

Can you set the minimum number of inverters to start to 0 not 1?

Did not help

The continue with missing phase is a feature used if one unit is off or missing.
I think switched a group is still a thing. Or at least that is how I understand the document.

Manual Excerpt

As far as I know it should continue get the power from grid for connected inverters. Even if you are right, when I turn off one inverter (the one without line) the rest did not start to get energy from grid

Do you have a reference for that piece of information?
Do you have can islanding enabled or disabled?

I’ve tested this before. Previously I had to connect one phase generator to 3 phase system. Here and in facebook people suggested me just to connect it to one phase Victron Energy | I have 3 phase system with 3xMultiRS Solar | Facebook

And it worked. Basically “connected” invertor went to “External control” rest were in “Inverting” mode. I switched off 2 phase out of 3 and it was ok. Something changed lately in Cerbo or in other place that it stopped working

Hi @evgeniy.labunskiy

The ability to adjust the “switch as group” functionality for the Multi RS has not yet been implemented.

“Continue with missing phase” only applies to the off grid inverter operation.

On the grid the system operates as ‘switch phases as group’, this is not yet configurable and additional development is needed to make this work properly.

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@guystewart thank you for the answer!
I’m wondering why It worked before than

What RS firmware version are you on?

1.16, so latest

Try without grid meter if it works

Tried, removed it completely from the system - no effect

don’t forget to reboot cerbo after removal
if no effect - then I’d wait for what Guy Steward said needs to be done

If it was working before - if you can find a configuration venus os version at that time - maybe downgrade could help. But overall - the main reason I’m not RS multiphase is they are great, but WiP.

Will try to downgrade at the evening, removing meter + reboot did not help

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I don’t have a good explanation, but I haven’t tested 3 phase RS much myself beyond the basic setup.

I’ve just been going on what the R&D engineers have told me beyond that.

However it happened, it’s not expected to work right now and is a known limitation.

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Thank you! Hope this feature will be implemented soon and I don’t need to buy DC charger or 3 phase generator for this winter :slight_smile: as well as widely awaiting for grid export :slight_smile:

There is much to look forward to on the road map

If you don’t need 3 phase loads specifically then one could be set temporarily to stand alone mode to allow for a single phase charge

I expect the ability to disable charge as group feature will be added via a firmware update, but i can’t say when, there is also a lot of demand for parallel support, grid codes and more.

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So you are saying that I can just set every inverter into “standalone” mode? the whole system will still work, right? Meaning PV charging, I can still see all devices in VRM etc

Yes, that is correct.

There is another setting you’ll need to change in the VictronConnect as well, each unit on the same VE.Can bus network, but with unconnected (or unsynchronised) AC outputs should be on different “System instance” number.

This is in the ‘system’ menu where you set the System Configuration between stand alone and 3 phase.

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