Hi, After replacing a failed MPPT 450/100 my off grid system stopped synchronising. While I have successfully restored normal system operation, I’d like to ask whether experts or Victron engineers can confirm or correct what I found. I seem to have solved it when I discovered that my original work…

They are all sharing one instance bus. That is fine. If you change that then you are separating them.

Can instance grouos a set of can devices, each device can have a can id on that can bus. Its not entirely unique to a victron system just how can works. Even can bus in vehicles is set up like this. A short google search would have answered that. @VWard Just a warning about AI use. Even to struc…

I used Claude to help me focus this post. I edited it myself extensively. Please accept this post it really is no longer than it needs to be. My own version was far more rambling than this. Perhaps you are concerned because I call myself a beginner and that is possibly an exaggeration. But I’m not D…

Were all of the guildines followe when the mppt was put in place? Even though it is a loaner ALL firmware in the system would be updated when changes are made. Checked that programming was in place? [image] VWard: For information, the startup times of the two MPPTs was only one minute apart e…

The battery configuration we set up originally has worked well for us since 2019. And we did update all firmware when we brought the loaner in. And I only mentioned the startup times because it seems relevant to the fact that the MPPTs were doing absorb charges more than ½ hour apart.

You say that a short google search would have answered this. It did not. Please can you tell me where it is documented on the victron site. The only thing I could find about groups was documented as VE Smart Networking, and I’m not using VE Smart Networking, only VE Can Bus

For DVCC and no intelligent battery not using ess since you are offgrid, the mppts will each use their internal charger settings using the shunt as a voltage base. It is documented as such. 11.3. DVCC effects on the charge algorithm - 11. DVCC - Distributed Voltage and... These feature…

Thank you for your reply, just to make this clear, once I set the Color GX and both MPPTs to Device ID 0, it all started working. And Thank you for that link. I’m afraid that all I can find regarding device instances seems to be this, and it isn’t clear to me that all devices should be Device ID 0: …

The can won’t be the issue. [image] VWard: how do I address them They will have their own ids.

Thank you so much for this confirmation, but I still cannot see where this is documented from Victron. I’d be grateful if you could confirm where? And does this mean that Device ID is the instance bus of the VE Can Bus?

VE.Can Bus parallel MPPTs: must devices share Device ID for DVCC synchronisation? Documentation?

DIY

VWard 17 May 2026 17:43 10

So setting Device ID to 0 on all of them is the fix? This is what seemed to solve everything for me. You’re confirming this?

MPPT synchronization problem

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VE.Can Bus parallel MPPTs: must devices share Device ID for DVCC synchronisation? Documentation?

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