Communication problems with MultiPlus

DIY
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1

Hello everyone,

I’m trying to resolve a communication problem between my MultiPlus-II 48/3000/35-32 and Venus OS (running on a Raspberry Pi) via an MK3-USB interface.

Here’s the context and what I’ve done so far:

  • Hardware: MultiPlus-II 3000, Raspberry Pi (latest Venus OS), MK3-USB. (Note: battery data comes through the CAN bus without any problems; the issue is purely on the VE.Bus side.)

  • Original problem: I discovered that the battery had stopped charging and discharging, and saw that the MultiPlus was no longer available in VRM either (last seen 14 hours ago).

Fixes tried:

  • Replaced the network cable and tried tested network cables.

  • Replaced the Raspberry Pi’s power supply (the Pi was showing an undervoltage warning).

  • Connected via VictronConnect. It didn’t detect the MultiPlus, but a forced firmware update to v568 reset everything to factory settings.

  • However, I still can’t establish a connection. I can’t connect with VE.Config either: it does connect, but shows lots of pop-ups about “incorrect” settings and ends with a communication error (communication error).

  • I used VE.Flash to downgrade the firmware by one version, but got the same result.

Current situation:

So I can update and downgrade the firmware, but afterwards I can’t connect to change the settings.

Does anyone have any other ideas about what I can try?

2

Hello, I have a similar problem with an additional Multi connected to the Cerbo GX via an MK3-USB. After restarts, the “BMS Lost” alarm appears on the additional Multi.

Using “Restart VEBus Systems” under the device clears the problem until the next restart.

Can you access VE Bus System via Console under Device list/Multi/Advanced?

3

It no longer appears in my device list. I then check the Venus OS dashboard (on the Raspberry Pi), which, if I understand correctly, is your Cerbo GX. The other devices are listed, and I don’t get any further notifications either. But my BMS communicates with the Pi via Cam.bus, not directly with the Multiplus.
I did find this topic, though: MK3-Multiplus 2 48 5000 70 disappears from ESS – communication problem - DIY - Victron Community.

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