Multiplus continues to charge even if disconnected from Cerbo GX

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Eran Rundstein asked Dec 22, '21

Multiplus continues to charge even if disconnected from Cerbo GX

Hello everyone!

I have a REC BMS Q connected to my Cerbo GX, which is also connected to a Multiplus 3000. I have enabled DVCC/SVS/STS like the REC BMS manual suggests and I am running an unexpected problem: when I disconnect the BMS from the Cerbo, or when I disconnect the Multiplus from the Cerbo, the Multiplus continues charging.

I would've expected that if there is loss of communication the Multiplus will abort charging. Going over an Orion BMS manual, which is also Victron-CAN compatible, they do indicate that loss of communication should prevent the Multiplus from turning on.

The Cerbo GX manual also indicates that should be the case - in the section where they describe what happens if you power up the CerboGX from the Multiplus AC ouput. But in my setup for whatever reason if I power up the Multiplus with the Cerbo turned off, it is still happy to charge - which is unacceptable for safety reasons...

Does anyone have any idea what I am missing?

I'm attaching some photos of the information displayed on the Cerbo.

Thank you!

MultiPlus Quattro Inverter Charger cerbo gx multiplus ve.bus

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Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Modifications Space

Node Red Space

Answer 1 · 2021-12-23T05:51:34Z

mvader (Victron Energy) answered · Dec 23, 2021 at 05:51 AM

Its like that indeed. Not perfect, but is what it is. For best safety, make the BMS control a relay.

I can’t remember where, but a long time ago I wrote the same, but then more verbose, and end conclusion: for a safe system with 3rd party battery, have the safety features (relay) built into the battery/bms and controlled by the battery/bms.

Just like all the professionals do: BYD, Pylon, Battleborn, Freedomwon, and so forth.

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Eran Rundstein commented · Dec 23, 2021 at 06:42 PM

Thank you. The BMS does have a relay, but I was hoping for a more elegant solution given all these fancy buses. Oh well :/

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