BMS CAN isolated on Multi GX?

dear community,

we know the problem when connecting VE.direct without isolation e.g. on a Venus Raspi system (when e.g. JK interrupts B-/P-, power from SmartSolar may (try to) flow over VE.direct ground)

Now I’m asking myself if it is safe to connect BMS CAN of a JK BMS PB series to MultiPlus II GX without isolation?! (CAN_hi/lo + Gnd)

In the manual of the Multi GX nothing is mentioned regaring isolation of the BMS CAN interface. In the Cerbo manual “1 x VE.Can (not isolated) and 1 x BMS-Can” is written, what makes me assuming that the BMS CAN is isolated.

Is it isolated in the Multi GX also?

thank you very much & greetings!
Phil

Hi @Philippoo

See the table here for the most current specification - Victron GX product range [Victron Energy]

Hi Guy @guystewart

thank you very much for your response!

I checked the linked page but can’t find any info regarding isolation of the BMS-Can port. The only thing mentioned that “Late 2021 / early 2022, … MultiPlus-II GX … update … changes the CAN-communications port from a limited 500kbps BMS-Can only type to a full featured VE.Can port (non-isolated).

But today there are two BMS-Can sockets and no VE.Can (according to the manual).


grafik

Or is the pic in the manual outdated?

Could you please kindly clarify?!

thank you very much & greeting!
Phil

ah, ok, I missed something (half hidden and does not appear in text search…)

but now I’m even more confused…

To confirm, it is non-isolated, regardless of VE.Can or BMS-Can port label for MultiPlus-II GX and EasySolar-II GX

Looks like a bug in that table now. I’ll get that fixed,

1 Like

thank you!!

hm, I clicked ‘solution’ and now it says “thread will get closed in 14 days” - I think it might be useful to keep it?