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Nicholas Herbst avatar image
Nicholas Herbst asked

Mapping BMS RS485 to Venus OS

Hi All,

I'd like to consider the development of mapping a new BMS, with regards to its RS485 registers, to the Venus OS on particularly a Colour Control GX.

I would envisage connecting the BMS via a Victron RS485 to USB Interface Cable and then using the Modbus-TCP protocol on the CCGX.

It seems to have been done already with the ZBM Redflow Battery BMS. See here: https://www.victronenergy.com/live/battery_compatibility:redflow_zbm

Can anybody point me in the right direction or offer any advice?


Thanks in advance,

Nicholas

BMSrs485
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2 Answers
mvader (Victron Energy) avatar image
mvader (Victron Energy) answered ·

Hi, sorry, but that won't work. You can't write BMS data to our system using ModbusTCP. The only supported protocol is CAN-bus.


The alternative would be that your driver takes the data from RS485, and then publishes it to the internal D-Bus. Doable, but tricky, there is not a lot of public documentation available - and in case there is ever some issue with such system all our support people have strict instructions to stay far away from it - as I hope you understand.


If you are going to do this, then I recommend to start with getting your hands on a system with a canbus bms, so you can see the D-Bus profile and mimick that in your own driver.

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Nicholas Herbst avatar image Nicholas Herbst commented ·

Thank you for the response.

Would it not be possible to "piggyback"/copy the solution that is in place for the ZBM Redflow RS485 BMS Communication?

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gro avatar image
gro answered ·

Have a look here, might not be exactly what you want but I think it will achieve the final result you are after.


https://community.victronenergy.com/questions/76159/victron-venusos-driver-for-serial-connected-bms-av.html


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Related Resources

Victron VE.Bus BMS product page

Victron 3rd party BMS compatibility page

Additional resources still need to be added for this topic