LiFeYPO4 cell voltage logging on VRM workaround?

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johanndo asked Jun 16, '22

LiFeYPO4 cell voltage logging on VRM workaround?

VRM portal cell voltage logging

As there is no available option to log cell voltages on the VRM (yet), would a workaround using a couple of DC METER object instances containing the to be logged cell voltages do the trick? One could use the custom widget in VRM to join the graphs of the 4 "sensors" over each other for the 4 cells.

Is there a better option to get cell logging working on vrm?

VRM dc meter

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Modifications Space

Node Red Space

Answer 1 · 2022-06-16T06:06:03Z

nickdb answered · Jun 16, 2022 at 06:06 AM

BMS’s don’t send individual cell data - CAN has limitations as to how much information can be broadcast.

You can display min/max cell voltages (Temp and Cell ID accessible via the GX) on VRM, provided your BMS sends it.

Anything more detailed will need to be extracted with battery management software.

It’s not a VRM issue.

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Answer 2 · 2022-06-16T06:48:25Z

johanndo answered · Jun 16, 2022 at 06:48 AM

The data acquisition in the Venus OS is not the problem, I wrote a service that reads the data from my REC ABMS via RS485 and creates a DBUS hive / device with all information and settings from the BMS, I have it integrated into the UI as well. But I haven't found yet a suitable container for the values to send them to the VRM for analysis and visualization.

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andyalford commented · Jun 19, 2022 at 06:20 AM

I'd like to test that out on my system here. I have the REC ABMS too. Let me know if you would like some feedback. Well done!! Andy (mail at andyalford dot com)

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link-cat commented · Dec 16, 2022 at 06:51 PM

Amazing integration, these values were shown on VenusOs, maybe is a Modbus register that can be used for that? Just thoughts. If it can be done, maybe a new set of graphics could be displayed through node-red/influxdb/grafana.

I'm planning on my system, with 8 Seplos BMS paralleled on CAN, and just came here searching a way to display the individual cell for each cell of each pack. The most i reached was finding the modbus topic for min voltage cell id:

/System/MinVoltageCellId

I was hoping to found something like:

/System/battery1/VoltageCell1 /System/battery1/VoltageCell2/System/battery1/ResistanceCell1and so on... But it isn't.

The thing is, if the VenusOs has the possibility to identify cells, it doesn't seem too difficult to think that can be done.

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