CAN PGF for "available capacity"

Modifications
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1

Just wondering if anyone knows the CAN PGN for the available (rather than the installed) capacity of the battery?

2

It’s PGN 127506.

But “available” it’s, more or less, “remaining capacity” on that PGN…
Be careful because there are additional info on that PGN, not only remaining capacity.

3

It turns out to be byte 2&3 in 0x35f (863). This also has the firmware version in byte1.
I suspect that there are other undocumented headers that do some very interesting things…
I also found:
CAN-bus BMS Protocol
CONFIDENTIAL
This document is intended for manufacturers of Managed Batteries: batteries with a CAN-bus
this document on line. Helps a lot.
BTW available capacity is the nominal capacity of the battery modules on line, rather than the remaining capacity in terms of %SOC.

4

Hi @MikeD

Sorry, I believed that you’ve asked for a PGN (Parameter Group Number) which is a characteristic to NMEA2000…

It seems that you’ve looked for the CAN ID for that info… :smiley:

Do you have a link for that document? Thanks in advance!

5

https://www.genetrysolar.com/wp-content/uploads/wpforo/default_attachments/IPB/s3_g308908/monthly_2023_02/1016944466_can-bus_bms_protocol20210417_pdf.b32c1954d6145579b857d66191327e30

I’m certain that this document should not be floating around!!

1 Like
6

Thank you @MikeD !

7

maybe you need to try ecosia as a search engine, rather than google!!