sensor.bms_kwh_remaining Update frequency?

[KmE77]

As the title suggests I was wondering how often the *sensor.bms_kwh_remaining* parameter is updated in the Bms?

I recently doubled my capacity from 5.2kWh to 10.4kWh, previously my original packs provided 5kWh from the 5.2 available so I was expecting the new batteries would perform at the same reduced capacity, so 10kWh but I'm only seeing 9.71kWh reported by the BMS.

I installed them when all packs were at 50% charge, updated the firmwares for my mixed setup (2x V1, 2x V2 batteries and V2 BMS) and have full cycled several times from 10-100%.

Is there anything I'm missing, will the packs eventually balance to the expected 10kWh or do I have to accept that the mixed battery setup is inherently a flawed setup and can't offer the full expected capacity?

Any input would be much appreciated.

Thanks Gents!

[Will]

The sensor updates every 10-15 seconds normally but home assistant only shows the updated when the value changes.
Mixed version systems can do odd things but ultimately, 300 watt hours is not enough to really worry about. Remember your existing stack might have wear so the total kWh will be less.
Also remember that the pack will take days to weeks to balance correctly and the data reported from the inverter is only a guess provided by the bms.

[KmE77]

Hi Will,

Thanks for the reply, appreciate it!
Yeah I knew about the existing degradation (5kwh out of 5.2) so just assumed because they were the old batteries, I'd lost 200wH and the new ones would only perform as well as the lowest in the stack giving me 10kWh for the four packs.

As you say it's not a massive difference in expected capacity but I just wanted to be sure because on the face of it, it LOOKS like the new batteries are bringing the entire stack down by 700 Wh (from the -200 with just the old batteries) because maybe they have 350 Wh less than they should (bringing the stack to 9.7) and as they're brand new that was disconcerting.

Hopefully they'll settle down and the capacity will creep up over several cycles.

Cheers.