question

play3000 avatar image
play3000 asked

BMV712 at 100% after reconnexion

Hi,
I think I have a strange behavior in my installation.
When I reconnect the batteries to the system after a stop when I have no usage, the BMV (and the Cerbo connected to it) go back to annouce 100% of battery charge, even if when I shut down it was below that (for example 90%).
When the system is shut down, the BMV is still connected to the batteries and it is working (it is connected to the battery + and the shunt). Battery voltage is between 26V and 27.4V.

I have also almost the same behavior when a charge is occuring : the battery level goes up immediately to 100%.
Any idea where the mistake is? Configuration of the BMV?

Recently, I think I saw the BMV remaining to below 100%, but the battery level was quite low (below 50%, as the voltage was near 25V.


For information, link to the drawing of the installation (sorry, it is a French forum) viewtopic.php?f=84&t=61479&p=679018#p679018
Note: batteries are 24V LiFePO4 models, but not Victron ones, without connected BMS.
Thanks for your help.

BMV Battery Monitor
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1 Answer
Alexandra avatar image
Alexandra answered ·

@play3000

There is a setting under battery settings that allows it to keep SOC from the last disconnect

screenshot-2023-11-14-09-18-34-961-comvictronenerg.jpg


screenshot-2023-11-14-09-18-34-961-comvictronenerg.jpg (279.0 KiB)
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play3000 avatar image play3000 commented ·

Hi
Checked this week-end: the parameter was set to 100% at reconnection. So, I changed it and it looks to be fine now.
Thanks a lot

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kevgermany avatar image kevgermany ♦♦ commented ·
@play3000

It's relatively new, so make sure your BMV is up to date.

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play3000 avatar image play3000 commented ·

Hi,

Thanks, I will check but I think it is alreayd in "Keep SOC". Let you know ASAP (probably no time to go to check installation today).

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