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blieve avatar image
blieve asked

Overvoltage when keep batteries charged is on

Hi,

I noticed since a few days that the charge logic is not being followed sometimes when the systems is in "Keep batteries charged" mode. See below charts

1716461576669.png

DVCC is on and the bms is sending the correct charge voltages.

The pack itself is perfectly balanced within a few millivolts.

It happens when there is a peak in solar production, altough everything is connected on the AC side. (No DC MPPT's and DC system is turned off). I would expect that the grid feed-in would just increase instead of overcharging the batteries.

Is there any explanation or setting that I missed?


Thanx,

Bjorn

Multiplus-IIESS
1716461576669.png (77.7 KiB)
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blieve avatar image blieve commented ·
@Guy Stewart (Victron Community Manager) someone from Victron able to shine a light on this?
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pf-1 answered ·

The maximum charging voltage is also exceeded in my installation when "keep batteries chared" is activated.
However, I do not use the DVCC value "Maximum charging voltage", but the internal settings of the Multis/Quattro.
I use the SmartShunt as the battery monitor and no controlling BMS.
If the "Optimized for battery life" setting is selected, everything works perfectly.
I have the feeling that it somehow has to do with the SVS, which I have activated so that the Multi/Quattro regulates to the actual battery voltage.

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