question

daren-connor avatar image
daren-connor asked

SOC in VE Bus is not matching the battery

I have 3 x 48/5000/70 multiplus in a 3 phase configuration which is fed by a 15kw Fronius 3 phase solar inverter.

Lately the SOC in VE Bus does not match the batteries. This causes the SOC to stop st 90% SOC when the batteries are at 57.6v which is the absorption voltage. Sometimes it will sit at 90% for 3 or more hours waiting for the batteries to meet the SOC before going into absorption. I've tried everything I can think of but I'm obviously missing something. Even my installer is at a loss. Can someone please help. Thanks in advance...

battery chargingSOCVE.Bus
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1 Answer
Mark avatar image
Mark answered ·

Most likely your current battery monitor settings in VE.Configure are inappropriate for your battery bank.

Regardless what settings you expect have been copied over from the original FW, as the new FW is so much newer maybe that didn't totally work.

Specifically check the 'battery capacity' and the 'charge efficiency'.

It is likely that the battery capacity is set too low and possibly charge efficiency is set too high.

There is a setting 'state of charge when bulk finished' and it sounds like you have it set to 90% SOC (which is reasonable) - so the battery monitor is correctly following this logic. The issue is that it's not accuracy tracking the batteries true SOC % well.

Lastly, do you have any DC loads powered by the same battery bank? As the VE.Bus battery monitor would not consider these loads in the SOC % calculations.


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Related Resources

Additional resources still need to be added for this topic

VictronConnect VE.Bus charging manual  

What is VE.Bus?