My batteries have a reset pinhole switch on the bms. I have 6x 7kwh lifepo4 48v in parallel. 3 batteries are showing around a 20% difference in soc compared to tje otjer 3. Last week when we had plenty of sun, all 6 batteries reached 100% but during the last several cloudy days im now down to 30%soc on my vrm display, but the batteries are indicating about a 20% imbalance, so im wondering if resetting the 6 bmses might make them indicate a more truer soc.
If resetting can help, at what soc should i perform the reset?
You would have to read the manual for your battery.
It is quite possible that with less than optimal wiring practices there will be differences in current flow between the batteries, leading to differences in Soc between batteries.
Have a look at Wiring Unlimited for ideas. Battery leads should have the same length and be properly cross diagonally connected to the buss bars for equal current sharing between batteries.
Grab a clamp meter and check the current between batteries is equal during charge/discharge.
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M wireing is exactly the same length for all the batteries and they ate all connected to a common busbar.
I have tested with a dc clamp meter and they do however read different amounts of current, i.e. 2.7A, 2.5A, 2.6A, 2.3A etc.
Also there is no mention in the battery manual regarding the reset hole it has.
They are Rahvolt Chinese batteries and also impossible to get plain answers via email from them.
All the cable/crimp connections are good?
All connections torqued up properly?
Crimps and buss bars flat and without corrosion or burs?
Battery cables cross diagonally connected to the buss?
I would have tested at a much higher current.
500 odd watts is not much of a load.