I have 2 identical battery banks. Each lifeline AGMs 900Ah.
They each have their own BMV 712 Smart. They both show the same readings, though the SOC % slowly drifts apart a little until I equalize.
I also have a 'Master BMV' this always shows a different V usually around 0.1 lower.
So at the moment the BMVs are showing 12.66 for each bank and the master is showing 12.58. The voltage at the bars where all the large wires come into with the fuses is 12.62.
From this I am assuming that the individual BMVs are showing the correct V.
And charging the batteries on this reading.
Is that correct?