Another update!
Top Balancing completed (extremely long process for a bank of this capacity despite most cells were at 3.60v) then using my 6a PS it totalled a tad over 6 hrs to bring all cells equally to full capacity!
But the first capacity test wasn't too impressive slightly disappointing ?.
However the cells were discharging equally within each battery and depending on which BMS I selected for monitoring the cell imbalance were 0.005v , 0.010v , 0.011v and 0.004v.
One thing I noted was as the bank discharged from 2% to 0% (edit: 2% to 0%=cell capacity) the cell imbalances climbed and alternated between 0.004v and 0.102v.
(However, as the bank is currently recharging a good thing to note is all cells have returned to their original minimal cell imbalance readings as listed above)
My setup is temporary during testing phases on my table top, all leads are approximately same length, and only 3ft lengths at 35mm² x 2 (75mm² total) connecting the inverter/charger to the battery bank bus bars, and using custom made bus bars to connect the battery bank in parallel to complete the bank. The bus bar is 25mm X 3mm (75mm²) copper.
My set up of four 280ah batteries @ gives a total of battery bank capacity of 1,120ah.
My initial test results maxed out at 1,089ah ?.
I'm going to repeat the test after the loooonng recharge to full capacity of my bank.
I'm using my Victron BMV 712 BM and shunt for this capacity test. It's relatively new and only in use for the past two months on board.
And I disconnected and removed it from my boat for the testing phases as this is an extremely accurate piece of equipment.
And while I inputted the correct settings for my LiFePO4 cells (as opposed to the lead acid that's its measuring presently) I then made the rookie mistake of forgetting to actually "reset history", so I'm going to hold my hand up and suggested that maybe the lack of resetting has somehow given me an inaccurate reading??
I'm open to opinions here though ?