Hi folks. I'm running into a few troubles where I can't seem to bleed off enough power to get 2 low cells to come up.
Attached are a couple of screenshots. I charge to 55.5v absorption setpoint and I have a 12 minute CV period (absorption timer) before I drop to float. I use an outback FM60 with no RTS compensation.
I use auto levelling at >85% SOC but I'm not sure what I should set my balance voltage to. I would expect, given I have my setpoint at 55.5, my cells wouldsettle on 3.46v/cell when it is at absorption. But often I get a few cells start to nudge above that even when the blockmons are running at full capacity and cell 6 and 14 don't come up.
Cell 6 and 14 aren't particularly weak, they hold up well when subjecting the pack to reasonable discharge loads (50a), they just don't want to come up very easily.
I've been playing with the balance voltage this summer, tweaking it up and down a few .1's of a volt, at the moment it's at 3.49 iirc. Does this seem sensible?
Cells are 10 year old CALB 210aH but they had low cycles on them - came from an Allied electric peugeot boxer that had a failed BMS.
Attached are a couple of screenshots. I charge to 55.5v absorption setpoint and I have a 12 minute CV period (absorption timer) before I drop to float. I use an outback FM60 with no RTS compensation.
I use auto levelling at >85% SOC but I'm not sure what I should set my balance voltage to. I would expect, given I have my setpoint at 55.5, my cells wouldsettle on 3.46v/cell when it is at absorption. But often I get a few cells start to nudge above that even when the blockmons are running at full capacity and cell 6 and 14 don't come up.
Cell 6 and 14 aren't particularly weak, they hold up well when subjecting the pack to reasonable discharge loads (50a), they just don't want to come up very easily.
I've been playing with the balance voltage this summer, tweaking it up and down a few .1's of a volt, at the moment it's at 3.49 iirc. Does this seem sensible?
Cells are 10 year old CALB 210aH but they had low cycles on them - came from an Allied electric peugeot boxer that had a failed BMS.