"Does VEC1093DBD's equalize mean stir? I thought it only takes about 15min to stir, not 7 hours."
No, Equalize on this charger means after the battery is "full" using the normal charging mode, you can do a top charge where the voltage goes to temp corrected 15.7v nominal and it does another recharge from there starting at 4.1a, which then taper until the charger says FUL again. This can take as long as it takes depending on the battery.
In effect, this lets you perform the charging profile recommended here for 6s which wants you into the 15s whereas the solar controller high set point probably does not. (which is the problem I was having--except also you trigger your inverter over-voltage alarm at 15v if your are camping and connected, so it is inconvenient)
http://www.wholesalesolar.com/pdf.folder/battery-folder/charging_instruction_2011_2.pdf"Recondition" is a pulse method of desulphation that runs for about 24hrs and then shuts off. It does not raise battery voltage. You are supposed to run two or three of these in a row on stubborn cases.
This method is usually regarded as unproven or dubious by battery info blurbs. I find it seems to work somewhat when alternating with Equalizing. Gradually, the high point for SG gets higher. Trouble is it takes several days--PITA. Which is why I stopped trying to keep my 27DCs going and got 6s which don't need all that because they gas more and it is easy for the 1093 to get them back to 100% baseline SG.
I hope the previously enjoyed T-1275s don't act like those 27DCs did, but we'll see. These 12s are true deep cycles where the 27DCs were "starting-deep cycle"
Also PT keeps saying 12s are better than 6s for running bigger inverter loads. Perhaps they are also better suited to shallow cycle solar ops doing 85-97s like I seem to be doing than the 6s. I know the 6s like a good cycle down to 50% and a recharge every so often but this is hard to do if it stays sunny.
None of which answers the OP question about the initial 5% discharge being uneven etc. More of an excuse to re-issue the warning about daily solar to "full" not getting you back to "real full" and you still need to do the top-charging as recommended in that US Battery link.
