If one battery disables charge the entire parallel bank will hit the charge voltage. Keep lowering it try 54V absorption and increase the absorption time then try raising it. You could try to parallel the bad battery behind a good one so it will charge slower. You won’t damage anything but the voltage is what resets the SOC and resetting at 85% is nowhere near 100% and may cause problems with the estimate of SOC.
This is what a curve should look like. I pulled down to 72% last night and hit 85% at 10am. I did not reach full charge till 2pm so if I had your problem the SOC information would be very innacurate.
Thanks for the info, i just checked my graph and it looks like this today, is it normal looking considering i had a high voltage alarm at around mid day?
i checked the alarm and crossed it off, but the system kept on charging for another our or so until 100% was reached, by that time the pv charger went to 0w and batteries are now being used to power the house, even though the sun is still shining. When it drops to 96%soc the pv charger kickes back on and starts charging again. Is this normal?
If you disconnect it’s positive, from the bus, and insert a really long length of wire, this will add some series resistance, and slow the charging down.
Yes the behavior you describe is normal, the solar charger will shut off until the alarm is no longer active.
Step down your system max charge voltage in the DVCC limits in 200mV steps until you get to the point where the charger ceases shutting down and you don’t get the high voltage alarm. Check the Abs and float voltages set in the charger correspond to this. Eventually the odd battery may balance out.
No, this woin’t slow down charging times. The battery will charge normally to ~95%, then it will slow down as the current limiting comes into effect. This will allow the cell balancing to take place.
