I have tried all different combinations in the settings menu to avoid the high voltage alarm alert, but im still getting this alert, even though the bms’s are shutting down to stop charging to protect the batteries and system , ive been getting this alarm several times a day because the batteries cycle between 100% and 97%. Once they reach 100% soc the mppts shut down and im switched to discharge mode of the battery bank, until it drops to 97% then the mppts kick back in and charge the batteries and supply my loads. Btw is this behaviour normal?
So during the charging period im regularly getting the high voltage alarm alert, but not every time.
Being that the bms’s are protecting themselves, and i cant stop this alert, is there an option to disable it?
This is normal, and I’m not aware of a way to disable it.
You could lower your absorption voltage so the BMS does not get a cell overvoltage alarm.
The downside is that the voltage needs to be high enough to support cell balancing, which depends on the implementation details of the BMS.
If you have a 48V 16s system, try setting the absorption voltage to 55.1V, and see if you get to 100% charge without an alarm. Then keep adding 0.1V until the alarms come back, then back off. If not, divide the 55.1 by 2 or 4 for 24v or 12v battery systems.
The way to limit this is by limiting the maximum charge voltage to a value below that called for by the BMS. This is not an unusual issue.
Procedure is:
Navigate to Settings>system Setup>Charge Control
DVCC should be forced on.
go to the “limit managed battery charge voltage” and turn on the slider.
Lower the set voltage by about 0.5V, so it should be typically set at 55.5V This can then be adjusted up or down by 0.1V steps until the high volt warning alarms don not come on, but the voltage is set as high as needed.