Hi, I hope to get help on this.
The story so far is.
UPS is 6 years old and at 4 years it threw the replace battery warning so I did with a new set of genuine APC batteries.
13 months later it threw a battery fault so I called APC support who diagnosed the logs and agreed the batteries were bad, I had found 1 of the 4 batteries to be bad so it couldn't hold a load. Another set of batteries were shipped in January.
Upon install it threw a charger overvoltage error but cleared after a braindead as advised as the 1st thing to do on any APC UPS when troubleshooting.
I had not given it any thought since then until it threw another battery fault a month ago, this fault cleared when I manually did a self test, APC checked the logs and agreed to send another set of batteries out as it lasted about a minute on battery power when APC were troubleshooting it with me.
I put the new set in and they read 100%, then the charger overvoltage error again so I did another braindead and off it went again quite happy ( I thought) so I left it at that.
This is when I realised I had a problem, I left the new pack in for 24 hours then did a self test, this went from 100% to around 40% charge on the self test so I left it to charge, all this time the voltage was around 55.4 in the logs, I put the DMM on the front pack and realised they were at 24.2v (so 48.4v combined)
I opened up the UPS and took a direct combined reading from the board to confirm it was about 7v out, same at the big caps that I assume hold enough for it to switch to battery power in an outage..
When you turn it off and pull the batteries then power back up it will hit 55v for a second then drop back down and fail to charge the batteries.
I now have a brand new one sat here that charges and reads the correct voltage but it is the newer model so it has some slight board changes and a newer firmware so many parts can't be swapped over to test.
So after that huge opening post does anyone know what to start looking at for the 7v difference in what the batteries are reading vs what the UPS thinks they are?
the management card sits around 55.4 all the time with the batteries connected so I assume this is whey I can't hear the relay throw in for the charging circuit like my new one?
It seems to think they are fully charged.
The story so far is.
UPS is 6 years old and at 4 years it threw the replace battery warning so I did with a new set of genuine APC batteries.
13 months later it threw a battery fault so I called APC support who diagnosed the logs and agreed the batteries were bad, I had found 1 of the 4 batteries to be bad so it couldn't hold a load. Another set of batteries were shipped in January.
Upon install it threw a charger overvoltage error but cleared after a braindead as advised as the 1st thing to do on any APC UPS when troubleshooting.
I had not given it any thought since then until it threw another battery fault a month ago, this fault cleared when I manually did a self test, APC checked the logs and agreed to send another set of batteries out as it lasted about a minute on battery power when APC were troubleshooting it with me.
I put the new set in and they read 100%, then the charger overvoltage error again so I did another braindead and off it went again quite happy ( I thought) so I left it at that.
This is when I realised I had a problem, I left the new pack in for 24 hours then did a self test, this went from 100% to around 40% charge on the self test so I left it to charge, all this time the voltage was around 55.4 in the logs, I put the DMM on the front pack and realised they were at 24.2v (so 48.4v combined)
I opened up the UPS and took a direct combined reading from the board to confirm it was about 7v out, same at the big caps that I assume hold enough for it to switch to battery power in an outage..
When you turn it off and pull the batteries then power back up it will hit 55v for a second then drop back down and fail to charge the batteries.
I now have a brand new one sat here that charges and reads the correct voltage but it is the newer model so it has some slight board changes and a newer firmware so many parts can't be swapped over to test.
So after that huge opening post does anyone know what to start looking at for the 7v difference in what the batteries are reading vs what the UPS thinks they are?
the management card sits around 55.4 all the time with the batteries connected so I assume this is whey I can't hear the relay throw in for the charging circuit like my new one?
It seems to think they are fully charged.
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