Back-UPS BR 800 (mis) detecting power failure

[Anonymous user]

I have an old Back-UPS BR 800 powering a switch and raspberry pi. This has recently started to frequently decide that the power supply has been interrupted so switches to battery very briefly. I don't think that there is a problem with the incoming power supply. apctest self-test passes with no errors reported.

The output when a failure is detected looks like this (as provided apcupsd):

APC      : 001,046,1117
DATE     : 2017-11-28 18:17:54 +0000
HOSTNAME : garage-pi
VERSION  : 3.14.12 (29 March 2014) debian
UPSNAME  : garage-pi
CABLE    : USB Cable
DRIVER   : USB UPS Driver
UPSMODE  : Stand Alone
STARTTIME: 2017-11-03 12:13:09 +0000
MODEL    : Back-UPS BR  800
STATUS   : ONBATT
LINEV    : 230.0 Volts
LOADPCT  : 8.0 Percent
BCHARGE  : 100.0 Percent
TIMELEFT : 74.0 Minutes
MBATTCHG : 5 Percent
MINTIMEL : 3 Minutes
MAXTIME  : 0 Seconds
OUTPUTV  : 230.0 Volts
SENSE    : Medium
DWAKE    : 0 Seconds
DSHUTD   : 0 Seconds
LOTRANS  : 194.0 Volts
HITRANS  : 264.0 Volts
RETPCT   : 0.0 Percent
ITEMP    : 29.2 C
ALARMDEL : 30 Seconds
BATTV    : 25.3 Volts
LINEFREQ : 50.0 Hz
LASTXFER : Low line voltage
NUMXFERS : 34279
XONBATT  : 2017-11-28 18:17:50 +0000
TONBATT  : 6 Seconds
CUMONBATT: 101707 Seconds
XOFFBATT : 2017-11-28 18:17:48 +0000
SELFTEST : NO
STESTI   : None
STATFLAG : 0x05060010
MANDATE  : 2008-09-01
SERIALNO : 3B0836X03295
BATTDATE : 2014-02-23
NOMOUTV  : 230 Volts
NOMINV   : 230 Volts
NOMBATTV : 24.0 Volts
NOMPOWER : 540 Watts
FIRMWARE : 9.o4 .I USB FW:o4
END APC  : 2017-11-28 18:17:56 +0000

Is this behaviour likely to be a fault that's developed because of the age of the UPS? It's nearly 10 years old so I guess maybe reaching the end of it's life?

[BillP · Accepted solution]

Hi,

Yes it could be caused by the UPS or it could be caused by the incoming power. 1 thing you can try is to lower the sensitivity to see if the issue is resolved. If changing the sensitivity does correct the issue then the UPS is interpreting an issue with the input power. This interpretation could be incorrect or not. Based on the age as with other electronics components can and do fail or it could be slight fluctuations within the AC.