I have an APC UPS that sorta does the opposite thing to what it should: it can randomly die and start screaming, cutting the power supply of my PC. The PC works fine when connected to a regular socket. The issue arose after several years of use, so I thought it was time to change the battery. However, it now happens with the new one as well.
The behavior seems completely random: unrelated to any problems with the electricity or PC load. It can even happen when the PC is off, in the middle of the night. The only thing that helps to stop the alarm then is unplugging the PC from the UPS or turning off the switch on the power unit of the PC.
I figure, if it "feels" the PC connected to it even when it's off, there must be an accumulated charge in the power unit or something. Although, it may be normal. I haven't replaced the power unit of the PC since I started using the UPS.
Does anyone have any thoughts on what can be wrong? I'm inclined to blame the UPS itself. I heard it could be due to insufficient power, but I tried to put the PC under stress, it didn't trigger the problem.
Edit: I've installed
apcupsd, here's the current output of
APC : 001,034,0863 DATE : 2012-07-01 16:54:03 +0400 HOSTNAME : lev-home VERSION : 3.14.10 (13 September 2011) debian UPSNAME : Back-UPS CABLE : USB Cable DRIVER : USB UPS Driver UPSMODE : Stand Alone STARTTIME: 2012-07-01 16:54:01 +0400 MODEL : Back-UPS ES 700 STATUS : ONLINE LINEV : 244.0 Volts LOADPCT : 0.0 Percent Load Capacity BCHARGE : 100.0 Percent TIMELEFT : 43.8 Minutes MBATTCHG : 5 Percent MINTIMEL : 3 Minutes MAXTIME : 0 Seconds SENSE : High LOTRANS : 196.0 Volts HITRANS : 256.0 Volts ALARMDEL : No alarm BATTV : 13.5 Volts LASTXFER : No transfers since turnon NUMXFERS : 0 TONBATT : 0 seconds CUMONBATT: 0 seconds XOFFBATT : N/A STATFLAG : 0x07000008 Status Flag SERIALNO : 5B0807T16145 BATTDATE : 2008-02-13 NOMINV : 230 Volts NOMBATTV : 12.0 Volts FIRMWARE : 829.D2 .I USB FW:D2 END APC : 2012-07-01 16:54:17 +0400