[Nut-upsuser] My Back-UPS RS 1000 went haywire, any ideas?

[Gennadiy Poryev]

Hi,

I am sorry for possible offtopic as this question is not quite 
NUT-related but I cannot imagine any other place with people of such 
deep and intimate knowledge of UPS behavior.

One day all of a sudden my APC Back-UPS RS 1000 refused to go online 
(green led) even though mains was connected. I used upsc to see what is 
going on, and ups.status was "OB DISCHRG", battery.charge was slowly 
decreasing and input looked like this

input.sensitivity: medium
input.transfer.high: 264
input.transfer.low: 194
input.voltage: 182.0
input.voltage.nominal: 230

I took an external voltmeter and made sure that actual input voltage is 
around 223 V and is not changing. However, each successive run of upsc 
indicated drastically different "input.voltage", arbitrarily jumping 
from 160 V to 280 V. Besides this, no other values seemed abnormal.

Is this something that can be fixed in-house? Or something widely known 
about this particular model and/or vendor? I'm puzzled. Please, advice. 
Sorry for the offtopic once again.
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battery.charge: 49
battery.charge.low: 10
battery.charge.warning: 50
battery.date: 2001/09/25
battery.mfr.date: 2007/07/20
battery.runtime: 6339
battery.runtime.low: 120
battery.type: PbAc
battery.voltage: 24.9
battery.voltage.nominal: 24.0
device.mfr: American Power Conversion
device.model: Back-UPS RS 1000
device.serial: 8B0729R16742
device.type: ups
driver.name: usbhid-ups
driver.parameter.pollfreq: 1
driver.parameter.pollinterval: 1
driver.parameter.port: auto
driver.parameter.synchronous: auto
driver.version: 2.8.0
driver.version.data: APC HID 0.98
driver.version.internal: 0.47
driver.version.usb: libusb-1.0.26 (API: 0x1000109)
input.sensitivity: medium
input.transfer.high: 264
input.transfer.low: 194
input.voltage: 182.0
input.voltage.nominal: 230
ups.beeper.status: disabled
ups.delay.shutdown: 20
ups.firmware: 7.g9a.I
ups.firmware.aux: g9a
ups.load: 1
ups.mfr: American Power Conversion
ups.mfr.date: 2007/07/20
ups.model: Back-UPS RS 1000
ups.productid: 0002
ups.realpower.nominal: 600
ups.serial: 8B0729R16742
ups.status: OB DISCHRG
ups.test.result: No test initiated
ups.timer.reboot: 0
ups.timer.shutdown: -1
ups.vendorid: 051d