Hi! Here’s another UPS review😉 I am not an UPS tester by profession, but this topic seems to be around me recently, caused by various opportunities. This time I am playing with APC Smart SC1000 tower/rack-mount unit, and it’s nut interoperation.
The unit comes with two data cables, one is RS-232 to RS-232 and the other is RS-232 (ups side) to USB (host side). The USB device is detected as:
067b:2303 Prolific Technology, Inc. PL2303 Serial Port
So it is actually a serial device. The driver to use is apcsmart with one significant setting:
port = /dev/ttySx port = /dev/ttyUSBx port = /dev/serial/by-id/usb-Prolific_Technology_Inc._USB-Serial_Controller-if00-port0
Remember that the serial device must be accessible by the uid which nut driver is running with. Try an udev rule.
Here’s the upsc output:
# upsc apc1000 battery.alarm.threshold: 0 battery.charge: 012.0 battery.charge.restart: 00 battery.date: 10/06/11 battery.runtime: 600 battery.runtime.low: 120 battery.voltage: 24.44 battery.voltage.nominal: 024 device.mfr: APC device.model: Smart-UPS SC1000 device.serial: 5S1141T08304 device.type: ups driver.name: apcsmart driver.parameter.pollinterval: 2 driver.parameter.port: /dev/serial/by-id/usb-Prolific_Technology_Inc._USB-Serial_Controller-if00-port0 driver.version: 2.4.3 driver.version.internal: 2.03 input.frequency: 50.00 input.quality: FF input.sensitivity: H input.transfer.high: 253 input.transfer.low: 208 input.transfer.reason: simulated power failure or UPS test input.voltage: 242.0 input.voltage.maximum: 242.0 input.voltage.minimum: 242.0 output.voltage: 242.0 output.voltage.nominal: 230 ups.delay.shutdown: 060 ups.delay.start: 000 ups.firmware: 737.3.I ups.id: theups ups.load: 011.0 ups.mfr: APC ups.mfr.date: 10/06/11 ups.model: Smart-UPS SC1000 ups.serial: 5S1141T08304 ups.status: OL ups.test.interval: 1209600 ups.test.result: NO
Here’s the upsrw output:
# upsrw apc1000 [battery.date] Battery change date Type: STRING Value: 10/06/11 [ups.id] UPS system identifier Type: STRING Value: theups
And here’s the upscmd output:
# upscmd -l apc1000 Instant commands supported on UPS [apc1000]:calibrate.start - Start run time calibration calibrate.stop - Stop run time calibration load.off - Turn off the load immediately shutdown.return - Turn off the load and return when power is back shutdown.stayoff - Turn off the load and remain off test.battery.start - Start a battery test test.battery.stop - Stop the battery test test.failure.start - Start a simulated power failure test.panel.start - Start testing the UPS panel
Tested and working commands: shutdown.return, test.battery.start, test.failure.start, test.panel.start; other commands not tested – I have learned a lesson recently.
And as before, here are a few graphs displaying charging and discharging data with ups.load about 13-15:
The runtime seems to stabilize after about 6 hours, however battery voltage is further increasing slowly.
A discharge cycle has run for about 54 minutes and it was interrupted manually – battery voltage was going really low and I did not want to risk it’s life. However I did one or two discharge cycles before this plotted version, and the UPS successfully shut-off itself with a higher battery.voltage. Therefore I could have been safe, but did not want to take any risk anyway.
UPS started to signal low-battery (LB) after 39 minutes (~2350 sec), but lasted at least 15 minutes after. This may or may not be your case, my previous run proved about 5 minutes on LB before automatic shut-off.
To summarize – it is a very good UPS, behaves reliably and it’s interoperation with nut is just excellent with apcsmart driver.