[Nut-upsdev] Battery Volts shown as 20+ on Cyber Power UPS CP1000AVRLCD [ DATA ]

[David C. Rankin]

David C. Rankin wrote:
> Arjen de Korte wrote:
>> The only calculation that is involved is done in the UPS. Per the HID
>> PDC specification, NUT reports the HID path
>> 'UPS.BatterySystem.Battery.Voltage' as is. As such, the firmware in your
>> UPS is broken, as it doesn't meet the HID PDC specifications. Complain
>> to TrippLite if you wish.
>>
>> Most likely, this will indeed require a correction to get to the actual
>> battery voltage. We already knew that and most likely this will require
>> two parameters in first order equation to get to
>>
>>     battery.voltage = A x reported value + B
>>
>> where A and B are to be determined. Which brings us to the problem that
>> we will need at least two sets of reported versus actual battery.voltage
>> to get to these. It could be that A is 1 and B is -8 (your guess now),
>> but we would need some measurements with a sufficiently accurate
>> measuring device to find these.
>>
>> The person that reported this issue before was either unwilling or
>> unable to provide these, so unless you are, this is likely going to stay
>> that way. If you're willing to work with us to solve this, please do.
>> There already is a battery scaling for some other TrippLite units, so we
>> could easily add this.
>>
>> In any case we'll need the output of 'lsusb' and the output of the
>> 'usbhid-ups' driver running with debug level 2 (not higher).
>>
>> Best regards, Arjen
> 
> Arjen,
> 
> 	All data has been collected. Here is the data to help straighted out the
> indicated battery.voltage problem with the Cyber Power UPS CP1000AVRLCD output:
> 
> Full Charge battery.voltage:
> 
> 	20.3 Volts - (indicated upsc output)
> 	13.72 Volts  (actual measured with multimeter across battery terminals)
> 
> Discharged battery.voltage:
> 
> 	17.4 Volts - (indicated on shutdown, discharging battery.charge 77%)
> 	16.9 Volts - (indicated on shutdown, discharging battery.charge 51%%)
> 	16.6 Volts - (indicated on shutdown, discharging battery.charge 33%)
> 
>      -- Shutdown Occurred at < 3% -- Battery Removed and Tested --
> 
> 	12.06 Volts  (actual where charge was <= 3%, multimeter measurement)
> 
>      -- Battery Reinstalled -- UPS Charging --
> 
> 	18.4 Volts - (indicated on restart, charging battery.charge: 6%)
> 	18.5 Volts - (indicated on restart, charging battery.charge: 10%)
> 	18.8 Volts - (indicated on restart, charging battery.charge: 33%)
> 	18.9 Volts - (indicated on restart, charging battery.charge: 40%)
> 
> 
> Additional data:
> 
> 	upsc output on discharge with battery.charge 62% -> 33% at 10 second intervals:
> 
> 	http://www.3111skyline.com/download/ups/CyberPower/sdlog
> 
> 	upsc output on charge with batter.charge 9% -> at 60 second intervals:
> 
> 	http://www.3111skyline.com/download/ups/CyberPower/charging_log
> 
> 	The charging_log is still being compiled. The output for both logs is a simple
> dump of the upsc data obtained with the command line:
> 
> while :; do upsc ecstasy_ups at ecstasy.3111skyline.com >> charging_log; done
> 
> 	If you would like me to do additional testing or testing of a patch when it is
> available, I'm happy to do it. Just let me know. It will be great to be able to
> read voltages in the 12-13 volt range instead of the 20 volt range. It will
> make the graphs look a lot better too;-) Thank you for your help!
> 

	The complete charging log is available in a bzip2 file at:

http://nirvana.3111skyline.com/download/ups/CyberPower/charging_log.bz2

-- 
David C. Rankin, J.D.,P.E.      |          openSoftware und SystemEntwicklung
Rankin Law Firm, PLLC           |             Countdown for openSuSE 11.1
www.rankinlawfirm.com           |        http://counter.opensuse.org/11.1/small