Nut upsdev - Dec 2008 - Battery Volts shown as 20+ on Cyber Power UPS CP1000AVRLCD [ DATA ]

Citeren "David C. Rankin" <drankinatty at suddenlinkmail.com>:
> 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)
Apparently I wasn't clear enough with my instructions. We need the  
measured battery voltage under load here and the value the UPS is  
reporting at the same time. There probably won't be much of a  
difference for the float (fully charged) voltage, but there will be  
when it is (almost) empty.

Probably the easiest way to measure this, would be to run 'upslog'  
while at the same time looking at the voltage on your multimeter.  
You'll need to watch the battery.voltage parameter, which is not in  
the default set of variables that is monitored by 'upslog'. The  
following line should report this:

upslog -l- -i 10 -f "%TIME  @H:@M:@S%  %VAR battery.voltage%" -s
ecstasy_ups

It will run in the foreground until you stop it with ctrl-C. Leave the  
multimeter connected and report both values (multimeter and upslog)  
when the battery is almost empty.

Best regards, Arjen
-- 
Please keep list traffic on the list

----- Original Message ----- 
From: "Arjen de Korte"
Apparently I wasn't clear enough with my instructions. We need the
measured battery voltage under load here and the value the UPS is
reporting at the same time. There probably won't be much of a
difference for the float (fully charged) voltage, but there will be
when it is (almost) empty.

Probably the easiest way to measure this, would be to run 'upslog'
while at the same time looking at the voltage on your multimeter.
You'll need to watch the battery.voltage parameter, which is not in
the default set of variables that is monitored by 'upslog'. The
following line should report this:

upslog -l- -i 10 -f "%TIME  @H:@M:@S%  %VAR battery.voltage%" -s
ecstasy_ups

It will run in the foreground until you stop it with ctrl-C. Leave the
multimeter connected and report both values (multimeter and upslog)
when the battery is almost empty.

Best regards, Arjen
____________

Yikes,

    You mean I need to pull the battery, leave the cables connected and get 
the measurements while the computer is on battery power and discharging for 
both actual and indicated! OK, I understand now and I'll test it again 
tonight. However, I did take a look at the voltage and it is linear as you 
suggest with the a=m(x)+b  See:

http://www.3111skyline.com/download/ups/CyberPower/nut_charge-voltage.jpg

    So aside from the comparison of discharging actual vs. indicated, we 
have everything else, right?

P.S. all of my messages are going to the list with the one exception of the 
reply concerning images that was not relevant to this topic. Do you want 
them to only go ot the list and not the address I get when I hit reply?

--
David C. Rankin, J.D., P.E.
RANKIN LAW FIRM, PLLC
510 Ochiltree Street
Nacogdoches, Texas 75961
(936) 715-9333
(936) 715-9339 fax
www.rankinlawfirm.com
--