[Nut-upsuser] HP R1500 G2 UPS

Kjell Claesson kjell.claesson at epost.tidanet.se
Thu Feb 18 20:24:55 UTC 2010


> Citeren Jon Bendtsen <jbendtsen at laerdal.dk>:
> > I have a R3000XR, and i use bcmxcp using a seriel port out, since i
> > can not find a USB port on the UPS.
> > 
> > I do have a USB2serial on the host.
> > 
> > I still experience that NUT upsstats.cgi says the UPS battery is at
> > 97%, and some days later at 100%. It happens regularly.
> The bcmxcp driver reports directly what the UPS is telling us. If the
> algorithm used for battery charge calculation is voltage based (not
> entirely unlikely), small variations in the battery voltage may make
> it jump between two fixed values all the time. I have a very strong
> opinion about 'correcting' such behavior, since it can also be an
> indication of imminent battery failure.

Totally agree with Arjen.
When on line it is more of a voltage reading. And set the cell voltage to
about 2.26 when on 100%. But it is not a direct voltage reading.
It depends on where it land, when it change to floating.

For example: If I do a battery test, it drop to about 80% before
end. Then it start charging. But the % don't follow the voltage.
I have 24 volt nominal so it is on 95% from about 26.5 to 27.3.
Then when it goes to floating it drop to about 27.07 and say 99%.

If it drop much when floating you get a low % reading, and as Arjen
say it may indicate a bad cell. ( I know as I experienced that).

BUT when it change to battery, the meter indicate remaining runtime
in %. So start fixing this would make more damage than help. 
This is calculated during battery test. So if you have strange or
large run-time numbers, do a battery test.

(see page 115 of  XCP Rev C.doc)


More information about the Nut-upsuser mailing list