Nut upsuser - Jul 2009 - Accurate battery reports? (HP R3000 XR)

Hi

I have a HP R3000 XR UPS which NUT never says is at 100% battery.
It seems stuck in 98 or 99 . something percentage.

How accurate should i expect the reports to be? All my other UPSes has  
been and is at 100%, even those i have retired.

My monitor system runs debian. The host that is physically connected  
to this ups runs:
	nut		2.2.2-6.4

The web script runs
	nut-cgi	2.0.4-4



JonB

> Hi
Hi Jon,
>
> I have a HP R3000 XR UPS which NUT never says is at 100% battery.
> It seems stuck in 98 or 99 . something percentage.
>
> How accurate should i expect the reports to be? All my other UPSes has
> been and is at 100%, even those i have retired.
>
This is something I have noticed during testing of the driver.
My PW5115 is only going up to 90% and the PW5125 is at 98%.
This is reported from the ups and i am not sure how this is  measured. 

But in the config of the ups you have possibility to set the 
'Max Battery Equalize Voltage' this is the highest voltage the battery
get charged to.

Protocol and info is now public at 
http://www.networkupstools.org/protocols/eaton/
 
The problem is at the moment the driver does not support setting this
parameter. I hold back on this as it may damage the ups if it is not done
in the right way. 

But you may hook up the settings program from powerware (Eaton) to
make adjustments.
> My monitor system runs debian. The host that is physically connected
> to this ups runs:
> 	nut		2.2.2-6.4
>
> The web script runs
> 	nut-cgi	2.0.4-4
>
If you can try the new 2.4.1, you have some more info from the ups, and better
support for load-segments. And it would be fine for me if you can test it so 
it don't break the function of the HP XR series.

Regards
Kjell

Citeren Jon Bendtsen <jbendtsen op laerdal.dk>:
> I have a HP R3000 XR UPS which NUT never says is at 100% battery.
> It seems stuck in 98 or 99 . something percentage.
Please mention the driver you're using when asking for help.
> How accurate should i expect the reports to be? All my other UPSes  
> has been and is at 100%, even those i have retired.
Most drivers will report the value received from the UPS directly so  
you would have to ask the vendor/manufacturer about the accuracy of  
the readings. Some drivers attempt to calculate the battery charge  
themselves when the value is not reported by the UPS and generally  
there will be a note in the man page about which algorithm is used then.

For basically all values that are reported, you should be looking at  
changes and trend lines, rather than absolute values. A UPS is not a  
measuring instrument and more often than not, the resolution of  
readings doesn't reflect the accuracy.

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

Hi

NUT cgi started to report the battery at 100% without i remember doing  
anything.


JonB

On 13/07/2009, at 12.43, Jon Bendtsen wrote:
> Hi
>
> I have a HP R3000 XR UPS which NUT never says is at 100% battery.
> It seems stuck in 98 or 99 . something percentage.
>
> How accurate should i expect the reports to be? All my other UPSes  
> has been and is at 100%, even those i have retired.
>
> My monitor system runs debian. The host that is physically connected  
> to this ups runs:
> 	nut		2.2.2-6.4
>
> The web script runs
> 	nut-cgi	2.0.4-4
>
>
>
> JonB

On 26/08/2009, at 12.22, Jon Bendtsen wrote:
> Hi
>
> NUT cgi started to report the battery at 100% without i remember  
> doing anything.
And now it is down to 98.6% no power loss that i know off.



JonB