[Nut-upsuser] NUT 'upsstats' Battery Meter Question

[Jim Klimov]

Hello Jeff,

  `upsstats` by itself only relays and renders the information provided by
a NUT data server (upsd) and the NUT driver for the device. So you can
revise the specific reported values with e.g. `upsc` command-line client to
be sure.

  What I think happens here is that the driver uses a
`battery.voltage.low/nominal/high` group of readings which does not match
the hardware circumstances well for some reason. These readings can be
provided by a device (and then a 3x12=36V nominal would be reasonable), it
can be imposed in your driver configuration with
`override.battery.voltage.... = ...` lines, and in some but not all drivers
the ranges can be guessed from other information served by the device, as a
fallback.

  Use of overrides is fairly popular, so check if that would help you (and
that you don't have it misleadingly misconfigured already by copy-paste of
an `ups.conf` device section from the internet).

  While at it, check the manual pages for the driver you use - if it
supports a `runtimecal` option. It often comes up in this context, to give
the driver a better grasp at battery discharge dynamics so it can issue the
critical-situation alarms at power loss if the device/protocol lacks the
ability on its own.

Hope this helps,
Jim Klimov


Jim


On Thu, Nov 30, 2023 at 12:57 AM Jeff Rickman <jrickman at myamigos.us> wrote:

> Hello,
>
> I am using Nut 2.8.0 (2.8.0-7 packages) Debian 'Bookworm' in it's Devuan
> form 'Daedalus'.
>
> When I look at my Eaton (ex-MGE Powerware) E5115 UPS boxes in NUT
> 'upsstats" I am confused by the battery readings.
>
> Under the 'System' column I can click on the link and obtain a GUI with a
> few meters.
>
> The NUT 'upsstats' battery voltage meter for these E5115 UPS boxes is
> almost in the lower level RED zone which is just under 40 volts. The GREEN
> zone seems to be 48 to 55 volts with a RED zone above that.
>
> Here's the confusing part: These Eaton E5115 UPS boxes only have 3x 12v
> 9Ah sealed lead-acid AGM battery blocks inside them. I verified that after
> I recently changed out some aged batteries from those boxes. There is no
> room for any more battery blocks in the case.
>
> NUT 'upsstats' reports the battery voltage as 40.25 volts for 1 of the UPS
> boxes and 39.02 volts for the other UPS box. Those voltages seem reasonable
> (and similar to past results for other battery blocks) for NEW 12v sealed
> lead-acid AGM battery blocks.
>
> When I look at the 'Data tree' link from the NUT 'upsstats' tool I can see
> the organized list of data from the UPS. There does not appear to be any
> upper or lower battery charge limits in that data.
>
> So, how does NUT 'upsstats' figure out it's upper and lower limits and
> where it places it's RED zones? Can these meters be adjusted in some way?
>
> /Jeff/
>
> --
>
>
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