[Nut-upsuser] Ablerex MARS

[Peter Selinger]

I have no opinion on computing the charge from the voltage; it does
not actually matter, the only charge nut really cares about is "too
low".

However, seeing a maximum voltage of 3V on a unit that is nominally
96V seems wrong, even if that is 8 batteries of 12V each. Could there
be a conversion error? Perhaps 2.3V should be 23V? 

-- Peter

Carlos Rodrigues wrote:
> 
> Right now megatec just calculates a linear approximation. It doesn't
> give accurate values, but it is enough to have a fuzzy idea of the
> charge left (like saying "it's almost noon" instead of "it's 12:45"),
> and I'm not seeing how to plot a more accurate charge that fits all
> the models that megatec is supposed to support (especially given I'm
> no electrical engineer).
> 
> Now, I've introduced these values to megatec, and I've commited it to
> SVN. Can you (not Charles) check if they are acceptable now?
> 
> On 4/22/06, Charles Lepple <clepple at gmail.com> wrote:
> > On 4/22/06, lonely wolf <wolfy at nobugconsulting.ro> wrote:
> > > The voltage doesn't look to have a linear dependency with the charge ..=
> .
> >
> > Here's the charge curve used by the Tripp-Lite driver:
> >
> >    http://boxster.ghz.cc/projects/nut/browser/trunk/drivers/tripplite.c#L=
> 456
> >
> > Generally speaking, measuring the voltage to find charge is a bit
> > problematic unless you take into account the amount of current flowing
> > in or out of the battery as well (a real-world battery has non-zero
> > Thevenin resistance, so it is not a pure voltage source). The best you
> > can do is plot voltages over time (as reported by the UPS), and try to
> > fit the curve.
> >
> > --
> > - Charles Lepple
> >
> > _______________________________________________
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> > Nut-upsuser at lists.alioth.debian.org
> > http://lists.alioth.debian.org/mailman/listinfo/nut-upsuser
> >
> 
> 
> --
> Carlos Rodrigues
> 
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