power meters [ was low power linux PC? ]

[Drew Van Zandt]

The Kill-a-watt loses all data on power loss; the other does not.  Also, the
displayed resolution on the kill-a-watt is a bit coarse for things like wall
warts, though it apparently has higher internal resolution.  I found it
necessary to run a wall wart off of one for a full 48 hours to get
repeatable results that agreed with manual calculations using data from a
pair of multimeters.  The inaccuracies were within 1/2 displayed LSB, but at
very low currents that's HUGE.

I don't know if the more expensive one has higher display accuracy, however,
so it might suffer from the same issue.  I can only speak for the one I own,
and point out that it would take a LOT of increased power savings to justify
the more expensive one.

--DTVZ

On Mon, Apr 7, 2008 at 11:53 AM, Paul Lussier <p.lussier at comcast.net> wrote:

> Alex Hewitt <hewitt_tech at comcast.net> writes:
>
> > I believe this item,
> > "http://www.thinkgeek.com/gadgets/travelpower/7657/" that measures power
> > consumption might have been discussed on the list before but the same
> > folks now offer a more sophisticated model:
> >
> > http://www.thinkgeek.com/gadgets/travelpower/7acf/
>
> I'm curious what the major differences between these two are.  The
> former costs $129.00, the latter $24.99.  Is it that the Watt's UP!
> model records and stores info whereas the Kill'O'Watt merely displays
> the current stats?
>
> And, does anyone know of something like this that measures 220VAC as
> well?  (I'd really like to know what my stove and clothes dryer cost
> me :)
>
>
> --
> Seeya,
> Paul
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