Re: can't get connected if....

On Sun, 30 Oct 2005 15:58:55 -0400, Derek Broughton
<news@xxxxxxxxxxxxxx> wrote:

>Jeff Liebermann wrote:
>
>> Doing the math...
>> Linksys BEFW11S4 draws about 7 watts. At $0.15/kw-hr, that's:
>> 7 watts / 1000 watts * 365 days * 24 hrs/day * $0.15 = $0.92/year
>
>Doing the math, my WRT54G draws an average of 11W (measured, not from
>specs). Over 24 hours, that's 24*11 = 264Wh, of the 1500Wh I generate on
>an average day. Needless to say, it doesn't matter how much those 264Wh
>cost me to generate :-)

Well, if it helps any, your WRT54G will run on any DC voltage between
about 4VDC and 18VDC. Possibly higher than 18VDC as limited by the
unknown voltage rating on the input cazapitor in the power supply
circuit. The WRT54G has a nifty LM2941 switching regulator. I run
some of these on 12V 7A gel cells and solar chargers.

I'm trying to find my measurements of the BEFW11S4 and WRT54G current
drains. It's much less than your measured 11 watts. For example,
see:
http://www.keithl.com/Linksyspower.html
which claims 5.6 watts for the WRT54G. I'm not sure how much the
power xformer contributes, but my guess is about 1-2 watts loss.

Incidentally, I just tried my BEFW11s4 on my Kill-a-watt power meter.
It claims 3 watts (power factor corrected) or 5VA. That's about
right.

LM2941 regulator specs:
http://cache.national.com/ds/LM/LM2941.pdf

Photo of my BEFW11s4 running on 3.7VDC input. It's kinda difficult to
see but full scale on my HP power supply is 7VDC.
http://www.LearnByDestroying.com/pics/drivel/slides/low-volt.html

--
Jeff Liebermann jeffl@xxxxxxxxxxxxxxxxxxxxxx
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
.

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