: > :
: > : > 24 watts divided by 1000 equals .024 KW times 1 hour
: > .024 KWH times
: > : > 10 cents per hour would cost you .0024 cents to operate
: > one hour. I
: > : > think.
: > :
: > : Just a nit: You multiplied by 0.1 to get the final answer,
: > which works
: > : for dollars but not cents. So, .0024 dollars/hr, or .24
: > cents/hr.
: > : Small change either way.
: > :
: > : For general electric costs rule-of-thumb, I use the 100W
: > lightbulb, at
: > : $0.10/kWH (common rate in the U.S.), and 1 month (electric
: > : frequency), to come up with:
: > :
: > : 0.1kW * 1 month * 30 days/month * 24 hrs/day * $0.10/kWh
~: > $7/mo.
: > :
: > : So, $7/mo. to run a 100W device all the time. Most
: > and duty
: > : cycles can be scaled to this benchmark pretty easily.
: > Basically true for an incandescent light bulb. I went out
: > bought a watt/VA meter one of the guys here suggested - and
: > be surprised how far off that same 100W calc is if the load
: > inductive. Depending, I'm seeing power factors so far as low
: > 58% to around 80%, which will throw off your calcs over the
: > of months or a year.
: At least in the US, residential customers are charged for
: They are not peanalized for crappy PF. Many corporate customers
: > That meter's a nice little gizmo for $30 and seems to be
: > pretty accurate to boot. No specs with it, but I did check
: > some calcs, plus what my UPS measures the line stuff at -
they lined up
: > very nicely; less than 4% diff and I'm sure the UPS ain't all
: > accurate as a rule either. How's that for a scientific
: > check <g>?
: > Also, if you're playing with duty cycle, you don't multipy
: > 24 x 7 etc.; that's a 100% duty cycle on your assumption of
: > having a power factor of 1.00.
: > For an electric bulb though, you'd be real close. But
: > refrigerator, furnace, flourescent, things like that it's
: > different story.
: > It's been interesting if nothing else, and might save a
: > or two over a year; making it worthwhile.
: A thou or two over a year? Your bill must be mighty big! ;-)
: are only charged for watts. The PF is irrelevant here (not so
: UPS though).
THOU?!?!?!? Who said that!! Me????? Jeez, I don't recall what
I meant to say but if I could do that, I'd go into business
selling the idea to others!!
Typo obviously <g>. Err, not, it wasn't either! Send me
$11.95 in a SASE and I'll tell y'all how ta do it! ;-} Now,
where'd I lay that gizmo? Hmmm ...