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Re: quick numbers for electrical usage

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  • blpasemann
    Don t forget about the P3 Kill-A-Watt meter. Very cool device to measure how much power something uses over time. I bought mine on Ebay last year and I love
    Message 1 of 3 , Jul 7, 2006
      Don't forget about the P3 Kill-A-Watt meter. Very cool device to
      measure how much power something uses over time. I bought mine on
      Ebay last year and I love it. They don't make one for 220 yet.

      http://www.p3international.com/products/special/P4400/P4400-HG.html

      Thanx



      --- In hreg@yahoogroups.com, Paul Archer <tigger@...> wrote:
      >
      > I calculated this for my own use, and thought it would be helpful for
      > others.
      >
      > $.14/kwh (going rate in Houston)
      >
      >
      > 120 watts * 24 hours/day * 30 days/month = 8,640 watt hours / month
      > 8,640 watt hours / month = 86.4 kwh / month
      > 86.4 kwh * $.14/kwh = $12 / month
      >
      >
      >
      > So, if you have a 120V appliance/lamp/whatever that uses 120watts of
      power
      > (for instance, a light fixture with 2 60 watt bulbs), and you leave
      it on 24
      > hours a day, it'll cost you $12 a month.
      >
      > Since 120 watts at 120V is 1 amp, if you do measurements at your
      breaker box
      > (using a clamp-on amp meter, or "clampmeter"), you can see that each
      amp of
      > measurement (assuming it's for a constant, 24 hour/day load) will
      cost you
      > $12/month.
      >
      > You can extrapolate this, of course. For instance, if you have a
      light with
      > a 60 watt bulb, and you have it on for about 6 hours a day, it'll
      cost you
      > about $1.50 a month.
      > Or, if you're like me, and you have a couple of computers that you
      leave on
      > 24/7, and they draw around 3 amps total, then that's costing me about
      > $36/month to run them.
      >
      >
      > Paul
      >
      >
      >
      >
      > ----------------------------------------------------------------
      > "All right...initialize the GBL."
      > "How do you do that, then?" Terry Pratchett
      > "It...it means pull the great big lever." from "Hogfather"
      > ----------------------------------------------------------------
      >
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