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  1. #1
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    Power Cost Calculations

    How would I figure out how many kW/h a device uses? I want to figure this out so I can get an estimate of how much it'll cost to operate. It's consumtion is 715 Watts. Are there any calculators out there to do this for me?

  2. #2
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    1000 watts per kilowatt.

    715/1000

    0.715 kilowatts of power.. multiply that by the number of hours of use to get kWh

  3. #3
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    And then go to your power companies website or price list and there you have it!

    I had to do the same the other day...

  4. #4
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    Although it says 715 watts doesn't necessarily mean it's using that much power (depending what it is). A more exact method of measuring would be the use of a separate power meter. The devices can be pretty cheap and simply plug into the wall in between the outlet and your device. I've linked to a review of one below as an example, it's simply a result near the top from Google. I have no idea on this particular device's performance, etc.

    http://www.the-gadgeteer.com/review/...monitor_review

  5. #5
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    Yeah... for instance with a clothes drier it depends on the power setting you have it on. Same with most appliances.

  6. #6
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    Originally posted by -T{H}R-
    Yeah... for instance with a clothes drier it depends on the power setting you have it on. Same with most appliances.
    On a more relevant note, idle computers use less than half the power than when they are being used 100%.

  7. #7
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    How is that necessarily more relevant?

  8. #8
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    Originally posted by -T{H}R-
    How is that necessarily more relevant?
    Not everybody uses a clothes drier, etc. Also, it was my guess that the "device" he is talking about was computer-related.

    No harsh feelings ,

  9. #9
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    By idle do you mean in powersaving mode or just when the CPU usage is at 0%?

  10. #10
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    Originally posted by ichris
    Not everybody uses a clothes drier, etc. Also, it was my guess that the "device" he is talking about was computer-related.

    No harsh feelings ,
    I don't own the device yet, as it's $45,000.

    I'd need to colo it in a building somewhere here in the city, so I wanted a rough figure so I could offer to pay for it's power usage.

    I can't figure out how to calculate this. So if it uses 715 watts we'll say, and the rate I pay is $0.068/kWh, how much will it cost to run per year?
    Last edited by MStar; 07-09-2005 at 12:34 AM.

  11. #11
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    How many hours will you use it for per day/week/year?

  12. #12
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    It'd be on 24/7/365.

  13. #13
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    Ouch.

    I make it:

    24 (hours) x 365 (days) = 8760 (amount of hours in year)

    8760 x .715 (usage per hour) x .068 (price per kw/h) = $425.9112 (roughly 1% of the purchase price of your equipment)...

  14. #14
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    $36/month. Not as harsh as I was expecting.
    Less than 1%, as the machine is $45,000 USD, and the power would cost $426 CAD.

  15. #15
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    If it's mission critical you'd obviously need to look at backup systems etc.

  16. #16
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    Of course.

  17. #17
    What type of $$$ Expensive machine u talking about lol...

  18. #18
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    A really big wireless access point.

  19. #19
    Oh really lol...

  20. #20
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    43dBm. 625x more powerful than your standard wi-fi card.

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