Fan Question

Discussion in 'General Chat' started by Crazy Snake Man, Aug 3, 2006.

  1. Crazy Snake Man

    Crazy Snake Man
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    Hi, sorry for being a pain and maybe asking a stupid question.

    My aunt is having trouble sleeping in this heat, its ok at moment but with another heatwave expected. She wants to move her free standing fan into the bedroom but has a couple of questions that I can't answer relating to health and safety and cost (as elec is so exp now)

    questions are below and any response would be very much appreciated.

    1. is it ok to run for 7-8 hours at a time?
    2. what is approx units used per hour (on lowest setting)
    3. what is approx cost of a unit per hour

    thanks!!!
     
  2. Downinja

    Downinja
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    1. Shouldn't be a problem
    2. Depends on size & model
    3. Depends on size & model
     
  3. GW43

    GW43
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    The fan on my desk at the moment is rated at 40W. It would therefore consume 1 KWH (kilowatt hour) every 25 hours (say 3 days in the example you quoted).

    I can't remember how much a KWH costs (around 12p?*), so a fan the same size as mine (12" diameter) would cost about 4p per night - or 1/3 of a KWH, depending on how much that costs.

    * Be gentle with me if I've got that wildly wrong - I don't check my bills that closely!
     
  4. Crazy Snake Man

    Crazy Snake Man
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    thanks, if you dont mind i will try and post size and power if can find from her fan, or if she has the box.
     
  5. Nick_UK

    Nick_UK
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    Maplins sell a little gadget that measures the power consumption of any device you plug into it. L61AQ - price £12.49.
     
  6. IronGiant

    IronGiant
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    It should be on the base of the fan, and don't forget this will be its power consumption on full speed. I've got one of those do-das Nick, I'll see what my fan is on minimum.
     
  7. Crazy Snake Man

    Crazy Snake Man
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    thanks you guys are amazing! think she was worried it could easily be a few pounds each night.
     
  8. Nick_UK

    Nick_UK
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    Just plugged my 12" fan into the Maplins box and the wattage was as follows:

    Low - 28W
    Med - 33W
    High - 37W
     
  9. IronGiant

    IronGiant
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    Update:

    My fan is rated at 50 watts. It surges to 55W on switch on at speed 3 for a few seconds as it gets up to speed then runs at 52W, speed 2 is 45W and speed 1 42W.

    Dave

    Edit:
    Beat me to the draw Nick!! :thumbsup:
     
  10. Nick_UK

    Nick_UK
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    I was quite surprised to see how little difference there was between the high and low settings.
     
  11. DJT75

    DJT75
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    My fan's been on me all night for the past month, glad to hear it's not costing me the earth........:thumbsup:
     
  12. Dynaudio Desire

    Dynaudio Desire
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    My fan is rated at 140 watts. I only use it on setting 1 though.
     
  13. Nick_UK

    Nick_UK
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    What make is it ? "Wind Tunnel" ? :D
     
  14. Crazy Snake Man

    Crazy Snake Man
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    great news isnt it, im quite surprised that it could be as low as a few pennies a night! :clap:

    thanks again everyone.
     
  15. IronGiant

    IronGiant
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    Yes me too, I assumed there would be some inefficiency in running at a lower speed, but nothing like that. I would guess on full mine is shifting 3 or 4 times more air but is only using 20% more electricity compared to low.
     
  16. Carl Stock

    Carl Stock
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    Fans are pretty efficient in terms of the amount of electricity they consume. Ceiling fans, too, are good in terms of efficiency. It is our amplifiers that we need to worry about!!! :devil: However, many of these new digital amplifiers in small systems use something like 40W to 70W! Amazing!

    Leaving a fan on nearly all the time should do no harm either. You may want to give it a little rest (i.e. first thing in the morning) for while if at all worried.

    Also, I remember reading that many motors work most efficiently when running at maximum speed, which also applies to appliances like washing machines when spinning, etc. (i.e. maximum efficieny is obtained when running at full power). I may be wrong, but I think that is what I read! :)

    So, everyone, it may be best to stick the fans on full power! :D
     

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