Laptop left on 24/7 = cost?

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  • HoriZon 18 May 2012 21:47:10 13,596 posts
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    I tend to leave my Dell laptop 17" screen on 24/7, when not in use the screen goes off and its only used for surfing and downloading really, the battery wont charge anyone so its plugged in all the time and just sat on the table, only reboot it a few times a month. It has a 90W AC adapter. Its not set to hibernate and the hard drives aren't set to spin down.

    What's the sort of weekly cost in 's would it be for leaving it on like this in electric terms?

    Edited by HoriZon at 21:50:54 18-05-2012

    I used to be a gamer like you, then I took an arrow in the knee.

  • grey_matters 18 May 2012 21:53:05 3,863 posts
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    Not much. If it is a new laptop very little indeed.
  • Inertia 18 May 2012 22:02:20 677 posts
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    Hardly anything if there is no battery charging, unless you have stuff charging through the USB, probably using less than 40-50W if screen is turned down or off. Impossible to say without checking though.

    Here is some internet info that might be useful from someone with the same question as you.


    I pulled out my Kill A Watt meter and tested my Dell 90 watt power supply and here's what I got:
    Computer plugged in, powered on, battery charging:
    85watts

    Computer plugged in, powered off, battery charging:
    52 to 59watts (varied)

    Computer plugged in, powered off, no battery installed:
    0watts (0.01amps)

    Computer plugged in, powered off, battery installed & fully charged:
    0watts (0.01amps) same numbers as if battery was not installed.
  • HoriZon 18 May 2012 22:04:05 13,596 posts
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    Its a 2008 model.

    Just interested to know how much the little bugger is costing me.

    I used to be a gamer like you, then I took an arrow in the knee.

  • heyyo 18 May 2012 22:06:14 14,369 posts
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    How much do you pay per kwh?
  • HoriZon 18 May 2012 22:15:56 13,596 posts
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    heyyo wrote:
    How much do you pay per kwh?
    Not sure logged in to check it but cant see it stated anywhere, I'm on BG Duel Fuel Standard though.


    hmm this might be it from the last bill:

    First 166 kWh x 23.552p
    Next 887 kWh x 10.809p

    Edited by HoriZon at 22:21:26 18-05-2012

    I used to be a gamer like you, then I took an arrow in the knee.

  • Deleted user 18 May 2012 22:23:50
    I've got an i5 2500k based system running 24/7 as my main machine/webserver/downloader, it's running OSX but if you enable all the modern powersaver setting it costs fuck all.

    Being mostly a mac user I tend to never turn my machines off, so with my windows computers I usually use s3 tool to make sure

    /has many 'puters
  • heyyo 18 May 2012 22:35:00 14,369 posts
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    HoriZon wrote:
    heyyo wrote:
    How much do you pay per kwh?
    Not sure logged in to check it but cant see it stated anywhere, I'm on BG Duel Fuel Standard though.


    hmm this might be it from the last bill:

    First 166 kWh x 23.552p
    Next 887 kWh x 10.809p
    90W for 1 hour = 0.09 kwh x 23.552p = 2p

    It won't cost more than 2p an hour to run, I think.

    175 a year at most..makes sense.

    Edited by heyyo at 22:42:43 18-05-2012
  • Inertia 18 May 2012 22:38:30 677 posts
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    Going from the guys figures on his 90W dell you probably use about 0.033 kWh so about 0.8 kW/day which makes 292 kW/year. How that straddles your first and next rates is hard to say.
  • Deleted user 18 May 2012 22:44:31
    Nice one Inertia, as a (mainly) mac user the idea of fully powering down a machine is alien to me, but Smith a modern Core Intel based rid there's no point, they yoouse minimal power even on the desktop and will sleep when needed.

    Drunk/
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