Well if you think about it, before you decided to run your computer 24/7
you probably have been running it about half that. Say 8-12 hours a day. So
your actual cost is most likely only half of what you calculated.



On Wed, Jul 21, 2021, 7:34 AM Keith Smith via PLUG-discuss <
plug-discuss@lists.phxlinux.org> wrote:

>
>
> Hi,
>
> I just read this quote about the electrical costs to run a web server
> from home:
>
> Cost: While it may sound cheaper to use that computer lying around doing
> nothing when creating your web server, when you factor in the cost of
> powering an old computer 24 hours a day, it can get very expensive. A
> 250W desktop computer running 24 hours per day at 12 cents per KW/h is a
> whopping $262.00 per year!
>
> ---
> I think their math is wrong.
>
> The average residential electricity rate in Chandler is 10.85¢/kWh.
>
> I'm thinking a low traffic PHP web server running on an old Dell with a
> 400 watt power supply is not using but maybe 100 watts on average.  I've
> read that the computer should use no more than half the power supply
> capacity.  Is this correct?
>
> If my home web server is using 100 watts an hour that mean 100 watts *
> 30 days * 24 hours or 72K watts.
>
> I'm thinking 72 * .1085 = $7.81 a month.
>
> Any thoughts are much appreciated.
>
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