My SRP bill is $293.65 and we run our AC hard, have fans going, and my
wife leaves the blinds open all the time so I know we could save money
there too. I am running a 24core ThreadRipper, 4bay NAS, 1 POE router, 1
non-POE router, HAM radio, laser printer, and 4 raspberry PI in a
cluster with 2 running pi-hole plus an entertainment NUC in the front.
Our bill goes down a lot in winter. I pay about $75 per month from Jan -
May and then in June it ramps up hard and then goes back down again.

I don't know the figures but I doubt that a 250W desktop costs $22 per
month in electricity. But if you are REALLY worried about it, switch to
a raspberry pi or beaglebone cluster over POE. If your workload is
capable of taking advantage of parallel processing, it would probably
save time and money (and look cool which is what really matters right...?)

If you need to be exact, you can buy a device that measures at the plug
and you can monitor your computer to get exact figures.

On 7/21/21 7:33 AM, Keith Smith via PLUG-discuss 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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