Electrical costs to run a home web server

[techlists at phpcoderusa.com]

Hi Eric,

I assume you live in the valley? And you use a master cool evaporative 
cooler... Off topic question - Does your master cool, cool your house 
reasonably in the summer and more so during the monsoons?


On 2021-07-21 15:50, Eric Oyen via PLUG-discuss wrote:
> Back when I ran a home server on my Athlon X2 with 1500 W supply, the
> machine never drew that much. Even with several disks spinning, 8
> VMWare instances going and a few other goodies, that machine never
> drew more than 600w at maximum. I kept it live 24/7 for a few years
> and it added less than $120 yearly to the electrical bill. These days,
> that machine is out of service and is only good for parts. My Mac
> mini, which draws at most 100 W under full load is on 24/7 and I don’t
> even see it add that much to the electrical bill here. There are
> really only 3 high draw appliances in this house now:
> 1. The refrigerator
> 2. The stove/oven
> 3. The master cool evaporative cooler. Everything else either runs on
> wall warts or only gets used occasionally. In fact, we spend less than
> $150 a month here for electric. Now, if I put that Athlon X2 back into
> service, we might see $10 a month in extra use. I am still
> contemplating putting it back up and using it as my go to linux
> development machine.
> 
> -Eric
> From the Central Offices of the Technomage Guild, Utilities Dept.
> 
>> On Jul 21, 2021, at 7:33 AM, Keith Smith via PLUG-discuss 
>> <plug-discuss at 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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