Electrical costs to run a home web server

[Brian Cluff]

I think you'll find that server of yours used closer to $500 than $120.  
Based on the 600watt number that you gave your usage would look like 
this on SRP right now under their normal flat rate plan:
Months 	Number of Days 	Kwh Cost 	Machine Load in Kilo watts 	Cost per 
hour(KWH cost times wattage) 	Cost per day(Cost per hour time 24 hours) 
Total Cost (Cost per time period)
May, Jun, Sep, Oct 	122 	0.1091 	0.6 	0.06546 	1.57104 	191.66688
Jul,Aug 	62 	0.1157 	0.6 	0.06942 	1.66608 	103.29696
Nov, Dec, Jan, Feb, Mar, April 	182 	0.0782 	0.6 	0.04692 	1.12608 
204.94656

	
	
	
	
	Grand Total 	499.9104


Even if you machine used half the power you specified it would still be 
about twice what you thought it was.

I always recommend that people don't use their old computers when it 
comes to use cases like using them for routers  because it's MUCH 
cheaper to buy something like a PI or a dedicated router than it is pay 
for power to feel a machine that uses waaay more than you need to.
With a raspberry pi under worst case useage with it being use to 100% 
capacity you'd only get charged $6.32 per year, but it would most likely 
be closer to it's idling cost of $2.82 for power:
Months 	Number of Days 	Kwh Cost 	Machine Load in Kilo watts 	Cost per 
hour(KWH cost times wattage) 	Cost per day(Cost per hour time 24 hours) 
Total Cost (Cost per time period)
May, Jun, Sep, Oct 	122 	0.1091 	0.0076 	0.00082916 	0.01989984 	2.42778048
Jul,Aug 	62 	0.1157 	0.0076 	0.00087932 	0.02110368 	1.30842816
Nov, Dec, Jan, Feb, Mar, April 	182 	0.0782 	0.0076 	0.00059432 
0.01426368 	2.59598976

	
	
	
	
	Grand Total 	6.3321984



Brian Cluff

On 7/21/21 3:50 PM, 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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