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PSU Affect on Energy Bill?

C

cwilhelm

Weaksauce
Joined
Mar 15, 2007
Messages
89
How much will a 750w PSU (comp. running near 24/7) affect my electricity bill?
 
It depends on the efficiency of the power supply as well as the load placed on it.
 
From a previous post of mine. A look at your power bill for the current rate and adjust the hours to your use if you like, the math is pretty easy to follow.


Lets assume the computer pulls 400W from the wall, a reasonable figure for a machine with a 750W supply. Lets add 100W for LCD monitor,amplified speakers, and misc crap and mainly to make the math easy call it 500W pulled from the wall to run the machine and its accessories.

Lets assume computer runs 4 hours weekday nights and 10 hours on Sat and 8 hours on Sunday and lets assume every month has 4 standard weeks. This is not correct but in general is a reasonable estimate of machine use. That is 38hours a week x 4 = 152 hours a month.

Watt-hours is 500w x152h = 76,000wh = 76Kwh

Above someone said power in Texas was .22 per Kwh, lets use .25 (ckeck your power bill or providers web site for your rate per Kwh

76 x .25 = $19 of power cost for a month.
 
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