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# How Much Is This Pc Costing In Electricity?

2 replies to this topic

### #1 boopme

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Posted 28 October 2005 - 12:45 AM

The easiest way to determine your average price is to look at your monthly electricity bill, and divide the total charge by the usage (kWh).

For example, if your monthly charge is 37.88 and your usage for the month is 289 kWh, then your average price per kWh is 37.88/289 = .13 cents/kWh or the Rate. This happens to be the Rate in NE N.J.
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If you leave the PC on 365, 24/7 calculate like this

Cost ( annual) = Watts / 1000 x 8760 (hours in a year) x Rate. Use the wattage of the power supply

Example:
Cost = 400/1000 x 8760 x .13
= .4 x 8760 x .13
= 3504 x .13
= 455.52 per month 37.96
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Reduce the number of hours to 40 per week on the rest off.

Cost = .4 x 2080 x .13
= 832 x .13
= 108.16 per month 9.01
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Not 1000% accurate but quite close.

Enjoy
Pete

Edited by boopme, 28 October 2005 - 12:46 AM.

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### #2 jgweed

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Posted 28 October 2005 - 09:06 AM

Although your power supply maximum wattage is not always used by the computer, the calcutions provide a rough idea of cost. To this cost, however, you must add the electricity used by your monitor and, in some cases, any external speaker systems you have.
Regards,
John
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### #3 boopme

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Posted 28 October 2005 - 03:04 PM

Yes that is correct,the Pc is not always at full wattage. Generally less, The average in what I was reading is about 150W. There were calculations to account for different peripherals. The average monitor was 110w (ray tube) 75w (LCD) and a large range on speakers and memory. RAM is 10w per 128 MB. So for the sake of a general rule I used the high end or full wattage of the power supply to compensate. Most if not all users will spend less. In fact with power management, standby, idle and full times times differ also. After doing some of the other calculations I came out with numbers close but less than mine. Also with more and more users of XP and LCD monitors cost with these are less. So I perhaps should say your cost may be 20 - 40 % less. But I just was looking for some rule of thumb. The only rule of thumb I could find stated: "A 125 watt computer running 24 hours a day costs \$130 a year at a rate of 12 cents / kWh."