Monthly Power Consumption Calculator?

[Accipiter22]

Say I have a 400W PSU running at 80% effeciency, and I leave it on for an entire month, how would I calculate how much power it used?? Is there a calculator on the internet somewhere?

*I know I wouldn't be using the full 400W constantly, since that's only really at max load, but I'd like to know theoretically how much power I would be using maximum, that way I can take a percentage of that, and see how much it would cost to leave it on constantly.


I posted this in cases & cooling but I don't think it belongs there...

 

[Lonyo]

...Windows calculator.

 

[Accipiter22]

right but I don't know what the 400W portion means...is that how many watts per minute second or hour?? I tried per second, in which case I multiplied 400/.8......and then multiplied that by 60...for how much per minute, then 60 again for each hour, then 24 for each day, then 31 for each month, then multiplied that by the .118 my power company charges per KW used......and got that it would cost 158,025.60 to keep my computer on all month.....

 

[Engineer]

If you left your PC on and it was using 320Watts of the power supply, it would use .320KWh each hour. It would take 3 hours to use a KWh (approximately), or 8 KWh's per day. If your electrcity cost was $.06 (here in Lexington, KY) per KWh, it would be $0.48 per day (about $15.00 per month) to keep it on.

 

[ElFenix]

watts is a unit of power so it work divided by time. kilowatt-hours is not a unit of power but a unit of work.

anyway, you computer's peak consumption probably isn't above 200 watts from the wall.

 

[Lonyo]

400/1000/0.8 * 24 * 30 * 0.118
About $45

 

[Engineer]

Originally posted by: Lonyo
400/1000/0.8 * 24 * 30 * 0.118
About $45

Uh, the above equation = $27.19 (rounded), not $45.