|The table below gives the details for power saving on our two PC's.
The total saving is a rather astonishing 1780 KWH per year. This results in a saving of $178 in electricity costs and nearly 3600 lbs of CO2 emissions.
The current operating mode is as follows:
I don't know of any other way to save this much electricity so easily.
One of the key things to realize is that the PC peripherals (printers, scanner, speakers, router, ...) use quite a bit of power. As you can see from the table below, our peripherals use more power than the PC itself. This means that its not enough to just set your PC to go into standby or hibernate -- this still leaves all your peripherals sucking power.
Table showing power consumption in the various modes as measured with a Kill-A-Watt meter:
|Item||Downstairs Office||Upstairs Office|
|On Steady||Hibernate||Off Mode||On Steady||Hibernate||Off Mode|
|Phone + Intercom||2||2||0|
|Measured Totals||174||54||0||100 to 128||10||0|
"On Steady" Mode means the steady state power consumption after all initial startups are done -- for printer it is NOT during printing
"Hibernate" Mode means that PC is placed in hibernate, and all other things are whatever they go into when PC hibernates (e.g. LCD's consumption drops a lot)
"Off" Mode means zero consumption (power strip turned off)
1 -- the LCD monitors use about 26 watts when displaying a picture, but go down less than a watt when the computer goes into hibernate.
Power Strip Saving --
Assume 10 hrs per night with no power use --
Savings = (10 hr/night)(365nights/yr) (Steady On Power)/1000 = 1084 KWH per year
Hibernate Saving --
Assume 8 hrs per day of hibernate power use --
Savings = (8hr/day)(365 days/yr) (Steady Power - Hibernate Power)/.1000 = 695 KWH per year
Total Savings = 1084 + 695 = 1779 KWH per year !!!!
Gary 3/31/07, updated/clarified Nov 7, 2007