[K12OSN] OT: cost of operating one pc per year

[Doug Simpson]

Let me fill in a few misunderstandings here. . .


Doug Simpson
Technology Specialist
De Queen Public Schools
De Queen, AR
simpsond at leopards.k12.ar.us
"A Dollar Saved is a Dollar Earned"


>>> Barry R Cisna <brcisna at eazylivin.net> 10/13/2008 8:47 AM >>>
Hello List,

This is kind of off the wall but has anyone on this list ever had to
figure ( maybe for a tech plan?) what the cost is to run your schools
available pc's for the length of the school year? I'm not enough into
bean counting but I've always wondered what it would be. I always hear
the argument it's better to just leave the pc powered on versus turning
off at night as well.I'm sure it would be pretty tough to get anywhere

If you are figuring power savings, turn them off. If you are figuring longevity, turn them off.

I did a study last school year and found out that if our computers are left on 24/7, opposed to shutting them down at the end of school, we could *save* over $100,000 per year on the power bill. We don't buy $100,000 worth of computers every year on average. 

an accurate figure seeings how there probably wouldn't be two power
supplies using the same wattage.The reason asking I would think if you
figured 500 fat's with 450 watt power supplies versus 500 ebox's with 15
watts by the end of the year I would guess the $$ would be significant.

When talking about computers with 300 Watt power supplies or 500 Watt power supplies, that isn't necessarily the amount of power that the computer will use from the power company. That rating is the wattage that the power supply is capable of delivering to the components in the computer. If you have a computer that has a 300W power supply in it, the computer may only use 125 watts of it. If you put a 500W power supply in it, it will still only use about 125 watts. Likely a little more because there is an efficiency curve in there. . . a 500W power supply will be happiest at about 75% of it's rated value, or about 375 Watts. Any less than that and it gets less efficient and the draw from the power company gets higher for the delivered watts to the components.
When talking about thin clients, a fat with a 300W power supply, drawing about 125 watts against a thin client drawing about 15 watts, the choice is clear as far as power consumption. 

I would guess monitors versus lcd's would be just as big a factor as the
pc itself as well.  
As much waist as there is in school spending I guess it probably
shouldn't be any concern anyway? The amount of paper waist at our school
in $$ in one years time, I could probably buy my own little island in
the middle of the  nowhere and live:)...
I'm probably all wet though...

Take Care,
Barry Cisna

Ya'll have a great day!


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