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Re: [K12OSN] Re: alternate power supplies



Huck wrote:

YEStation Mini(http://www.affirmative.net/extrathin.html#mini) cost $249 msrp...
at $0.07 per kWh(kilowatt hour) .. 8hrs a day(50 weeks a year) the cost of a 100-watts for that time period for 10 machines = $140
divide that by 10 for the Mini's...$14 a year...a savings of ??? $126... the mini pays for itself in energy savings in 2yrs.

Actually, it's a lot more than 2 years. You're using 10 mini's to figure the savings in electricity, but then only applying that to the cost of one mini when figuring the time it will take for them to pay off.


10 Mini's x $249 per Mini = $2490 / $126 savings per year = 19.76 years. Looks like his engineer was pretty close after all :)

So if the goal is saving electricity, these look great. Even if they don't live up to their full potential of using %10 of what a regular client uses, it will still be significantly less. However, if the goal is saving money, they don't appear to be worth it. It's very unlikely that the same clients would be used for 20 years. Computers (especially in a school environment) generally don't have that kind of lifespan :)

-Ben

--
=========================================
Ben Mabbott, bmabbott riverdale k12 or us
Riverdale Grade School
http://www.riverdale.k12.or.us
11733 SW Breyman Ave. Portland, OR 97219
Phone:(503)636-4511 Fax:(503)635-7534


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