[Cialug] [omaha] Google Datacenters

[murraymckee at wellsfargo.com]

I was thinking that it would be really useful to have 12V power connections on my desktop and monitor so I could just hook up an extra car battery during power outages as a UPS.  Then when it got low you could just take it back out an hook it back up to the car to recharge it.  Unfortunately my laptop runs on 20V so I doubt it would work if I fed it 12V, and might never work again if I connected two in series and fed it 24V.

Murray McKee 
Operating Systems Engineer
WFFIS - Wells Fargo Financial Information Systems 
800 Walnut Street
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MurrayMcKee at WellsFargo.com 
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-----Original Message-----
From: cialug-bounces at cialug.org [mailto:cialug-bounces at cialug.org] On Behalf Of Daniel A. Ramaley
Sent: Friday, April 10, 2009 11:08 AM
To: Central Iowa Linux Users Group
Subject: Re: [Cialug] [omaha] Google Datacenters

Possible? Of course. Practical? I don't know.

You need very thick wires (thick inch-thick bars of metal) to carry 
enough current at 12V if the distance spaned is very far. If the wires 
are too thin, they will have too high a resistance and drop too much of 
the potential. If the wires are really too thin, they will get hot and 
melt. Making thick enough wires out of copper might be prohibitively 
expensive. Cheaper metals that don't conduct as well would require even 
thicker wires. Of course, if you have a room temperature superconductor 
(presumably made of unobtainium), then it might be more feasible. But i 
don't know much about superconductors; they might have limits on how 
much current they can carry too.

People with more electrical knowledge please correct me if necessary.

On 2009-04-10 at 10:49:09, jrnosee at gmail.com wrote:
>I've often wondered if it would be possible to convert AC to 12VDC for
> the entire datacenter then run 12V lines to each server and only have
> a DC->DC 12V/5V/3.3V Point of Load power supply do the conversion. 
> Thus eliminating power loss in the multiple AC-DC conversions and
> running all the extra power supply fans, etc.

------------------------------------------------------------------------
Dan Ramaley                            Dial Center 118, Drake University
Network Programmer/Analyst             2407 Carpenter Ave
+1 515 271-4540                        Des Moines IA 50311 USA
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