[Beowulf] power usage, Intel 5160 vs. AMD 2216
James.P.Lux at jpl.nasa.gov
Fri Jul 13 19:35:39 EDT 2007
At 02:19 PM 7/13/2007, you wrote:
>>(you could cobble one together cheaper.. a high quality charger is
>>probably $50-100, good quality battery is around $20, a high
>>quality inverter is $200 or so, and then you'd need some sort of
>wouldn't it be nice to find a PSU which could simply take a 12V input?
>battery->inverter->switchingPS->DCelectronics is kind of gross...
They're available..but expensive and pretty inefficient.
More efficient, but not much cheaper, are PSUs running off 48V (a
standard voltage for telecom installations).
Last time I checked, I think they were in the several hundred dollars range.
(just found a website for www.powerstream.com
for a 12V 300W supply, they say 65% efficiency
for 48V, they give 70% efficiency
James Lux, P.E.
Spacecraft Radio Frequency Subsystems Group
Flight Communications Systems Section
Jet Propulsion Laboratory, Mail Stop 161-213
4800 Oak Grove Drive
Pasadena CA 91109
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