On 2/29/2012 7:45 AM, Edward Ned Harvey wrote:
From: [email protected] [mailto:[email protected]]
Sent: Tuesday, February 28, 2012 6:06 PM
currently you take the DC input (solar), run it through an inverter to
feed it to a UPS, to convert it to DC (to charge the batteries), to
convert back to AC to run to the power supply in the PC to convert back to
various DC levels to use inside the machine.
While AC->DC converters are ~90% efficient, DC -> AC inverters are less
so, topping out around 70-80% efficiency.
It seems like it should be possible to do a lot better.
I know a hermit, a masters of EE, who lives in the woods in NH. He lives so
far out in the woods, he couldn't get the electric company to install a
power line. But he got the phone company to install a phone line. So he
uses the phone line to charge batteries, and he runs almost exclusively 12V
DC appliances (which are easy to obtain, thanks to mobile America... As in
RV's... *sigh* I guess the term has changed now...) Anyway, long story
short, yes it's absolutely possible to feed things with DC, and do it
efficiently.
Yes it is, but again one should take heed that range and voltage are
severe taskmasters. Low voltage at short range is fine. low voltage at
long range (i.e. from an electrical room to a server rack) is costly.
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