nanog mailing list archives

Re: DC power versus AC power


From: "Stephen Sprunk" <ssprunk () cisco com>
Date: Sun, 29 Dec 2002 21:16:39 -0600


Thus spake "Wayne Bogan" <wbogan () InfoAve Net>

For those AC only powered units, you can also purchase an invertor for DC
to
AC conversion.  You would then have the advantages of DC for your AC
equipment.  This does, however, add the potential of another point of
failure such as fuses or breakers in the invertor.

Well, that's how AC UPS's work -- just beware what percentage of the input
current is lost in the conversion from DC to AC, plus what is lost
converting from AC back to DC inside the equipment.  Much simpler to specify
DC equipment to begin with if you really care about availability.

S


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