Article View: sci.energy
Article #2073Why not 120 VDC ? Why in
From: John Holmgren
Date: Tue, 26 Jan 1993 07:47
Date: Tue, 26 Jan 1993 07:47
24 lines
1672 bytes
1672 bytes
EM>Pondering this ... Why not just use a 120 VDC battery pack and use
EM>120 VDC for a bunch of stuff? Lightbulbs don't care if they are
EM>AC or DC, nor do electric stoves and ovens or other resistive heat
EM>sources. Some tools have AC/DC motors. 120 VDC was a common motor
EM>type not too long ago, so I'd expect some motors to be available
EM>for things like house fans.
Not a bad idea, but I think that there are several objections:
1- will still need some AC as well as DC since some tools require AC, and
it DOES make a difference to bulbs, in terms of life.
2-DC switches have arcing and sticking and contact burning problems.
3-Inverters are about 80-90 % efficient now. Also, by adding 12 VDC
circuits you can eliminate transformers in most transistor stuff.
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Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!Germany.EU.net!news.netmbx.de!mailgzrz.TU-Berlin.DE!math.fu-berlin.de!ira.uka.de!yale.edu!spool.mu.edu!howland.reston.ans.net!zaphod.mps.ohio-state.edu!swrinde!cs.utexas.edu!sdd.hp.com!decwrl!csus.edu!netcom.com!netcomsv!spacebbs!john.holmgren From: john.holmgren@spacebbs.com (John Holmgren) Newsgroups: sci.energy Subject: Why not 120 VDC ? Why in Message-ID: <5840.1017.uupcb@spacebbs.com> Date: 26 Jan 93 07:47:00 GMT Distribution: world Organization: SPACE BBS - Menlo Park, CA - 10 Lines + 4gB - 415-323-4193 Reply-To: john.holmgren@spacebbs.com (John Holmgren) Lines: 24