Re: (ET) Batteries and lighting

["RJ Kanary" <rjkanary nauticom net>]

   Even if the battery does not  'mind '  it, most automotive computers 
will go to sleep at that voltage level, and the vehicle won't start.

----- Original Message ----- 
From: "Dave & Deb" <daveb drizzle com>
To: "Robert Adsett" <subscriptions aeolusdevelopment com>
Cc: <elec-trak cosmos phy tufts edu>
Sent: Saturday, March 12, 2005 11:37 PM
Subject: RE: (ET) Batteries and lighting


> Yeah I wondered about the "real life" meaning of this draw down test and
> tried to ask but there was a lot of folks and distraction going on.
> since Dave Cloud's focus is racing, drag and endurance, I would guess it
> has more meaning/application to him than it does to us with our etraks...
>
> However I don't think a car battery is ever meant to be drawn down to
> 10volts is it?
>
> Dave
>
> > At 07:30 AM 3/12/05 -0800, Dave & Deb wrote:
> > > Here's the battery dran down results I mentioned earlier.  I see I lied,
> > > just a little, about the car battery outperforming all the optimas but
> > > still it showed surprising capacity considering the number of cycles on
> > > it.
> > >
> > > Here are the results I recorded from our drain test demonstration last
> > > night:
> > >
> > > 41.2lb Orbital XCD34
> > > forty some seconds to 9.5V
> > > 0:44 to 9.5V @ 400A
> >
> > <snip>
> >
> > That's more of a test of cranking capacity than run capacity.  It's not
> > surprising the car battery showed well, that's the kind of use they are
> > optimized for.  Deep Discharge batteries are optimized for long runtimes
> > but at lower currents.  Optimized being a somewhat fuzzy term in this
> > case.
> >
> > 400A is a reasonably substantial battery load even for an industrial
> > forklift.  Peak motor (not battery currents) during acceleration can run
> > 600-1000A (it's been a while since I measured but battery draw would be
> > well below that) and during run the draw can drop to 30 to 75A depending
> > on
> > the vehicle.
> >
> > Robert
> >
> > " 'Freedom' has no meaning of itself.  There are always
> > restrictions,           http://www.aeolusdevelopment.com/
> > be they legal, genetic, or physical.  If you don't believe me, try
> > to
> > chew a radio signal. "
> >
> >                          Kelvin Throop, III
> >
> >
> > _______________________________________________
> > Elec-trak mailing list
> > Elec-trak cosmos phy tufts edu
> > https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
>
>
>
> _______________________________________________
> Elec-trak mailing list
> Elec-trak cosmos phy tufts edu
> https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak