Re: (ET) DC-DC Converters - Lot of 6

["Christopher Meier" <mr23 mn rr com>]

Yes, they do, but those are not the ones I was referring to.  Rod is out
this week, so it will have to keep for a while.  The person I spoke with
clearly didn't know about them.

BTW, the units they do have listed are non-adjustable, fixed somewhere
at 13.x volts.

----- Original Message -----
From: "Tim Clevenger" <tclevenger hotmail com>
To: <elec-trak cosmos phy tufts edu>
Sent: Thursday, March 28, 2002 2:32 PM
Subject: Re: (ET) DC-DC Converters - Lot of 6


>
> Evparts.com has 10 amp units (18-50VDC input) for $113.57 and 25 amp 
> units
> (20-60VDC input) for $214.35.
>
> http://store.evparts.com/_i.html
>
> Tim
>
>
> >From: "Christopher Meier" <mr23 mn rr com>
> >To: <pctrice purdue edu>, "David Roden \(Akron OH USA\)" <roden ald 
> >net>,
> >"'elec-trak cosmos5 phy tufts edu'" <elec-trak cosmos phy tufts edu>
> >CC: "Phil C Trice" <pctrice purdue edu>
> >Subject: Re: (ET) DC-DC Converters - Lot of 6
> >Date: Thu, 28 Mar 2002 02:09:56 -0600
> >
> >I think Bill Dube gave some compatible units to Rod Wilde to sell for
him.
> >I've been meaning to call them up and ask them.  I'll try to do so
Thursday
> >and report back if he has any left.
> >
> >-Chris
> >
> >----- Original Message -----
> >From: "Phil Trice" <pctrice purdue edu>
> >To: "David Roden (Akron OH USA)" <roden ald net>;
> >"'elec-trak cosmos5 phy tufts edu'" <elec-trak cosmos phy tufts edu>
> >Cc: "Phil C Trice" <pctrice purdue edu>
> >Sent: Wednesday, March 27, 2002 8:25 AM
> >Subject: RE: (ET) DC-DC Converters - Lot of 6
> >
> >
> > > David,
> > > (At the risk of lowering the signal/noise ratio :-), You raise some
very
> > > good points. I looked at the spec sheets for these yesterday, and 
> > > came
> >to
> > > the same conclusions.
> > > The point remains, though; are there any DC-DC convertors out there
that
> >are
> > > usable (ie, reasonable current capacity, size, etc) and affordable?
> >Barring
> > > that, are there known, stable designs that could be turned into 
> > > usable
> > > products?
> > >
> > > -Phil Trice
> > > 1976 Sears Electric tractor
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: owner-elec-trak cosmos phy tufts edu
> > > [mailto:owner-elec-trak cosmos phy tufts edu]On Behalf Of David Roden
> > > (Akron OH USA)
> > > Sent: Tuesday, March 26, 2002 2:32 PM
> > > To: 'elec-trak cosmos5 phy tufts edu'
> > > Subject: Re: (ET) DC-DC Converters - Lot of 6
> > >
> > >
> > > On 26 Mar 2002 at 12:57, Chapin, Tim wrote:
> > >
> > > > 6 dc-dc converters on ebay..
> > >
> > > Careful!  These are for 24 and 48 volt nominal input, so unless 
> > > you've
> > > upgraded your ET to 48 volts, they wouldn't help much (you'd still
have
> >to
> > > tap the pack).  The specs say "18 to 36 volts" for the 24 volt units,
> >but
> > > that's intended to leave "headroom" for higher voltage during
charging,
> >not
> > > for routine operation.
> > >
> > > If you tried to use the 48 volt units instead, you'd have problems.
They
> > > probably won't put out full current, and are more likely to overheat,
> >when
> > > run below nominal voltage.  Also, when you loaded the tractor and the
> >pack
> > > voltage sagged, they'd probably drop out.
> > >
> > > Finally, each is capable of delivering only 20 watts.  That's about 2
> >amps
> > > at 12 volts -- barely enough to run the headlights, if even that.  
> > > You
> >might
> > > be able to parallel all six and get 8-10 amps (DC:DC converters don't
> >share
> > > loads perfectly, so you probably wouldn't get 12 amps), but you'd
still
> >have
> > > the input voltage problem.
> > >
> > > These DC:DCs probably have some uses, but I wouldn't buy them for an
> >ET's
> > > lights and/or lift.
> > >
> > >
> > > David Roden - Akron, Ohio, USA
> > > 1991 Solectria Force 144vac
> > > 1991 Ford Escort Green/EV 128vdc
> > > 1970 GE Elec-trak E15 36vdc
> > > 1974 Avco New Idea 36vdc
> > > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
> > > Thou shalt not send me any thing which says unto thee, "send this to
all
> > > thou knowest."  Neither shalt thou send me any spam, lest I smite
thee.
> > > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
> > > Est. yearly US cost to safeguard Persian Gulf oil supply: $50 billion
> > > Est. 2001 value of US crude oil imports from Persian Gulf: $19 
> > > billion
> > >                                                           -- Harper's
> >Index,
> > > April 2002
> > > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
> > >
> > >
> >
>
>
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