RE: (ET) AllTrax -- Thinking Out Loud

["Markus Lorch" <mlorch vt edu>]

The automotive industry is switching to 42V (3*14V) for future
cars to accommodate higher power accessories. I assume this will
mean 36V battery and 42V with running engine. (similar to 12V vs. 14V)

I think the Toyota crown royal is the first of this new breed of 
cars and the 42V PowerNet will probably make it in other cars over
the next view years. Anyhow, the point is that 36/42V components may
become much cheaper and readily available in say 5 years or so.

Markus

> -----Original Message-----
> From: elec-trak-bounces cosmos phy tufts edu 
> [mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of Jim Coate
> Sent: Friday, May 14, 2004 12:48 AM
> To: Elec-Trak
> Subject: Re: (ET) AllTrax -- Thinking Out Loud
> 
> 
> I wouldn't switch the system voltage. If you go to 24 volts, 
> every thing 
> will just seem wimpy as it would not have as much power/speed 
> as it does 
> now. If you go to 48 volts, the drive motor should do fine and get 
> higher top speeds. But the mower deck uses permanent magnet 
> motors which 
> won't like the higher voltage and probably have a short life span. So 
> you would need to add a second controller for the mower deck. 
> The snow 
> thrower and tiller use series motors (like the drive motor) so would 
> probably be ok with the higher voltage, but running at a higher speed 
> might give weird results (high speed tiller??) so would also need 
> controllers.
> 
> There are plenty of smart 36 volt chargers out there if you 
> you are in 
> need of a replacement. If money isn't an issue you could get a nice 
> three-bank charger and charge in 3 groups of 2 batteries which would 
> keep everything super well balanced. Or just get a cheap used 
> golf cart 
> charger.
> 
> 
> tjwilhelm wrote:
> > 
> >     * There are so many nice 24VDC or 48VDC battery chargers and
> >       inverters available, it might be nice to operate the 
> Elec-Trak on
> >       either 24VDC or 48V instead of 36V.
> 
> 
> 
> _________
> Jim Coate
> 1970's Elec-Trak
> 1992 Chevy S-10 BEV
> 1997 Chevy S-10 NGV
> http://www.eeevee.com
> 
> 
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