Re: DC-DC?

[Royce Chow <rufus@infosite.com>]

> I was thinking the other night, when (notice I said when not if) major 
> manifactures begin to build mass quanitys of EVs, will DC-DC or AC 
> transformers be nesscary? My point is, will the accessorys still be 
> 12vdc or will they switch to the pack voltage. It seems more effecent, 
> both money and engery, to have all the accessorys to run at the pack 
> voltage. For instance, lets say a future EV has a 144 vdc pack, would  
> it be advantagous to have headlights and other accesorys to be 144vdc or 
> to step them down to 12vdc? Or would the wiring me a nightmare?
> Kyle Davis
> 
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Although it seems like a good idea, I doubt it would ever get standardized
because of the varieties of pack voltages. Also the risk of getting shocked
wold be scary. And most things would not like it when the voltage sags..
towards the end of the range the headlights would dim seriously under
acceleration.. I'm sure some things that are normally different from car to
car will change, like blower motors, but things that are standardized like
headlights are likely to stay 12v...  One thing that I think is very likely
is the exclusive use of LEDs for turn signals, parking lights, and brake
lights... heck, they're worth it just for reliability alone :)  I'm hoping
LEDs will bring back the beloved sequential turn signal :)

Royce Chow  KF6PEO
rufus@infosite.com