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Re: higher voltages (42v versus 12v)

 wrote:
> 
> i noticed a proposal to go from 12v to 42v:
> 
>    The Society of Automotive Engineers (SAE International) has published
>    42-Volt Systems: Technology Implications for the Automotive Industry
>    by Daniel J. Holt. The report examines the technological revolution
>    that will occur in automobiles as a result of the adoption of 42 volt
>    systems.

> and just like in aircraft (28 volts) it's for increased efficiency, etc..
> but there's always the question as to why a particular voltage is chosen,
> e.g. why not increase it even more...

It's interesting to note, 42 volts versus 48 volts.  Using 4 12V 
batteries in a row (48VDC nominal) will pop you over a "magical" 
number in the US electrical code that causes you to have to switch 
to high voltage wiring standards versus the low voltage standards 
currently in use in cars, etc..

42VDC is 7 6V batteries in series, and dosen't go over 50VDC while 
charging.

> we could go from 12 volts to 42, and then maybe from 42 to 96 volts
> (another popular voltage), or go to 120 volts dc (like the batteries on
> a solar car: often ten 12 volt batteries in series).
>

-- 
|  Bryan Andersen   |      |   http://softail.visi.com   |
| Buzzwords are like annoying little flies that deserve to be swatted. |
|   -Bryan Andersen                                                    |

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