Auto Power Environment

[Ludis Langens]

John_Calabrese at ENGELHARD.COM wrote:
> 
> >From what I hear, we use a 12VDC battery to supply a 14 VDC system
> (alternator charge).  The 42VDC is actually the alternator charge/ running
> voltage, but the batteries will be 36 VDC (12x3).  So we have a 36 VDC
> battery, supporting a 42VDC system.  as to why 3 times the standard now, I
> don't know but  IMHO I think it was a balance between safety, (arc
> strength), wire size, weight and electronic motor/component efficiencies at
> specific voltages

Part of the reason for "42VDC" is battery packaging.  You can build such
a lead acid battery as 3 rows of 6 (or 7?) cells.  That's a total of 18
(or 21) cells times 2.1 volts per cell.

I had heard of this as a 3x7 array - so the 42 volt battery is really
44.1 volts and the charging voltage remains below 50.

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/
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