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Re: Auto Power Environment
John_Calabrese@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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