Re: Auto Power Environment

[John_Calabrese@ENGELHARD.COM]

>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




John L. Calabrese
Research Engineer
Environmental Technologies Group
Engelhard Corporation


                                                                                            
                    "Andrew K.                                                              
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> though, is where they came up with the number 42? (Yes I know, it is the
> meaning of life :)

I thought it was the answer to the question... but nobody has figured out
the question yet. ;)

> systems.  I've heard that utility substations use 100VDC for some reason.
> but 42V?!

Actually, we use 120 VDC in our substations (but 48 VDC is found in our
older ones). Do that for the battery backup, in case the sub loses AC
power,
we can still control it through the large battery array. (my "real job"
deals with specialized control equipment found in substations, the
communications equipment, etc).

Telephone and paging system equipment uses -48 VDC. Wacky world we live in.

-Andrew

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