RE: [DML] Re: Car's use of electricty / alternator & battery question
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RE: [DML] Re: Car's use of electricty / alternator & battery question

I'm probably the only person in the world that rates the alternators hot
instead of what we call bench cold. I put them under a 100 amp load and
start the spin at 5000 RPM shaft which is about 2500 engine. Let it turn
till it starts to heat up and I can watch the current drop. Once it begins
to stabilize with no wind blowing over it to cool it off then I pronounce it
the rating, Like D110 or D140.  So it's rated hot not cold which is a true
rating of it's working value.
John Hervey

-----Original Message-----
From:David Teitelbaum
Subject: [DML] Re: Car's use of electricty / alternator & battery question

The Ducey alternators seemed to be a lot more sensitive to high temps
than the others.... To properly rate an alternator at max output you
have to figure the temperature it will operate at. It is not playing
fair to bench an alternator at 70 degrees to it's full output for 5

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