RE: Alternator Dynamics

["Aaron Ness" <aaron@makuta.com>]

Not sure about the others, but the wipers are fused at 8A.  I would expect
them to operate somewhere below that.  Is that right, or am I confused?

Aaron
'82 Scirocco
'84 Scirocco
'70 Bug - Hibernating
'87 Jeep Cherokee 4.0


> -----Original Message-----
> From: owner-scirocco-l@scirocco.org
> [mailto:owner-scirocco-l@scirocco.org]On Behalf Of Bill Collins
> Sent: Thursday, September 07, 2000 11:45 AM
> To: Scirocco LIST
> Subject: Re: Alternator Dynamics
>
>
> Here are some numbers that I came up with, you might want to
> modify them for your situation.  This is a worst case
> situation, like driving at night, in the rain, with the A/C
> on for defogging (not unusual here in the south!)
>
> Fuel pump      10A
> Radiator fan   20A
> Hi beam lights 10A (that's the number of a two lamp sealed
> beam system, the Scirocco's 4 lamp system or aftermarket
> system may pull more)
> Wipers          8A
> Rear window defogger 10A
> Misc (tail lights, ignition, etc) 10A
>
> Total: 68 amps! That's without a stereo, extra lights, etc.
>
> Bill
>
> ---------- Original Message ----------------------------------
> From: Mark Peele <type53@yahoo.com>
> Date: Thu, 7 Sep 2000 08:37:50 -0700 (PDT)
>
> >Here's a general question:
> >
> >My Sciroccos (all three) have 65A alternators. I have
> >removed the A/C from all three. I don't anticipate
> >having more than a 50W stereo. All cars will have
> >relayed headlights with H-4 main beams.
> >
> >Under what conditions would I really need a bigger
> >alternator (90a)?
> >
> >What is the advantage?
> >
> >Will a 90a alt. create more "drag" on the motor at any
> >given RPM than a 65a alt.? (assuming identical demand
> >from stereo, lights, etc.)
> >
> >TIA!
> >
> >--- Wing Gee <winggee@hotmail.com> wrote:
> >> Just curious then, why do people make such big
> >> altenators then if their only
> >> going to be drawing about 20 amps or so. aren't the
> >> corrados like 110a or
> >> something.
> >>
> >> ----- Original Message -----
> >> From: "Toby Reed" <toby@eskimo.com>
> >> To: "Wing Gee" <winggee@hotmail.com>
> >> Sent: Wednesday, September 06, 2000 1:36 PM
> >> Subject: Re: Math wiz's calculating hp.
> >>
> >>
> >> >
> >> > Wing, you got it. But remember the alternator is
> >> almost never making 65
> >> > amps of current, so the actual drain is a lot
> >> less. I'd say driving around
> >> > town, you're only drawing about 5 or 10 amps out
> >> of the alternator.
> >> > Headlights, stereo, fan blowing and things go up
> >> to 20 or 30 amps.
> >> > -Rarely- will you see the max capacity of your
> >> alternator....
> >> >
> >> > Mechanically the alternator gets harder to turn
> >> when its making more
> >> > current, so you're drawing a lot less HP than 1.21
> >> ! Probably closer to
> >> > one sixth of one horsepower.
> >> >
> >> > If you wanted to know more exact values, you could
> >> hook up an ammeter in
> >> > line with your alternator and get some data on the
> >> efficiency of the
> >> > alternator from the company that made it.
> >> >
> >> > -Toby
> >> >
> >> > On Wed, 6 Sep 2000, Wing Gee wrote:
> >> >
> >> > > For all you math people. See if i did this
> >> right. I'm converting power
> >> > > to hp. now i know P=I*V. Let me tell you what
> >> i'm doing first. I wanna
> >> > > see how much hp the altenator is dragging while
> >> it's charging. Now i
> >> > > know I=65a and V=~14v(it charges around there)
> >> Which is then multipled
> >> > > to get 910Watts=P. Now 1hp=746watts. now when i
> >> divide that. i get
> >> > > 1.22Hp. so my 65amp altenator is sucking up
> >> about 1.21Hp. To me that
> >> > > seems about right.
> >> > >
> >> > > Wing
> >> > >
> >> >
> >> >
> >>
> >> --
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> >>
> >
> >
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