Re: 120A alternator: hp drain

[Jake <maalouf@eng.buffalo.edu>]

I had the same question before, because i wanted to upgrade my alternator.

Use this formula:  P=IV, that is power = current * voltage
So we have P=what we want to find, I=120A-90A=30A, V=12V
30A*12V=360 Watts
Use a quick little conversion of 1hp=745.6998 watts and you get
approximately .482768 hp.  

So you lose about a 1/2 hp.  Well worth the amperage gains for a bumpin' 
stereo system, or whatever, IMHO.

Jake

'87 Scirocco 16V



On Wed, 24 May 2000, Scott Williams wrote:

> Guys, I'm interested in purchasing a 120A alternator for the Warpiggy.
> You know -mega watt rally driving lights and stuff. Anyway, will this
> heavier duty unit sap more horsepower than the 90A unit that I've got in
> there right now -sometimes/ always? When it is outputting the higher
> amperage it should eat up more power, but how about when it is at 90A or
> below? Or do these things go "full on" and off somehow?
> 
> Gee, I don't know the first thing about these things. Hrrrumph...
> --
> Scott F. Williams
> NJ Scirocco nut
> SCCA ProRally driver
> Hotrod Rabbit GTi
> 
> Check out our rally team's website!
> http://www.usrallyteam.com
> 
> 
> 
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