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post #1 of 16 (permalink) Old 12-14-2009, 01:45 AM Thread Starter
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HP to run alternator

Any of you smart electrical guys know how much power our alternators use at full charging capacity?

also how much amperage the IDM draws when we run our engines at WOT?

and last how many RPM's our alternators can turn?
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post #2 of 16 (permalink) Old 12-14-2009, 02:51 AM
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Re: HP to run alternator

The alternator is the least of your problems, Freeze Plug. About 2 HP, at least 20,000 RPM.

If only those who knew what they were talking about replied, this thread would still be on page one.
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post #3 of 16 (permalink) Old 12-14-2009, 03:18 AM
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Re: HP to run alternator

Could always change the pully size to keep it at a happy spot if there is one

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post #4 of 16 (permalink) Old 12-14-2009, 03:44 AM
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Re: HP to run alternator

Best setup Ive seen was an a/c clutch on an alternator. When the box was set at the line for launch the alternator kicked out and after the run it was engaged again. Worked flawless.

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post #5 of 16 (permalink) Old 12-14-2009, 04:55 AM
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Re: HP to run alternator

You planning on racing alternator outputs David?

Quote:
Originally Posted by crowz View Post
Best setup Ive seen was an a/c clutch on an alternator. When the box was set at the line for launch the alternator kicked out and after the run it was engaged again. Worked flawless.
Anymore info on this Crowz? Sounds pretty slick
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post #6 of 16 (permalink) Old 12-14-2009, 05:30 AM
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Re: HP to run alternator

watts= voltage*amps
1 hp= 745.7 watts

Watts = Volts * Amps (VA)

A 12 volt (nominal) alternator putting out 110 amperes creates 110a x 14.2v or 1562 watts.

One horsepower is equivalent to 746 watts. so for 1562 watts equvalent to 1562/746 = 2.1 horsepower.

You'll need a little more because of the alternator friction and resistance in the wire and other inefficiencies - so, for a horrible alternator running at 70% efficiency - 2.1/70% = 3.0 HP

I do not know the rpm for maximum output.

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post #7 of 16 (permalink) Old 12-14-2009, 05:32 AM
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Re: HP to run alternator

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Originally Posted by Powerstroked162 View Post
You planning on racing alternator outputs David?



Anymore info on this Crowz? Sounds pretty slick
Was done on a S10 race truck a friend of mine has. I mentioned it as a joke and a few weeks later he had one made up and running

I dont see him very much anymore as he works out of state a bunch but I'll ask him what he used when I see him again. From the looks of it he had welded the front nose off a gm a/c compressor on it and had the pulley running welded onto it. The arch bracket that tightens the belt was bent back to keep it in line and the end that bolts to the bracket was shortened.

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post #8 of 16 (permalink) Old 12-14-2009, 05:38 AM
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Re: HP to run alternator

thanks nigel

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post #9 of 16 (permalink) Old 12-14-2009, 05:44 AM
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Re: HP to run alternator

Why not look into some of the 16 volt batteries? Some are designed for total loss (no alternator) applications.

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post #10 of 16 (permalink) Old 12-14-2009, 01:44 PM
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Re: HP to run alternator

Quote:
Originally Posted by Powerstroke Racer View Post
Any of you smart electrical guys know how much power our alternators use at full charging capacity?

also how much amperage the IDM draws when we run our engines at WOT?

and last how many RPM's our alternators can turn?
I am also curious about the RPM's rating of alternators. Is it whatever the bearings are rated for?

On a class of Coast Guard boats that used alternators and inverters to supply power, we had a problem when high loads were applied for long periods of time the batteries would run down (boat at lower speeds). The DDEC system didn't behave well at low voltage.

We looked at different pulleys but the bearings speed ratings became an issue. We ended up with dual alternators and some fancy load sharing devices to solve the problem.

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