300a alternator?

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twobig86

Copper - Posts: 84

Joined: November 30, 2005

Posted: September 24, 2008 at 3:13 PM / IP Logged

Does running my new 300 Amp alternator harder on the engine than say a stock 70 amp one? Some people I know are saying that it is going to take around 5 hp just to run it...im kind of confused about all this...

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: September 24, 2008 at 3:20 PM / IP Logged

It takes power to make power, so yes, a larger alternator can place a larger load on your engine. 300a @ 14.4VDC = 4320 watts, which is equivalent to about 5.8 Hp. It will lower your gas mileage too (of course the worst gas mileage destroyer in car stereo can be the added weight of large subwoofer systems.)

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twobig86

Copper - Posts: 84

Joined: November 30, 2005

Posted: September 24, 2008 at 4:59 PM / IP Logged

So what about if its at idle say 100 amps? Would it be using roughly 2 hp or would it always be using the 5.8 hp...

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: September 24, 2008 at 5:04 PM / IP Logged

The power required by anything electrical, including alternators or amplifiers or anything else, is determined by the load So yes, if it's producing 100 amps it needs a lot less power input than if it's producing 300 amps.

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300a alternator?

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