Alternator question

[Mrsoto126]

I am running 3 amps in my car and they all add up to 3000watts. Now I want to upgrade my alternator but not sure how much amps I should be getting. Can anyone explain how to figure this out?

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[caraudio93 10+ year member]

Figure out what voltage your car idles at, whether its 13.8 or 14.4 volts, and divide 3000/14.4 and that gives you your amperage. Watts = Volts x Amps... So supposing that your car idles at 14.4, 3000/14.4 = 208, So you would need a 200amp alternator to run your system... However, you could probably be fine with a lower amperage alternator and a couple extra batteries. Hope this helps

 

[Mr. Bombastic 10+ year member]

200+ anything less will not be worth the money you are investing in said alt..