Current Draw and Alternator Size

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=51513
Printed Date: July 04, 2025 at 9:10 PM

Topic: Current Draw and Alternator Size

Posted By: evanc
Subject: Current Draw and Alternator Size
Date Posted: March 08, 2005 at 7:35 AM

I will be running the JBL 1200.1 (1200~1400 watts x1 @1 ohm), the JBL 80.2 (45 watts x2 @2 ohm) and the Phoenix Gold Ti600.2 (150 watts x2 @4 ohm) in a '97 Ford Explorer (4L V6 SOHC Engine). I figured that setup would pull somewhere in the neighborhood of 160 amps of current, please correct me if I am wrong. Would a 200 amp alternator suffice for this, or do I need to go larger.

Right now I have been able to find a 200 amp alternator for $235. If anyone can find anythign better, or bigger (if needed) please let me know.

Thanks,
Evan

Replies:

Posted By: Master Asylum
Date Posted: March 08, 2005 at 8:57 AM

Theoretically something like 70 amps for every 1000 watts of power is a good measure. Assuming that is fairly accurate you should be fine. (Given anything that requires a good amount of power might slightly strain the system, it shouldn't last long enough to be a deal.) IMO the 200 should be fine assuming the rest of your accessories aren't pulling more than 40-50.

-------------
1998 Monte Carlo w/
Eclipse CD8454
2xRockford 5.25" Power 2-way T152C
2xRockford 6"x9" Punch 3-way FRC4369
1xMemphis 16-MCH1300 5-channel
2xKicker 12" L5 Solobaric-2 Ohm

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