View Full Version : High Output Alternator question.

01-21-2012, 10:21 PM
Hello everyone, Well I am new to this site I was referred by a friend. I'm currently in the process updating my music system from what I have now. I would like to know how is the amperage calculated when buying a High output amp. I did use the search box but i felt that it wasn't much of help. I hope someone can help me how would I know how many amps on a High output altentor I would need.

My System set up is as follows:
2 10" Electro Voice Mid Woofers on the deck/ Lanzar Opti 800.2watt
2 6 1/2 Beyma Loudspeakers in the door. Hifonics 600.4 watts
2 Selenium Tweeters
1 12" Kicker L7 / Alpine mrp-m1000.1

I have a yellow top and also big 3 with Zero gauge.

01-21-2012, 10:25 PM
Buy the biggest you can afford. Gives you room to grow later.

01-21-2012, 10:27 PM
the build never ends.... so go big or go home, in the end it will save you money

Bettr n' Revrse
01-21-2012, 10:55 PM
Wrong section...

01-22-2012, 03:08 PM
Take the RMS you plan to run and divide it by the efficiency of the ohm load the amp will be running at. For instance, 1,000 rms. Lets say you run an amp at 2 Ω and the amp is 80% @ 2 Ω. 1000/0.80 = 1250. Then divide that by the charging voltage you're electrical is running at, say 14.4 volts. 1250/14.4 = 86.8. So running the 1,000 rms @ 2 Ω at maximum output (full tilt) you could expect to be pulling ~87 amps from your electrical.