CAR AUDIO : Determine Your Ampere's Pull - Chevy Cobalt SS Forum : Chevrolet Cobalt SS Forums
LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 01-06-2010, 11:41 PM Thread Starter
Join Date: Jan 2010
Posts: 3
Exclamation CAR AUDIO : Determine Your Ampere's Pull

This is all Information I myself have gathered from the MECP Installers Guide book.

Alright Here's the Question!

I am trying to figure out how much pull on my alternator I am getting from the amp.

Here is the formula We use to figure this out

I = (Po - n*Po + Po) / V


I = amperes

So for me its:

I = (3000 - .8*3000 + 3000) / 13.8

So I do this

3000*.8 and i get 2400




260.87 This is my amperage draw correct?

and if I'm correct for everyone else heres an easier equation for this:

I = (2-n)Po/V

So for me this would go

1. 2-.8 =1.2

2. 1.2*3000=3600

3. 3600/13.8

And there we go. 260.87!!!!!

Now, We must remember that Most Class D Amplifiers have a 80% Efficiency Rating and Most Class A/B Amplifiers have a 60-70% efficiency Rating!
andrewan is offline  
Sponsored Links
post #2 of 2 (permalink) Old 01-07-2010, 11:59 AM
Contributing User
Join Date: Aug 2008
Posts: 401
How much can our alternators handle. I'm pretty sure I'm maxing mine out. I see my lights dim when I really crank the bass. Does not happen as often now that I have switched to mainly rock though.
SupremeSlacker27 is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Chevy Cobalt SS Forum : Chevrolet Cobalt SS Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
Lots of Car audio+Parts 2FST4U Parts Wanted/Parts for Sale 1 04-19-2007 08:14 AM
Car Audio For Sale sscobalt06 Parts Wanted/Parts for Sale 5 05-03-2006 01:46 PM
car audio parts for sale KangolRiot Parts Wanted/Parts for Sale 0 03-04-2006 09:04 PM
Random car audio equipment! [email protected]@K!!!! 06NosCobaltSS Parts Wanted/Parts for Sale 0 02-04-2006 02:00 PM
car audio/video its_hey_ma Parts Wanted/Parts for Sale 10 11-19-2005 12:44 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome