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Go Back   Blu-ray Forum > Home Theater > Home Theater General Discussion > Car Audio and Video


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Old 10-27-2009, 01:28 PM   #1
miltonhork miltonhork is offline
Banned
 
Oct 2009
United Kingdom Determine Your Ampere's Pull


Hi to all,


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

Now

I = amperes
Po=RMS
n=efficiency
V=voltage


So for me its:

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

So I do this

3000*.8 and i get 2400


3000-2400=600

600+3000

3600/13.8

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!
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Old 11-22-2009, 06:56 AM   #2
Jbald87 Jbald87 is offline
Active Member
 
Jan 2009
South Western, Michigan
47
Default

Quote:
I = amperes
Po=RMS
n=efficiency
V=voltage

So for me its:

I = (3000 - .8*3000 + 3000) / 13.8
I donno about your car but most vehicals these days run at about 14-16 volts at ideal.

But if you are pulling 3000 watts rms that looks like a fitting amount of amps. I dont know what amp you have to tell you how things are running. IE how many watts RMS you are pulling at what ohms it's set to.
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