Determining Amperes Pull? (Help???)
#1
Determining Amperes Pull? (Help???)
This mainly pertains to the high end stereo guys here.
I am trying to figure out how much pull on my alternator I am getting from the amp.
And I beleive it's this formula
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 Im 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!!!!!
I am trying to figure out how much pull on my alternator I am getting from the amp.
And I beleive it's this formula
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 Im 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!!!!!
#2
RE: Determining Amperes Pull? (Help???)
brilliant conclusion!!!! now i just gotta figure out my #'s for my stereo
#3
RE: Determining Amperes Pull? (Help???)
Forgot to add.
Most class D amplifiers have an 80% efficiency rating!
Class A/B amplifiers usually carry a 60-70% efficiency rating
Most class D amplifiers have an 80% efficiency rating!
Class A/B amplifiers usually carry a 60-70% efficiency rating
#4
RE: Determining Amperes Pull? (Help???)
that sounds about right to me. on a side note, you may want to hit up a 270-300 amp alt in the near future. then you could bang fully eveywere you go and no worry of battery loss.
#5
RE: Determining Amperes Pull? (Help???)
so is it a problem when my numbers look like this????
1.2*5000=6000
6000/14.4=416.67???
1.2*5000=6000
6000/14.4=416.67???
#6
RE: Determining Amperes Pull? (Help???)
you'all need more amps. here is what mine are going to be:
if using sidewinders:
(7500-.8*7500+7500)/14.4 = 416.7
If using Napalms:
(13500-.8*13500+13500)/14.4 = 1125
if using sidewinders:
(7500-.8*7500+7500)/14.4 = 416.7
If using Napalms:
(13500-.8*13500+13500)/14.4 = 1125
#7
RE: Determining Amperes Pull? (Help???)
ORIGINAL: boomtruck97
you'all need more amps. here is what mine are going to be:
if using sidewinders:
(7500-.8*7500+7500)/14.4 = 416.7
you'all need more amps. here is what mine are going to be:
if using sidewinders:
(7500-.8*7500+7500)/14.4 = 416.7
I'm gonna do this out to refresh my memory and all so i dotn forget this
.8*7500=6000
7500-6000=1500
1500+7500= 9000
9000/14.4=625............
I had to have done something wrong here..............
Pat josh can u go over my math there and tell me where i went wrong?
#8
RE: Determining Amperes Pull? (Help???)
no, your good dude, i screwed that one up. you math was right on!
#9
RE: Determining Amperes Pull? (Help???)
gotcha i was like AW CRAP! thought i forgot how to do all this overnight lol
#10
RE: Determining Amperes Pull? (Help???)
ORIGINAL: hillbillyinOhio
so is it a problem when my numbers look like this????
1.2*5000=6000
6000/14.4=416.67???
so is it a problem when my numbers look like this????
1.2*5000=6000
6000/14.4=416.67???