Question:

How many amps of alternator power are need to run this system?

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The system is an estimated 3200 watts rms with 5 amps and the fuses are 120, 120, 80, 80, and 50 totaling 450 amps. Assuming that the amps have an 80% efficiency use of power and you want to get 100% out of the amps.

The cars stock alternator is 105 amps and it is underpowered for the car to run at 100% it really needs a 120 amps.

What would be the total amount of alternator amps needed for this system to run at 100%.

My guess was 700 amps but I just figured from the fuses and put it together like this

120 amp fuse + 80 amp fuse = 200

Add in the 20% for efficiency and

144+86= 240 get a 250 amp alternator

120 amp fuse + 80 amp fuse = 200

Add in the 20% for efficiency and

144+86= 240 get a 250 amp alternator

105 amps for the car + 50 amp =155

Add in the 20% for efficiency and

126+60=186 get a 200 amp alternator

250 amp alt +250 amp alt +200 amp alt = 700 amps alt power

I know this is not scientific at all that’s why I’m asking this question because I don’t really know how to figure this out.

Oh yeah lets say 14.4 volts

And another thing would (whatever answer you give about the power) that prevent voltage drops?

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  1. There are a few things missing from your calculations.

    Here's a good calculator to figure all that out - http://www.box.net/shared/uchv4dbk88

    You'll need Microsoft Excel.

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