Alternator output needs chart

[DoobieBrother 10+ year member]

I'm looking for a chart that will show how much alternator is needed for how much amp. Basically I want to see how much wattage I can get away with given that I really don't want to upgrade alternator, add caps, etc.

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[DoobieBrother 10+ year member]

Ok. Just from the sound of that, I think I'm safe. The biggest amp I've considered so far was a Kicker 900.4 with a birth sheet of just over 1000. That's at 2ohms, though. I'd be running it at 4ohms, so putting 112.5 to each of front channels and like 450 with the other two bridged for my sub. So, it'd be a total of like around 680 running at 4ohms. I'll have to look up my alt output, but I believe it's like 145 or so. It's an `03 GMC Sierra.