method for determining min alt amps needed

[magic_wizard 10+ year member]

I plan on upgrading the alternator in my 2000 civic, but I have no clue how to determine the necessary amperage. I will be running at most 1600 watts total for a pair of sealed magnums and about 200 watts total for CDT classic comps. Will 200 amps be enough? If so, I will go ahead and get one from http://www.excessiveamperage.com

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