help me decide which alternator

[kurtdirt1 10+ year member]

okay so i can get a 180 or a 200 for my car...the 180 does 120@idle and the 200 does about 80@idle...and at 2k rpm they reach their rated output...So which one should i get? the differences in price are about $40 so that's not the issue...the thing i'm stuck on is the output @ idle....I don't want to be @ a stoplight pounding away and have my voltage dropping badly. i'll be running about 3k so which one should i get? i'll have a few batteries as well.

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[PapaGeno21 10+ year member]

Personally, I would do the 120 at idle, only becuse even losing the 20 after the 2K rpm I would assume you would be fine. If you have a few batteries I would just leave it at that.