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Generally speaking, if you are drawing less than 1/2 to 2/3 of your alternators rated output, you're probably OK, a cap might be benificial. At 1 to 1.5 times rated output, a 2nd battery is a good idea. Anything above 1.5x, and it's probably necessary. More than 2x rated output, and you should seriously consider upgrading the alternator.
To get your current draw, just add up all the fuse ratings for your amps. Not all amps will draw full power, but we're trying to make this simple, so the preceding makes a good general rule, assuming that some of the amps will not draw max current. If all your amps are running bridged to subs, or are amps that always run full power (the JL amps are the only ones that di this now), assume you're more likely to need an upgrade.
Hope that helped!
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