Rodster, your're right about eh RMS watts. The 12volt.com is largely audio/security system buffs and most of the discussion seems to be with speaker systems.
But the gauge-amperage chart is good.
In my online research, I've seen umpteen references to the divide by 10 (or 12 depending on who you talk to) and add 50% for peak/spike demands at device startup as the "formula" for miscellaneous DC accessory wiring. This is pretty close to their RMS-amp table, but not exactly.
I take the approach, error on the side of the heavier gauge if you can bear the cost. It's safer.
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'03 pewter base H2
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