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Originally Posted by Alpine TSi
An easy way to determine if your alternator is safe is to add up your total amperage draw, if it exceeds 120% of your alternators output rating, you need a bigger alternator.
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Amp draw = watts / voltage.So, for example, 800 watt amp / 13.8 = 58 amps.And, unless you drive around at full volume with the amps' gain/sensitivity all the way up, take about 50%-75% of that, and you'll have somewhere in the ballpark of your average current draw.