Jeff, basically marine units have enclosed brushes/brush holders so thtere is no chance of spark and igniting gasoline fumes. In a Diesel appliction it doesn't matter but in a gasoline application you bet it does. If he is building something up for $240 it is almost garunteed to be a chinese clone and using cheap parts. Doesn't mean it wont work, but the chances of failure are greater. IT also might not perform as you expect. The problem is a lot/most people with huge stereo's sit with the boat off while playing the stereo loud. A big alternator doesn't do you much good at that point. Also, most of the aternators that are smaller and say they are 100+ amps have terrible low rpm output.
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