-> I've thought about using marine parts, and I figure that the RPM
-> speed might be a bit lower on them (or do I have that backwards ?),
-> requiring less speed in order to produce the rated charging level.
Automotive alternators are generally overdriven by 2 to 3 times engine
Rpm. 700 engine rpms averages out to 1400-2100 Rpm at the alternator.
PLENTY of charge.
 ^..^
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