Welcome to the forum, Toccota.
Back off a moment. One reason those impeller rigs are off the market may be that they slowed the
boats using them to an unacceptable degree. That "FREE ENERGY" ain't true. You will slow your
boat down by the energy created plus all the losses between
water and
battery, and it's happening while you are moving. With a
wind generator you can at least wait until you are anchored, and with
solar the loss is to the temperature of your
boat, not your water speed. With a small genset, you dodge all those problems at the cost of
fuel; you have the energy when you want it, not when the waves move and the
wind blows and the sun shines.
This may be a worthwhile
project, but the histories of threads on this forum would not suggest that it is likely. Good luck.
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