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A 34 foot boat will not likely have a big enough engine to run two alternators. Both banks can be charged by one alternator with a battery combiner or isolator. A 100 amp alternator can take about 7 hp. A 34 ft boat might have a 30 hp engine in it, tops. In my opinion relying too much on electronics or electrical stuff is not a good way to go. I don't know if you have the boat yet but think it would not be wise to spend too much money on what might be termed peripherals. You have to remember that a big alternator is just the thin edge of the wedge. You'll have to upgrade your wiring too, then there's the combiner and regulator. I don't know what your budget is but hi output alternator, solar, wind, regulators, batteries etc. can run up to at least $6000. Depending on the boat it might not be advisable to put so much money in one area. Not trying to discourage you but much of this stuff adds little value to the boat on resale.
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Rick I
Toronto
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