You realize of course that you will require far less power pushing the outrigger than the main hull, right?
Any particular reason to go with the proa instead of a double outrigger banka boat type setup? A single motor, controller, bank, and solar array for just the main hull would give you more power for the dollar. I am all about going cheap. I think a single large 36v trolling motor (rated) and a 48v bank with an external PWM motor controller (the Chinese ones are very cheap) would push you along fairly well. Have a look at the Filipino Banka boats, (google that) and you might get some ideas. And the T105 is a great battery, but before you buy, ask yourself whether the presumably inferior Energizers from Sams Club at a much much lower price would be better for this project. I have a bank of 8 in series and I plan to add another 8 of them when I get home in Feb, which should reflect the high regard I have for them. The original ones are 3yo and are holding up well. These GC2 batts are a similar size, weight, and capacity to the T105s.
Search for the trolling motor prop discussions on this and other boards, too. The stock prop of a trolling motor leaves something to be desired once you start using the motor for other than its designed use. These motors were designed to efficiently push a bass boat size vessel slowly and quietly, not to serve as main propulsion of a smaller more canoe shaped hull. A larger prop with a bit more pitch is generally agreed to do a better job.
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