If I've convinced you to add one or possibly two motors to your boat, Barry Stegall, product manager for Motorguide, maker of Great White saltwater electric trolling motors, suggests you buy the most powerful motor that you can afford. If possible, it should be a 36-volt model. Here's why: A 12-volt electric motor uses 1.2 amps per pound of thrust, a 24-volt uses .9 and a 36-volt uses .55. The 36-volt system is more than twice as efficient as the 12-volt. You'll go much, much longer between battery charges.
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