Oasis Trolling Motor Size

What's a good trolling motor size for trolling on a 75# tandem kayak loaded with 2 passengers & fishing gear? What would be a good battery size that would last at least 2 - 3 hours of continuous use at trolling speed? This is for a Hobie Oasis & I'd like to eventually modify the motor to fit where the mirage drive goes.

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Take a looked at the Hobie eVolve motor or another place to look is bassyaks.com.