How long does it take to recharge a car battery with a wind turbine?

Question by Coris Airport: How lengthy does it take to recharge a automobile battery with a wind turbine?
I'm preparing to develop a catamaran from two surfboards, attach a DC pump motor, put a seat on it and a wind turbine (500W) and make this factor my commuter boat. It wants to cover 8 miles in under an hour and back, and I hope to recharge it over night utilizing the wind turbine only (the thing will be moored in Otago Harbour, southern New Zealand, and I'm planning to swim out to it in the

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