Sailboat Electric Diagram How Powerful A Wind Turbine Do I Need To Recharge My Electric Boat?

How powerful a wind turbine do I need to recharge my electric boat? - sailboat electric diagram

I am building a catamaran electric two-seater, 21 feet long, about 8 knots, without candles, two DC motors. My goal in the range of about 20 miles before it needs recharging, and recharging of the device is a wind turbine. I saw the production of 100 to 400 watts when the marine species that are usually granted for ships, how long would it take to the turbine engines that power in my boat to replace Does anyone know? I'm hopeless with these things, but I love it.
Thank you very much!