John,
I assure you that if you do not match the prop to the motors performance curve, you will not make that motors power. I speak from experience. The first conversion I did was I took a 150hp outboard motor as the leg and put what was supposed to be a 70hp, (misrepresented by the seller), which really was a 10kw motor on it. Here's what happened. This was used on a 22ft pontoon boat which originally had that 150hp motor on it. When I took it out, I was expecting at least hull speed of 6mph. Guess what. Using an 84v pack, 60amps, I got to a whopping 2.5mph. When I upped it to 120amps, it blazed to 3mph. When I jumped it up to 200amps, it got to 3.5mph and then shortly after the motor shut down due to over heating. By the way, the controller was rated to 500amp, it was the motor that shut down.
That was several years ago. Since then I have done a number of conversions. With each one, I have been certain to match the lower leg to the performance characteristics of the motor. Check out the "Elco" post I put up. They are a leading manufacturer of electric marine propulsion solutions and they have the exact same approach as I do.
Just trying to be helpful and share my real world experience.
Scott
Posted by: smasterson2@gmail.com
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