Hi, I am designing a water current turbine (no head) expecting to produce 150 watts on average. I am trying to choose a generator, but for that i need to know the rpm range. I don't how to calculate it. The formula I found for common hydro doesn't suit with zero head. And the method I found for wind power can't be useful because using wind power efficiency graph. And this graph should be completly different for water power. Isn't it?
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