I just changed our Ericson 27 (6800lbs) from a 2kw 24v system to a 5kw 48v system. At 2kw, the boat was fine in the harbor, but right at the practical limit for use in SF Bay. Add a stiff wind on the nose, however, and 2kw wouldn't move the boat. With 5kw on line, heavy seas and wind aren't a problem.
The power ratio isn't for flat water, but rather to give you an edge when the going gets rough. The top speed has gone up a little, but the real advantage is being able to maintain control in adverse conditions.
Be Well,
Arby
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