One problem I have heard about generators on boats is they do not get used enough and tend to have problems due to that. Is it possible to get a boat with two generators that could drive an electric motor to get you up to speed and then have a generator and a backup for when you are on the hook? Generators are pretty quiet and in that way you would have more flexibility. You could also avoid the investment in batteries. If you did not need full speed you only run one generator. Have not done the math, but it seems like that would be a better combination that some of the bigger boats that have a main propulsion motor and a generator installed. Downside would be that the control system needs to be more complex and you would have to equal our the hours on both engines.