Re: Repowering with an electric engine?
When you're speaking of energy, there's just no such thing as a free lunch. As others have pointed out, nothing beats the energy density of diesel. If you read or watch the blogs of long range cruisers, you can glean that even if you had every square inch of deck covered with solar cells, it is very common to not have enough sunlight to charge a normal house bank. Chuck and Laura Rose have frequently had to run their diesel to charge the bank enough to run their watermaker, if nothing else, because they went many days at a time without sufficient solar power.
With current technology, about the best one could do is to have a huge battery bank of batteries coupled with a dedicated high-output generator, to perform the bulk charging as efficiently as possible. More systems, more chances to fail, not to mention expense.
s/v My Sweet Girl!
Catalina 30 (Mark I)