EXACTLY my thought. A purpose built electric sailboat with the batteries right down on top of the "rest of" the ballast has got to be very efficient in terms of stability and space usage. This would be particularly so with FLA batteries. Or Edison cells. I would be very interested in Edison cells if they could be had cheaply in the U.S. Large single FLA cells right down in the keel would be great. The tops of the cells could be maybe just below the cabin sole for easy access, for routine testing and watering. No cabin space would need to be sacrificed for the bank. A half ton or a ton of batteries would not bring her down below design waterline if they were part of the design.
When you think of the biggest factor in achieving good range or power, which is the size of the bank, and the tons of ballast in a fairly large cruising sailboat, it really is a no brainer to have some of that ballast serving a second purpose: the storage of energy.
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