Big wire. Makes a difference, especially at 48v or less.
If you have a typical 2 blade folding prop, I suggest a prop change, for better performance, if you will motor a lot and not mess around with all that sailboat racing stuff. My similar sized boat now has a 14x10 3 blade and it made a huge difference. A good rule of thumb is go for the biggest prop you can swing, and adjust the reduction ratio as needed. "Proper" engineering doesn't do it that way, but all those calculations often are just wrong, anyhow.
If you use belt drive, keep spare belts!
Don't use a brush type motor if you will have gasoline, propane, etc onboard. Stuff happens.
What size battery bank? Type? Batteries in a properly set up system are the most expensive component, but you don't want to go too small for your needs. And you don't want to have to be starting your generator all the time. KW from shore power are a lot cheaper than gallons of dinosaur juice, so for short trips it is nice to be able to rely entirely on shore power charging.
If you can manage to put up at least 400w of solar, that will help a lot. That will under ideal circumstances maintain your bank at a couple of kts or a bit less, typically. Just remember ideal conditions only occur for a small part of the day! Still, it can often mean the difference between running the honda and not running it. Speaking of which, with a new electric installation, you might want an outboard kicker standing by in case there are any bugs to iron out in the electric drive setup.
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