Wednesday, September 30, 2009

Re: [Electric Boats] Repowering 40' 1975 20,000 lb sailboat

 

Joe,

I'm curious about what percent of that 7,500 miles you were able to sail - I would guess not much sailing in the rivers & ICW.

For electric you would need a budget of how much speed and time you need to run each day and use that (plus house loads) to size the battery bank. Ballpark - 1000 pounds of batteries would give you about 30 miles at 5 mph or 55 miles at 4 mph.

Would you have access to shore power for recharging most nights? If not, that can be another deal breaker.

A little gas generator (and a powerful battery charger) would be a comfort and a lot smoother and quieter than the ole' A4. The middle size Honda would probably get you 4 mph if you had a charger that could load it to 1.5 kw. I'd keep it on the swim platform.

Still hard to beat AGM lead acid batteries for a sail boat - especially if you can remove some of the lead you already have in the basement. A lithium bank will increase initial cost 5x and its benefits of light weight and rapid charge -discharge tolerance are not that important in your application.

Denny Wolfe
www.wolfEboats.com

[Non-text portions of this message have been removed]

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