Welcome JB!
Some questions:
Will you have a generator?
Solar/Wind generators? Capacity?
Here's a start:
http://sites.
You likely have an inboard diesel (or used to) and so have a "weight credit" once you pull it and it's supporting hardware (tanks, hoses, etc) out. That's basically your allowance in batteyr weight. Motors are less that the weight of 1 battery, so hardly factor.
You'll need a little more beef to your setup than what is commonly used because of the size of your vessel. I would guestimate that you'll want something in the 20HP peak, 6HP sustained range. There is an "Eboat Spreadsheet" in the files section that will help you size the drive for your vessel. It is pretty accurate and will also provide estimates of runtime based on battery capacity.
If we assume 20HP peak - you may want to design around a 96volt system (Mark Stafford suggests this as a way to stay in "safe" 48V wiring - at least until joined at the engine). Then 150amps handles your drive at peak load which means you can find commonly available controllers and such. Now...that's 15KW - which would drain my batteries in 20 minutes, so bear in mind these are peak values. Your normal cruising/maneuverin
Propellor sizing - search the group but basically as big as you can fit. Opt for power (low pitch) over high-pitch (speed)
You'll need reduction gearing - many of us use toothed belt drives. The link I pointed you to has some suppliers/resources
Keep us posted!
-Keith
--- In electricboats@
>
> Hi all,
>
> What a great group!
>
> My partner and I are re-building an old 37' sailboat to go cruising offshore and I am very interested in learning how to make an axillary electric engine for her.
>
> Glad to be here and welcome any feedback or information on where to get started.
>
> Best,
> JB
>
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