Sunday, January 3, 2010

Re: [Electric Boats] New to the group, interested in converting 25ft launch from diesel to electric

 

Mastervolt makes the SilentProp 10 a 10 Kw continuos AC motor, Selling points for this drive for me is that it is AC (no permeant magnets or brushes to fail),  totally sealed, 48volts So still qualifies as low voltage from  an insurance perspective.  And has a company backing it that will most likely still be here in ten years.  Whether  they will still support this product is another mater. ;-)



For batteries if range is your number one concern get LiFePo4 cells 15 3.3 cells make 48 volts. Buy the biggest you can:

Or if money is the number one concern get the best LEAD AGM you can afford. 

Ta Ta. 

On Jan 2, 2010, at 9:34 PM, barnabyrands wrote:

 

Hello all, lots of fascinating information on this group site!

I have a 7.6 metre timber launch that I've just finished restoring, and I have put a 26Kw diesel in it, which pushes the boat past hull speed comfortably. Unfortunately, its extremely noisy, and after spending three months redesigning and building a new engine enclosure, its still far too noisy.

So, I'm seriously considering selling the diesel and converting to an inboard electric system.

I have lots and lots of questions, and thought it might be useful to ask to be pointed in the direction of some posts / case studies of people with similar projects. Any suggestions and considerations would also be very welcome.

The details of the boat are:
7.6m LOA, approx 7m LWL
Max WL beam = 2m
Displacement = approx 3000kg
I estimate that 10 kilowatts is what the hull form needs to be driven to hull speed (hence a 26Kw engine running at 60% capacity at present)

The boat is currently sitting above its lines, so weight for batteries is not a concern - especially after the diesel is removed.

Very interested in any suggestions people may have for me.

Barney


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