Re: [Electric Boats] Advice on repowering a Cal 29

 

David,

You're correct, 30nm at 5 knots is not something that is normally accomplished with the electric motor and battery bank alone.  You would need some type of alternate power to put a charge back into the batteries and keep you going.  If it's mainly the issue of the cost of a diesel genset, check out Capt. Mike's setup on his Nonsuch 30.  He has a Thoosa 9000 - 48v system.  He uses a small Honda 2000 when he needs to power for any length of time and he is quite pleased with the range it gives him.  His blog is:

http://biankablog.blogspot.com/

He has been electric for 3 seasons now and loves it.  He lives on his boat from spring to fall, mostly on a mooring and at anchor.  He rarely heads into a dock for recharging, using his Honda when needed, and also a wind generator and solar panels.  Check it out - his blog is a wealth of information on what works.

Sally

On Mon, Nov 1, 2010 at 1:16 PM, dfdines <dfdines@gmail.com> wrote:

 

I have a 1973 Cal 29 that I own with a partner. It has a 1 cyl Farymann 12 hp diesel that works, but needs lots of attention. We both agree that we should replace it to get more power and less vibration and noise. I would like to put in electric for noise, smell and maintenance reasons. His main concern is range so he is leaning towards a diesel. We agree that if we go electric, it should be to be able to motor from Provincetown through the cape cod canal, at about 5 kts, about 30 nm in total, and there is often a good breeze on the nose. Electric Vehicle of America did a proposal for me that said it would take about 60 amps to drive the boat at 5 kts (using their EY QuieTorque ibl180 motor). That said, even a 400 ah battery bank would not get us through the canal (assuming 80% DOD). I was hoping to avoid the extra money, weight and maintenance for a genset, but it seems that this is the only way to make this type of trip. (For typical daysailing off the mooring, I was considering the Airbreeze Marine from Hamilton Ferris, which seems like it would be more than sufficient).

So it will come down to the trade off on cost between another diesel and an electric with a genset and my guess is that the payback on the electric/genset combo would be pretty long.

Any advice on design, wind turbines, gensets and vendors in general would be appreciated.

David

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