Rob,
That's a beautiful boat you are getting. Oughtred is a great designer. Good luck with the survey.
I looked up the Hybrid Marine System - if it is the one in the UK, the one with the 13kw electric motor plus a diesel engine is much more power than a Grey Seal can use. It's got to cost a fortune, too, I bet more than you are paying for the boat.
It sounds like you do not expect too much speed or range - a perfect candidate for E motion! Maybe you don't need the diesel at all...
Using Oughtred's 3800# displacement figure and guessing an 18' waterline length, a 48v 100amp motor/controller with (4) 100ah 12v batteries would give a top speed of 6.0 mph for 3 miles; 50% power gives 4.8 mph for 5 miles and 25% power gives 3.8 mph for 9 miles. Weight including batteries would be around 300#, probably less than the diesel, starting battery & tank you are removing. You can use your existing shaft, stuffing box, cutlass bearing, etc and maybe even the prop. This would be cost about $2.5k if you did your own mechanical work and maybe $4k - $5k for a drop in unit like the solidnav or electric yacht systems products. Figure another $1k for good AGM batteries. Look at the power page of my website to see an example.
Denny Wolfe
www.wolfEboats.
----- Original Message -----
From: Rob Johnson
To: electricboats@
Sent: Friday, June 12, 2009 7:24 PM
Subject: [Electric Boats] Grey Seal conversion
I'm shortly to take delivery (subject to a full survey) of an Iain Ourghtred Grey Seal , with an ancient Yanmar YSE 12 in it.
I reckon I can toss that , and put a Hybrid Marine system in , based on a Beta 25 diesel , and the Hybrid Marine setup.
My belief is that I will rarely need the diesel (but its nice to know its there) , and the electric power only long enough to get the sails up.
Its on a trailer , so I can take it home and recharge the batteries , or recharge with solar panels.
But the main thing is , quiet boating , and being able to have just enough power on to keep the boat pointing in to the wind for putting up sail , or lowering it.
That is ideal for electric , and not so good for diesel , that low revs running.
I can hardly wait !.
Regards Rob Johnson.
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