http://www.torqeedo.com/uploads/medi...english_05.pdf
They say it will push a 6500lber for close to 30 hrs on two twelve volt batteries. Available online now for $2200 +/-. It weighs 25 lbs and breaks down into a waterproof case. There is a smaller one for dinghies where the battery is integral.
I am very interested in this and just wondered if anyone had seen/tested these.