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Trolling Motor and Inboard Electric
Earlier in the thread was a link "cheaper solution" which used a trolling motor. About 4 years ago my wife and I modeled a similar solution for our Catalina 25 to replace the Seagull. We used a 36 volt 110# thrust (largest available) transom mount salt water trolling motor. It is connected to 3 D31 batteries from Sams Club. The batteries are mounted on the centerline under the quarter berth. The slip has power so we just plug up the charger when we are through sailing.
This setup has been fantastic for our type of sailing. We sail on an inland lake (no current) and the distance from our slip to open water is about 150 yards. We are out there to sail not to motor extended distances.
The boat is by no means fast but nothing about a Catalina 25 is fast.
What is remarkable about the setup is the ability to stop the boat on a dime and know without a doubt that the motor will not konk out. The other unique ability is the turning radius. Our motor is not coupled with the tiller so we can crank the motor around perpendicular to the long axis of the hull and spin the boat around the keel. Not very usefull out in the open water but when manuvering in tight quarters it is great.
I have researched inboard electric systems for larger boats as well and have really been impressed with the products from electricyacht.com. I don't think they were mentioned in the thread.
Side note - anyone working with DC power please be aware that a bank of 12 volt batteries wired to provide 36 volts (or 48 volts, etc.) can put out a lot of power. We had a short during instalation which melted some pretty heavy wiring, pitted a large screwdriver, and blackeded the fiberglass. I don't know how dangerous it actually is but I treat it with equal or greater respect than 110 so as not to find out.