I very highly recommend that you visit the Web
site of Jack Rabbit Marine. This is the best, most "in depth" explanation of boat electrical systems I have ever seen. It also offers products and explanations of their functions in fulfilling these needs.I have a fairly strong background in this area and I was truely impressed with their presentation. Regardless of your background you will leave with a much, much better understanding of these systems, how they overlap and their costs.I have never dealt with JRM but I do very highly recommend their site. When we outfit our new boat this summer for our 7 yr. trip I am sure my business will go their way.Since I am still computer disfunctional I must offer their address the old fashion way.www.jackrabbitmarine.comRayS/V Speedy