Al and All, As you know I'm new to the list so forgive me if I put my foot in my mouth publicly and say the wrong thing at the wrong time but I have extensive marine experience (own a sailboat) and thought I'd ask if it were a popular move to use golf cart batteries for greater capacity? If so, there is a box made by Blue Sea and sold under the West Marine label which looks like this. http://www.westmarine.com/webapp/wcs/stores/servlet/SiteSearch?storeId=10001&catalogId=10001&keyword=3669876
Forgive me if I'm off base but thought I'd make some aware of these well made boxes. Glyn