Jack, I have a 28 ft coastal cruiser which I spend the entire summer living on (nice to be a teacher). While at my YC the boat is on a mooring so dock power is not an option. While on vacation it is probably 50/50 anchoring vs. marina with power. I put in at least a 1-2 hour motor trip each week to keep the batteries topped up (that with the 2 solar chargers) have worked fairly well the past 2 seasons. My biggest draw of power are my lights (both running at night and interior lighting...although I try to not use the lights as much, it still becomes a draw) I was planning on adding radar within the next yuear or so. That was why I was considering upgrading the house batts this year...to get ready for next year as well as get a little more out of the electrical system.
Am I wroung to want to make this change?? Should I stya with what I got?? 1 starting batt and 1 12v house batt??