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Zanshin I just had the 45DS out for a week that we have at CYOA. It has a 12 volt fridge and freezer as well. Jeaneau put five house batteries in the boat from the factory. The owners had two more added and a 120 amp alternator at Bay Yachts before it came down to us. They simply added them to the current bank. I found that overnight with both the fridge and freezer running the total bank would drop by .5Volts. I think in the long run based on what I have seen in the charter fleet the larger batteries hold up better.
I would look at putting in a selector switch for two banks. I would buy two of the larger batteries for your new bank and plan on replacing your four older batteries with two of the bigger ones when they die.
Jay
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