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What works for me is two lead-acid deep cycle size 27s, with the battery switch set to both. The New Mar PT-14 charger is almost always plugged in to shore power, charging both batteries at once. I use both batteries to start the engine, and for everything else, which is only some lights and the bilge pump. I am almost always using shore power for light, heat, vacuum, and computer, and occasional power tools. If I spend a night at anchor I use one battery for house. The New Mar charger is used by commercial fishermen. It cost over $400 but is worth every penny. It runs almost constantly when in a slip, and automatically switches between three phases; bulk, absorption, and float. I have had one for over 20 years and it has always worked perfectly. However, I had to replace the fan in it a few years ago because it was worn out and noisy.
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