You're installing batteries in a 27-foot boat, so I assume your physical space is limited. That's certainly what I found repowering our 27-foot Cape Dory. Living and sailing in Michigan gave rise in our case to another consideration, that may or may not apply to you, in that we want to be able to remove the batteries from the boat seasonally for storage. The thought of building and rebuilding a full 16-cell (I use prismatics) battery back every spring and fall wasn't appealing. In addition, the access to the motor space where I needed to install the batteries was through a narrow space behind my companionway ladder. Maneuvering an all-in-one unit that weighs over 200 lbs, and measuring over 30"x15"x12" high, thru the narrow opening seemd an impossible feat. So I built four 12-volt banks, but used waterproof connecters from each bank to a BMS that monitors, contols, and balances the whole assembled traction battery..
Obviously, if your sailing ground is temperate year round, and leaving the batteries on the boat is not an issue, nor is access to the installation space, then probably none of the above applies to you!
Good luck!
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