| seems light to me.
I would consider Two stage chiller system. A night chiller 32K BTU And a Day chiller Of around 48K. You may need both running on very hot tropical days.
50 K seems to light to me. (but I am in Ft. Lauderdale area) and I don't know your boat. In Example a Azumit 65 takes over 90K BTU.
As a General Rule a professionally installed chilled water system can cost twice as much as DX. The plumbing and insulation takes a lot of skill to do it right.
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