Glenn, Your in the keel cooler will work fine, it should also work on
the hard if that side of the keel is not in direct sunlight all day.
Don't forget that these compressors without fan cooling depend only
on super-cooled refrigerant as the main source of compressor heat
removal, so if the compressors are located in a tight area supplemental
cooling is required especially in tropical climates. Frigoboat has now
added a small heat sink to compressors connected to their keel cooler
compressors but I don't think it is large enough to do any good in
the tropics.

Dick