When we were cruising in the
caribbean for a year in 2001 to 2002 it cost roughly around 1100 per month, excluding boat repairs,
insurance and boat mortgage (if applicable). We went to the
bahamas, down through ragged key in the Jumentos and then a month in
Cuba. We were also completely
solar powered and tried to always
anchor out except when we needed
engine repairs (which was far too often), so no
generator costs or repairs, which could in and of themselves be substantial.
Anchoring out is extremely
cheap and your best
insurance plan is to get as much technical experience on your engines as practical as engines were by far our most significant cost.