Skip, I agree with you on a combination box that is smaller than 12 cu
ft you are better off with one or two small efficient 12 volt
refrigeration units. You may remember I was opposed to any type water
cooling on a BD compressor condensing unit. As long as you keep the
zincs on your keel cooler maintained and there is air movement around
compressor and module this system will give you good service. The
refrigeration unit you selected can deliver a maximum of 12,000 Btu of
energy in 24 hours at an evaporator temperature of +12 F.
I am not sure how a Carel thermostat will effect Frigoboat's SSC
ability to control overall energy efficiency unless it controls
evaporator temperature ON OFF differential correctly. The SSC's six
LED light bar is a good indicator of how efficiently your
refrigeration system is. At maximum compressor RPM six LEDs ON the
current draw is 6.2 amps and with only one LED on system draws only
2.95 amps. I would guess that when boxes are at desired temperatures
the number of lights ON will be between three and five LED depending
on seawater temperature.