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While the boat comes with a normal air-cooled fridge by default, I opted to add a second unit as a freezer which is keel-cooled. After a season I realized that I don't need to freeze food very often as I am often close to stores but I do want additional fridge space for cold drinks. Thus I changed the original thermostat, which only allows freezing temperatures even at the warmest setting, for a new one which allows a large temperature range to be used and currently am using the freezer for my cold drinks and the fridge for everything else. This works out well enough, and the insulation on the freezer section is excellent and the keel cooling works very well, too. Keel cooling means that the warm parts of the cooling circuit are piped to a heat exchanger in the hull and the heat goes into the surrounding water rather than the normal air system, which on Zanshin blows the warmed air from the compressor area into the back of the stove and the top of my range is always a bit warm to the touch from this.
I got some special insulating foam from Mr. Cool in St. Martin in May 2014 and cut it to shape so that I could place an insulating layer at the bottom of the freezer in order to reduce energy consumption. I am monitoring it as I write this. Since the fridge and freezer energy consumption accounts for most of the energy use aboard Zanshin even a small increase in efficiency will make a significant reduction in my energy use.
I've also gone and purchased an additional portable fridge/freezer, a Waeco CDF 36, which runs off either the house bank or AC current. While this is usually not needed, it does provide some extra capacity for cold storage.

Freezer emptied and cleaned My freezer, which had been chewing up a lot of my power keeping a mere 2 steaks and some hot-dogs frozen, finally turned off and cleaned.
(2013-03-13 13:58:07 NIKON D7000 with a "18.0-200.0 mm f/3.5-5.6" lens. [f/3.5, 1/100s] ISO 250 Focus 1.00m)
Freezer emptied and cleaned
Old and New thermostats The old thermometer, center, only works for freezing temperatures while the new has a much broader range.
(2014-01-23 08:54:01 NIKON D7100 with a "18.0-250.0 mm f/3.5-6.3" lens. [f/5.6, 1/60s] ISO 200)
Old and New thermostats
Temporary temperature probe position The temporary position of the temperature probe for the new thermostat in the freezer.
(2014-01-23 09:29:48 NIKON D7100 with a "18.0-250.0 mm f/3.5-6.3" lens. [f/5.6, 1/60s] ISO 200)
Temporary temperature probe position
Fridge and Freezer compressors The left compressor is the fridge compressor with a fan for cooling, The right one is for the freezer and has no fan as it uses keel cooling.
(2014-02-06 12:01:11 NIKON D7100 with a "18.0-250.0 mm f/3.5-6.3" lens. [f/4.5, 1/60s] ISO 200)
Fridge and Freezer compressors
Measuring and cutting insulation Measuring and cutting the insulation foam to fit in the bottom of the fridge and freezer.
(2014-05-07 06:51:46 NIKON D7100 with a "18.0-250.0 mm f/3.5-6.3" lens. [f/3.5, 1/100s] ISO 400)
Measuring and cutting insulation
Fitting foam in the freezer The black insulation foam might look ugly, but I hope to reduce my energy use significantly by adding a bit more insulation.
(2014-05-07 06:52:04 NIKON D7100 with a "18.0-250.0 mm f/3.5-6.3" lens. [f/3.5, 1/60s] ISO 200)
Fitting foam in the freezer
Waeco CDF 36 Freezer This fridge/freezer augments my built-in devices when needed
(2017-03-14 12:38:33 NIKON D7100 with a "18.0-250.0 mm f/3.5-6.3" lens. [f/8.0, 1/60s] ISO 100)
Waeco CDF 36 Freezer
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