To touch on the subject of our refrigeration
once again, I thought of a couple of extra points...
In our case, before dropping the completed box in it's new home, it was wrapped in 2 to 3" of Reflectex (foil/bubble wrap sheet). This was flat easy to do, and offered even more IR barrier, with extra insulation
as well. The elephant's trunk ducting to the sealed compressor
box was Reflectex wrapped too, and the sealed compressor
box's "out" muffin fan was doubled up, so that now, there is one in the "in" vent as well. (Thanks for that one go to Don Clark, my marine refrigeration
expert, and friend)...
ALSO... Consider this important fact:
With ALL things being equal, a refrigeration OR ice box such as ours, may very well be 30% to 50% MORE efficient on a Searunner
, than on a Cat or monohull! Why? Location, location, location.
The preferred location on a Searunner, (as those with one know), is not in a counter top, it is below the floor, in the sterncastle. This is a great location, as momentarily lifting ones feet for access, only takes seconds, vs first clearing the counter, to get to the refrigerator's lid.
The REAL advantage is ambient air temperature around the box, the ducting, and the compressor!
When we were in the Chesapeake, for example, and air temp during a heat wave was 105 F, the water
temp was in the 80s. The box and compressor are sealed under gasketed floor boards, inches from the hull
, under the wl... The "in" ducting to the compressor is in this 18 to 20 degree cooler air too, and the warmer "out" ducting is heavily insulated. The "in" vent is also below the wl, but remote
from the box.
We use a green LED to know when the unit kicks on, as we can't hear it otherwise, and we have a Radio
Shack indoor/outdoor thermometer tell us what the temp is in the box, without opening the lid, which is even further insulated by padded carpet! The compressor just kicks on for a few minutes, every couple of hours or so! (Far less in winter)...
Like all of my systems, I FIRST did my homework, then I applied everything I had learned from having done this stuff since childhood. If I was doing it over now, the results would be even better, with the more efficient "variable speed compressors" that they've come out with... (which ours is not).
Many of the "truisms" that I read, like: "You can't use solar panels
for total power, WITH refrigeration onboard", "Refrigeration takes about 100 A.h. / day", or "Air cooled will not work in the tropics", are just not necessarily true. In our case, all three have been proven to be patently false!