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Sorry, late to this thread. We have had one of these for a few months now. We ahave not taken it sailing yet, but will soon - we just put the boat in the water this passt Saturday (YEAH!!!)
We have been thusfar using the Coleman either plugged into AC, or sitting in the car/truck plugged into DC.
I did do a test, and not surprisingly, it could not freeze four gallons of water overnight. Some of it was frozen, I would say about 20%.
Global Cooling lists a similar model using the same engine, but with vacuum panels, that can go as low as -40c.
If I could get another one of these for cheap (we paid $375.00) I would be tempted to rebuild our icebox with VIPs and retrofit the cooler into this. I would need to find out what it uses to tranfer the cold to the plates, it looks liek it MAY use a refrigerant, like CO2.
I took the unit partially apart once, and if I remember, has cooling tubes encircling the sides of the inner box. Our current icebox is small to begin with, so I would think that it could easily handle a 4 foot well insulated box, say 1 in VIPs with another inch of Foam panels on either side. Not gonna happen this year, though. Could be an interesting science project.
Chris
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