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Join Date: Jul 2008
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Re: Voyaging on $500 per month
Until it's a new thread....
The thing that bothers me about the peltier units is that there is no (zero, zilch, nada) insulation where the unit itself sits. Anyone who has forgotten a glove on a winter day (or who forgot a hat perhaps) knows that an uninsulated area will have a drastic effect. For a fridge or freezer, all the heat leaks in right there, nullifying all that great foam insulation everywhere else.
We have an insulated freezer with 2 inches of foam, judging from the "core sample" I got when I ran new refrigerant pipes. Then I put 2 inches of foam inside the freezer on all sides, including the top -- it has a hatch under the normal hatch. By piping-in the cold, I know the while thing is insulated without a big exposure where the peltier unit is.
Ours runs at 2.5 amps (Danfoss 50 on low power setting, measured via Victron battery monitor*). It runs maybe 1/6th the time, maybe less. That's in 80 degree summers, in 74 degree water. And that is for ice cream temps of 20 degrees F, not the much easier ice temp of 32 degrees. (Ice cream is runny until about 22 degrees.) Freezer isn't huge but the overflow goes to a huge fridge, and it's keeping the fridge at a good fridge temperature too.
There's nothing like reaching into your freezer and taking out a 1/2 gallon of Bryers, while hearing the crackle of the truly cold inside of the freezer, and doing it on a hot day. Yes I started putting frosted glasses in there too.
I have a sneaking suspicion that the reason the peltier units run so much is because of the big square hole in the insulation. I'lll keep my Danfoss 50
P.S. I can only hear the fan - no compressor noise if you don't mount it sideways like the first time I mounted it.
P.P.S I own a peltier "dorm room" fridge, got it like-new at a yard sale for $15. It doesn't do cold very well.
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