William Bronson wrote:Clearly chest freezers are more efficient, but an upright freezer converted to a fridge is probably more efficient than a standard refrigerator.
Dany Richard wrote:Here's a follow up question. I can't find anyone online that has ever built there own chest type fridge (plywood shell, a ridiculously high R value walls, salvaged condenser tubes, etc) with components from an old freezer.
I'm not asking if it's worth the effort, but only if it's possible just to see how far we can take the energy efficiency?
Sebastian Köln wrote:Yes. The thermostat has an adjustment screw. I was lucky enough that I could turn it far enough to make it a fridge.
tel jetson wrote:it also occurs to me that replacing the AC motor on a freezer with a DC motor and skipping the inverter could solve some solar startup problems, but electrical engineering is well outside my expertise. in my limited understanding, though, a DC motor can handle variable voltage, so just hooking a PV panel up relatively directly would result in the motor turning at different speeds. unless the speed gets way too high, neither the motor nor the compressor should be negatively affected (again, I'm not at all certain about this, so feel free to correct/educate me). if the freezer had a dedicated PV system, it could just always be on.
of course, I have no idea what variable speed DC motors cost, or how difficult it would be to retrofit one. my guesses are, respectively, a lot and very.
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