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Refrigerator / freezers

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Posted by WCD on July 28, 2003, 4:15 pm

I think I heard that freezers pull a lot of current and thus use a lot
of power. People living on PV's can save a lot by using refrigerators
that aren't combined with freezers.

Do I remember correctly? Anyone have any recommendations for
refrigerators that use low amounts of electricity?

Thank you.

Posted by Steve Spence on July 28, 2003, 9:41 pm
most of your smaller energy star units, like the ones found at sears, would
have to be run for many years before losing the cost/benefit race with
specialized units for offgrid applications. the difference in cost buys a
lot of pv.

Steve Spence

Posted by Dan Metcalf on July 29, 2003, 12:11 am
Take a look at
http://www.energystar.gov/index.cfm?c=refrig.pr_refrigerators , specifically
look on the right hand side for the PDF or Excel spreadsheet detailing
energy consumption.  You'll find that the specialty refrigerators like
Sunfrost are very efficient in comparison, but you'll also not that there
are some comercial models that are really good too.  Specifically there is a
18.8cuft Kenmore made by Whirlpool that is 20% better than the standard.
Next year I would expect more refrigerators in the 15%+ range, because that
is going to be the new requirement to be labeled energy star.

Dan Metcalf
dan at metcalfsdotcom
The Sun!  Your source of energy for 5 billion years!
  Free while supplies last!

Posted by jim on August 6, 2003, 10:21 pm
 Check out the energy star ratings for refrigerators:


Some products such as Sun Frost have a separate compressor
for refrigerator and freezer:


Of course, this costs. The new generation of refrigerators
with scroll compressors and more insulation is considerably
more efficient than prior years' models.

There are many models commonly available which use less than
1 kWhr per day, which is truly amazing. In a region with three
hours of sun average per day, this requires 350-400 watts of
PV (including efficiency losses). At US $ per watt, this
comes to 400x4=$600 of PV to power a regular refrigerator.
We are at the point now where it may no longer pay to get
exotic refrigerators with how efficient conventional energy
star ones have become. If you have more sun or tax credits
or rebates on solar, it pays even less.

Anyone have any recommendations for

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