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speleding
on July 25, 2011
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Twice the height of the Empire State - massive sol...
It still needs a temperature differential to run, which will not be there at night, so the best you could get is about 50%. This is the number that Enviro Mission uses.
brlewis
on July 25, 2011
[–]
The article claims, "Because the heat of the day warms the ground up so much, it continues working at night"
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