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Published on Aug 11, 2012
Date: 20120811_133941. Outside temp: 22 deg C, Clouds all day. Tube on the ground: for test (without heat pipe. 87 deg. C) with sensor inside. The temperature increased in 1 hour from 22 to 87 deg. C Solar panel temp. in function 43 deg C (constant temp in one hour) during test Conclusion: I need more panels.