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Old 03-07-10, 08:48 AM   #29
bennelson
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Join Date: Sep 2008
Location: SE Wisconsin
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Well, I WAS hoping to see higher temperatures than that as well.

I did a test last summer in my back yard, using the same barrel and pump (pump was at 12V flow rate, I had to cycle it on and off manually) but a larger panel.

That panel was 40 square feet, so basically double what's in Tim's window.
The 40ft panel heated up water rather quickly. I suppose that we should expect a panel half as big, getting half as much sunlight, to only make one quarter as much heat!
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