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Does that site have its own crew of DOTs, or are YOU the sole member of said "solar" faction?
In that situation would it be better to have reflective material in the box and the copper pipes painted black to absorb the heat? I dunno enough about how all that works to know if that would be more effecient (something to reflect more sun to the pipes that absorb the heat) versus a "black box" (the non-recording type so no "here hold my beer" proof of pre-accident antics) that heats the air which then in turn heats the pipes. I suspect using angled panels with the copper pipes painted black and suspended in the "valleys" might focus more sun/heat into the anti-froze than just running copper tubing through said non-recordable black box....but whatdoiknow? I can't fly a kite!
Just how I'm doing a room add on. Can't build it overnight, but you can't see it either.