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Re:Solar PV rapidly becoming the cheapest option to generate... by marze on Monday October 24, 2011 @10:29PM (#3152559)
$20000 isn't a good price. Check here to see more competitive pricing:

http://www.sunelec.com/comparisons_of_grid_tie_systems_price...

Optimal tilt just refers to the tilt the panels are installed at, no tracking.

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