$20000 isn't a good price. Check here to see more competitive pricing: http://www.sunelec.com/comparisons_of_grid_tie_systems_prices.html http://www.sunelec.c

$20000 isn't a good price. Check here to see more competitive pricing: http://www.sunelec.com/comparisons_of_grid_tie_systems_prices.html http://www.sunelec.com/comparisons_of_grid_tie_systems_price... Optimal tilt just refers to the tilt the panels are installed at, no tracking.