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Does my roof need to face south?

An unshaded roof that slopes towards the south will produce the most electricity for a given set of panels.  However, even if your roof is more east or west facing, you can still get strong results.  A west facing roof might produce 82% of what the same array on a south facing roof would produce.  For this program, an array must produce more than 80% of what a south facing roof would produce, so an unshaded west facing roof is fine.

And if you have a flat roof you can orient your panels to maximize efficiency.

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