Solar Break Even 2020

On hot sunny days like this when we are running the air conditioner pretty much all day my thoughts turn to solar power.  I was wondering what the break even time was for solar, using numbers (below) for Austin, TX electricity and raw panels, retail price.  I realize there are (possibly large) installation costs and other support hardware, but just as a stake in the ground for a number.  I was surprised that at the top tier the payback was less than two years.

Panel Cost Panel Watts Sun Hours / Day Electricity $/KWH Panel kWH/Year Panel $/year Break Even (Years) Notes
$177.12 320 8 0.02801 934.40 26.17 6.77 Austin Tier 1
$177.12 320 8 0.05832 934.40 54.49 3.25 Austin Tier 2
$177.12 320 8 0.07814 934.40 73.01 2.43 Austin Tier 3
$177.12 320 8 0.09314 934.40 87.03 2.04 Austin Tier 4
$177.12 320 8 0.10184 934.40 95.16 1.86 Austin Tier 5

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