Not yet other than just in my head, was looking like around 10 years.
http://rredc.nrel.gov/solar/codes_al...ATTS/version1/
I am nearest Lake Charels, Louisiana on that map.
telling me that 2000 watt (nameplate) would give $208 per year in savings (at current rate of 7.9c per kwh)
So lets say $5 per watt (does that include grid tie inverter?) $10,000 *50% = $5,000
so $5000/$208(per year) leaves us with
24 years Can that be right? after a 50% credit?