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Wow, you are right! Thanks for the catch! Yes, TEP's rooftop solar analysis assumes a $21,450 system cost, $6457 tax incentive, optimal fixed panel tilt of 26° (adjusting tilt throughout the year helps slightly), 20-year maintenance cost of $3960, breakeven after year 10, and a 20-year net...

My main motivation for going solar is our utility's residential rates have been skyrocketing since 2008:

Yes, my daily usage averages 36.8 kWh/day. I'm not sure how TEP calculates their recommended solar system capacity, but more capacity would be better as long as the pay-back period is short. This system will be grid-tied only because TEP's reliability is good and outages are infrequent...

I am with Tucson Electric Power (TEP) and I understand they scrapped their net metering for a new "solar export program" in 2018. The initial TEP solar-energy export rate is 9.64 ¢/kWh compared with net metering at a retail rate of 10.8 ¢/kWh, locked in for each customer for 10 years from the...

I have a (almost) flat-roof residence in Tucson, AZ (32°N latitude) and want to design and install a high-quality DIY grid-tied system. My annual residential energy usage (reported by utility) is 13,438 kWh. Utility recommends a 6.6kW (DC), 22-panel (423 sq.ft., 39.3 sq.m.) system. Panels point...