United States
Phoenix rooftop solar case study
US homeowners combine PVWatts modeling with time-of-use tariffs, tax credits, and strong sun to keep payback compelling coast to coast.
Payback / System Size
System Size
9.0 kW
Annual Yield
16,500 kWh per year
Payback
6.2 years
Avg install cost
€17,500
Annual savings
€2,550 per year
Lifetime value
€49,500
Why this city shines
A Phoenix stucco roof tilts 9 kW south; PVWatts forecasts 16.5 MWh, dominating daytime cooling loads.
Rooftop solar in Phoenix works with a 9.0 kW array that delivers about 16,500 kWh yearly. Install costs near €17,500 translate to roughly €2,550 annual savings and a 6.2-year payback under typical tariffs.
Offsets roughly 6.9 tonnes of CO2 annually.