United States
Seattle 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
8.0 kW
Annual Yield
10,000 kWh per year
Payback
7.4 years
Avg install cost
€16,200
Annual savings
€1,750 per year
Lifetime value
€34,000
Why this city shines
A Ballard craftsman fits 8 kW between dormers; cool temperatures keep efficiency high for 10 MWh per year.
Rooftop solar in Seattle works with a 8.0 kW array that delivers about 10,000 kWh yearly. Install costs near €16,200 translate to roughly €1,750 annual savings and a 7.4-year payback under typical tariffs.
Offsets roughly 4.2 tonnes of CO2 annually.