United States
Boston 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
8.4 kW
Annual Yield
11,200 kWh per year
Payback
7.3 years
Avg install cost
€17,800
Annual savings
€2,050 per year
Lifetime value
€36,500
Why this city shines
Cambridge triple-deckers model 8.4 kW, banking SMART-style credits and 11.2 MWh to cover heat pumps.
Rooftop solar in Boston works with a 8.4 kW array that delivers about 11,200 kWh yearly. Install costs near €17,800 translate to roughly €2,050 annual savings and a 7.3-year payback under typical tariffs.
Offsets roughly 4.6 tonnes of CO2 annually.