Economics of rooftop solar
Unbiased academic information to help households decide on solar PV panels.
Optimal PV system
This site helps households across the world choose the best installation size for rooftop photovoltaic (PV) panels.
Economic analysis
We are finance students and the optimal decision is based solely on economic criteria. Even though we love renewable energy, the recommended installation size is the one that saves more money (more details in the How page).
Payback period
The map below shows the Payback period for the optimal PV system, that is, the time after which you will be saving the planet and making money.
Map of covered cities
Open the marker at your city to see the payback period.
Follow the link for the corresponding optimal installation size and more details.
Payback = 13 years (as of 2024/May)
Payback = 10.7 years (as of 2024/May)
Payback = 29 years (as of 2024/May)
Invesment is not recommended.
Payback = 6.1 years (as of 2024/May)
Payback = 9.8 years (as of 2023/Dec)
Payback = 15.9 years (as of 2023/Dec)
Payback = 3.2 years (as of 2023/Dec)
Payback = 10.8 years (as of 2023/Dec)
Payback = 10.2 years (as of 2023/Dec)
Payback = 2.3 years (as of 2023/Dec)
Payback = 9.8 years (as of 2023/Dec)
Payback = 11.2 years (as of 2022/Dec)
Payback = 11.8 years (as of 2022/Dec)
Payback = 8.1 years (as of 2022/Dec)
Payback = 2.1 years (as of 2022/Dec)
Payback = 4.2 years (as of 2022/Dec)
Payback = 3.4 years (as of 2022/Dec)
Payback = 12 years
Payback = 4 years
Payback = 12 years
Payback = 9.5 years
Payback = 8 years
Payback = 8.9 years
Payback = 25 years
Payback = 1.8 years
Payback = 3.1 years
Payback = 13.9 years
Payback = 10.5 years
Payback = 15.5 years
Payback = 2 years
Payback = 6 years
Payback = 16 years
Payback = 2.8 years
If your browser does not display the map above, you can get the same information in Data.
Last updated: 2/Jan/2024
More cities will be uploaded in Jun/2024