2 years is the necessary time to recover all of the investment in a photovoltaic curtain wall in cities like Cancun
The generation of free and clean energy together with the energy savings from the passive properties of our photovoltaic glass, allows you to recover your investment in 3 years in places like Los Angeles or Mexico City.
You only need 4 years in cities like Barcelona, Lisbon, San Francisco or Miami. Even in cities with worse weather conditions like New York, Munich or Milan, you still have very attractive payback periods (5 years).
Check out the following link to see the payback period of your city.