Solar Payback Calculator

A solar system is an investment, and like any investment it deserves a payback calculation. This Solar Payback Calculator works out how many months it will take for your electricity savings to repay the system's cost, and what the investment is worth over its 25-year panel life.

The math compares the system cost with your monthly electricity bill that solar will eliminate. The payback period is cost divided by monthly savings; the long-term return includes both the savings and the avoided tariff increases that have been a constant of Pakistani electricity pricing.

With tariffs rising over time, the payback period you calculate today is a ceiling — future tariff increases shorten it. This is the strongest argument for solar in Pakistan, and this calculator quantifies it.

The calculation assumes your usage stays constant and the system generates its rated output. In practice, soiling, shading and inverter losses reduce output slightly, so treat the payback as an optimistic planning figure and add a 10–15% margin.