The payback period is how long it will take to recover money invested in a project, and the so-called straight-payback-period calculation is the simplest way of determining the project's ...

Use a solar panel cost calculator using this formula to calculate the payback period. Plenty of metrics can help you decide which solar option is best for you, but studies show most solar shoppers ...

5. Calculate Your Lifetime Savings Subtract your solar payback period from 25, which is the expected number of years a solar panel lasts. Multiply your result by your annual energy cost.