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env.solar-payback Calculator
Calculates the simple payback period for a rooftop solar installation from system cost, government incentives, and projected annual electricity savings. Most residential systems pay back in 6–12 years, then generate free electricity for another 15–20 years.
Inputs
System Cost
Reference formula or conversion factor shown for context.
Annual Savings
Reference formula or conversion factor shown for context.
Incentive Pct
Reference formula or conversion factor shown for context.
Degradation Pct
Reference formula or conversion factor shown for context.
Results
net cost after incentive
The total monetary cost computed for the given inputs.
payback period (years)
Time to recover the initial investment from cumulative cash flows. Most firms target 2–5 years. Does not account for the time value of money — use discounted payback for rigour.
25-year savings (est.)
Total money or resources saved compared to the baseline or alternative scenario.
tax incentive
Sample size or count used in the calculation.
NPV over 25yr at 5% discount
Total number of items or occurrences.
federal ITC (2024)
Reference formula or conversion factor shown for context.