About the Solar ROI Calculator
Solar is one of the few home upgrades that pays you back.
This tool expresses that return as a payback period and a percentage ROI.
How this calculator works
We divide annual savings by system cost for a simple return, and compute cumulative return across 25 years.
Why it matters
- Compare solar to other investments
- See payback in plain numbers
- Model incentives and rebates
- Justify the upfront cost
Frequently asked questions
Well-sited systems often return 8–15% annually — competitive with many investments and effectively tax-free.
Significantly — rebates and tax credits shorten payback dramatically.