Solar Payback & ROI Calculator

Does the solar payback calculator account for rate inflation?

No. It computes a simple, undiscounted payback and 25-year net savings, ignoring electricity-rate inflation, panel degradation, financing, and the time value of money. Annual savings are held flat at monthly bill times 12 times the offset percentage. Treat the output as a rough comparison rather than a full financial model.

Related questions

• What is the payback period on a $25,000 solar system?
• How are solar incentives applied to the cost?