Model solar payback transparently
Solar ROI Calculator
Project year-by-year solar value, maintenance, cumulative savings, payback, and return using editable financial and performance assumptions.
Smart result
Your ROI and payback estimate will appear here
The projection models every year separately, including price escalation, solar degradation, maintenance, and self-consumption.
Understand the calculation
Payback measures how long projected net savings take to recover net investment. ROI projections depend strongly on generation, self-consumption, tariffs, escalation, degradation, maintenance, and the analysis period.
Results are planning estimates, not engineering designs, quotations, eligibility decisions, or guaranteed financial returns.
Frequently asked questions
How is solar payback calculated?+
Payback occurs when cumulative annual net savings reach the net investment. The model interpolates within the crossing year.
Does electricity-price inflation improve payback?+
Higher future tariffs increase projected solar value, but escalation is uncertain and should be tested as an assumption, not treated as guaranteed.
Does panel degradation affect savings?+
Yes. Output generally changes over time, so the calculator reduces projected generation by the degradation rate you enter.