What is a good ROI for solar panels?

A 10–20% IRR is typical for well-sited US systems with the ITC. Net ROI over 25 years commonly reaches 150–300% of initial investment in high-electricity-cost areas.

Does solar add home value?

Studies show solar adds ~$4/watt to home value on average in the US (Lawrence Berkeley National Lab). A 10 kW system typically adds $40,000 in market value.

How does electricity rate escalation affect ROI?

Each 1% annual rate increase improves 25-year ROI by roughly 5–8%. Assuming 2–3% annual escalation is conservative and widely used in financial models.

Solar Panel ROI Calculator

Calculate the return on investment (ROI) and internal rate of return (IRR) for a residential or commercial solar panel installation over 25 years.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)

σy — Normal Stress Y (MPa)

τxy — Shear Stress (MPa)

⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.

How to Use

Enter the values for the patient or scenario you are assessing. Calculate the return on investment (ROI) and internal rate of return (IRR) for a residential or commercial solar panel installation over 25 years. Use the solar roi result to inform your clinical assessment.

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Frequently Asked Questions

What is a good ROI for solar panels?

Does solar add home value?

How does electricity rate escalation affect ROI?