☀️ Solar ROI Calculator
Enter your system size, local sun hours, electricity rate, cost, and incentives to see annual generation, bill savings, payback period, and 25-year return on investment.
☀️ Estimate Your Solar Returns
What is a Solar ROI Calculator?
A solar ROI calculator turns a quote into the numbers that actually matter: how many kilowatt-hours the array will produce each year, how much that trims off your power bill, how long it takes to recoup the investment, and what the system is worth over its 25-year life.
Enter your system size and peak sun hours to estimate generation, your electricity rate to value the savings, and your installed cost and incentives to find net cost and return. These are estimates for planning, not professional electrical or financial advice.
❓ Frequently Asked Questions
How is solar payback period calculated?
Payback is your net system cost (price minus rebates and tax credits) divided by your annual bill savings. If a system nets out to $12,600 and offsets $1,478 of electricity a year, it pays for itself in roughly 8.5 years. Everything after that is essentially free generation for the remaining life of the panels.
What are peak sun hours and why do they matter?
Peak sun hours are the number of hours per day your location receives the equivalent of full-strength sunlight (1,000 W/m²). A 6 kW array in a 4.5 sun-hour region generates far more than the same array in a 3 sun-hour region, so this single figure drives your annual kWh and therefore your savings.
Why use 25 years for lifetime savings?
Most quality solar panels carry a 25-year performance warranty, so 25 years is the standard horizon for modelling lifetime value. The calculator multiplies your annual savings across 25 years and subtracts the net cost to show total net savings and return on investment.
Are these solar ROI numbers exact?
No — they are estimates for planning, not professional electrical, engineering, or financial advice. Real output varies with shading, panel orientation, system losses, gradual degradation, and future changes to utility rates. Use the figures to compare scenarios, then confirm with a certified installer.