Solar Panel ROI Calculator

Enter your system cost, electricity rate, monthly energy production, and system size to find out how quickly your solar panels pay for themselves. The Solar Panel ROI Calculator returns your payback period, annual savings, 25-year lifetime savings, and return on investment percentage — factoring in the federal tax credit if applicable. Also try the Annual Energy Output — Solar Carport.

USD

Total installed cost of your solar system before any tax credits.

kW

Total capacity of your solar system in kilowatts.

kWh/month

Expected monthly kilowatt-hours your system will generate.

$/kWh

Your current cost per kilowatt-hour from your utility bill.

The federal Investment Tax Credit (ITC) reduces your net system cost.

%/year

Average annual % increase in electricity prices. Typical US average is 2–4%.

Most solar panels are warrantied for 25 years and can last 30+.

Results

Payback Period

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Net System Cost (After Tax Credit)

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Annual Savings

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Lifetime Savings

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Total ROI

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Results Table

Frequently Asked Questions

How do I calculate the solar panel payback period?

Divide your net system cost (after any tax credits) by your annual electricity savings. For example, a $14,000 net cost with $1,350 in annual savings gives a payback period of about 10.4 years. After that point, all savings are pure profit. See also our find Payback Period with Energy Payback Time Calculator (Solar/Wind).

How do I calculate solar panel return on investment (ROI)?

Solar ROI is calculated as (Lifetime Savings − Net System Cost) ÷ Net System Cost × 100. A system that costs $14,000 net and saves $45,000 over 25 years would have an ROI of about 221%. The higher your electricity rate and usage, the better your ROI.

What is the federal solar tax credit and how much is it?

The federal Investment Tax Credit (ITC) allows you to deduct a percentage of your solar installation cost from your federal taxes. As of 2023–2032, the credit is 30%. This directly reduces your net system cost and shortens your payback period significantly.

What factors most affect solar ROI?

The biggest factors are your local electricity rate, how much energy your system produces (dependent on sun hours and system size), the upfront system cost, available incentives like the federal tax credit, and how quickly electricity prices rise over time. Homes in sunny regions with high utility rates see the best ROI. You might also find our Solar Panel Wattage Calculator useful.

Is solar worth it if my payback period is over 10 years?

Generally yes — most solar panels are warrantied for 25 years and last 30 or more. Even a 12-year payback still leaves 13+ years of free electricity, resulting in substantial lifetime savings and a strong ROI. Rising electricity rates make the math even better over time.

How does electricity rate inflation affect my solar savings?

As utility rates increase each year (historically 2–4% in the US), your solar system saves you more money annually because the electricity it generates becomes increasingly valuable. This compounding effect can significantly increase total lifetime savings compared to a static rate assumption.

What is a good payback period for solar panels?

A payback period of 6–12 years is generally considered good for residential solar. The national average in the US is around 7–10 years. With the 30% federal tax credit and rising electricity rates, many homeowners achieve payback well under 10 years.

Do solar panels increase home value?

Yes. Studies by Lawrence Berkeley National Laboratory found that homes with solar panels sell for about 4% more on average. This added resale value is not captured in a standard ROI calculation, meaning the true financial benefit of going solar is often even higher than the calculator shows.