Solar Panel Payback Calculator
Years to break even on a home solar installation.
Enter your values
Enter the system cost you are working with.
Enter the tax credits / rebates you are working with.
Enter the current avg monthly electric bill you are working with.
Enter the percent of bill offset by solar in %.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Payback period
- 8.6 years
- Net system cost
- $14,000.00
- Annual savings
- $1,620.00
- 25-year total savings (est.)
- $26,500.00
Quick answer
Payback period is the net system cost divided by annual electricity bill savings.
payback years = (system cost - incentives) / annual savings
At a glance
| What it does | Years to break even on a home solar installation. |
|---|---|
| Category | Home & DIY |
| Inputs needed | System cost, Tax credits / rebates, Current avg monthly electric bill, Percent of bill offset by solar |
| Main output | Payback period |
| Formula | payback years = (system cost - incentives) / annual savings |
| Cost | Free — no sign-up, no download |
How to use the Solar Panel Payback Calculator
- 1Enter the total solar system cost and any tax credits or rebates you qualify for (like the 30% federal tax credit).
- 2Enter your current average monthly electric bill.
- 3Estimate what percentage of your bill solar will offset to see your break-even point in years.
Inputs explained
- System cost
- Enter the system cost you are working with.
- Tax credits / rebates
- Enter the tax credits / rebates you are working with.
- Current avg monthly electric bill
- Enter the current avg monthly electric bill you are working with.
- Percent of bill offset by solar(%)
- Enter the percent of bill offset by solar in %.
Worked example
Using the values the calculator loads with:
Inputs
- System cost20000
- Tax credits / rebates6000
- Current avg monthly electric bill150
- Percent of bill offset by solar90 %
Results
- Payback period8.6 years
- Net system cost$14,000.00
- Annual savings$1,620.00
- 25-year total savings (est.)$26,500.00
Frequently asked questions
What's a typical solar payback period?
Most US homeowners see payback in 6-10 years, after which electricity is essentially free for the panel's remaining life.
Do panels lose efficiency over time?
Yes, typically about 0.5% per year, but most panels are warrantied for 25 years at 80%+ output.
What do I need to enter into the Solar Panel Payback Calculator?
Just 4 values: system cost, tax credits / rebates, current avg monthly electric bill, percent of bill offset by solar. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Solar Panel Payback Calculator work out the answer?
Payback period is the net system cost divided by annual electricity bill savings. It applies the formula payback years = (system cost - incentives) / annual savings and shows the working so you can check each step by hand.
Is the Solar Panel Payback Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.