Budgeting & Income
Solar Panel Payback Calculator
Solar is a prepayment on electricity you have not used yet. Whether it pays depends less on the panels than on two numbers: what you paid after incentives, and how fast your utility raises its rates.
Tested against worked examplesHow we verify
Installed price before any credit or rebate.
Federal credit plus state, local, or utility rebates you will actually receive.
How much of your usage the system covers. The average US home uses about 10,800 kWh a year.
US residential rates have risen roughly 2–4% a year over the long run.
Most panel warranties run 25 years.
Pays for itself in: 9
Pays for itself in
9
Years, counting rising electricity prices.
- Net cost after incentives
- $16,800
- First-year saving
- $1,870
- Net saving over 25 years
- $51,379
Total electricity avoided, minus what the system cost.
Compare scenariosTry three values of one input
| System cost | |||
|---|---|---|---|
| Pays for itself in | 8 | 9+1 | 9+1 |
| Net cost after incentives | $14,800 | $16,800+$2,000 | $18,800+$4,000 |
| Net saving over 25 years | $53,379 | $51,379−$2,000 | $49,379−$4,000 |
Every other input stays at the value you set above — currently $24,000 for system cost. Differences are measured against the first column.
Saved scenariosSave this calculation
Saved in this browser only — no account, and nothing is sent to us. Clearing your browser data deletes them.
How this calculator works
Net cost = system cost − incentives. First-year saving = kWh offset × price per kWh. Each following year's saving grows by the rate increase, and we accumulate until the total covers the net cost. The horizon figure is cumulative savings minus the net cost.
Production is held constant and maintenance, inverter replacement (typically once in 25 years), and financing interest are excluded. If you finance the system, compare the loan payment against the first-year saving as well.
What this assumes
- The system cost, generation estimate and electricity price you enter. Generation varies by roof orientation, shading and latitude.
- Electricity prices are assumed to rise at the rate you set — the payback is highly sensitive to it.
- Incentives, net metering rules and panel degradation are included only where entered, and net metering terms have changed in several states.
What changes this number
- Local electricity price
- The value of every kilowatt-hour generated, and the reason payback varies enormously by state.
- Net metering terms
- Whether exported power is credited at retail or wholesale changes the payback by years.
- Roof and shading
- Determines actual generation, which no calculator can assess from an address alone.
A worked example
Take the $24k system, 30% credit scenario. These figures are produced by the calculator above, not written alongside it, so they always match what the tool returns.
What you enter
- System cost
- $24,000
- Incentives and credits
- $7,200
- Annual kWh offset
- 11,000
- Electricity price per kWh
- $0
What it returns
- Pays for itself in
- 9
- Net cost after incentives
- $16,800
- First-year saving
- $1,870
- Net saving over 25 years
- $51,379
Try an example
Frequently asked questions
How long does solar take to pay off?
Commonly six to twelve years in the US, though it swings widely. High electricity prices and strong incentives can pull it under six; cheap power, heavy shading, or a small credit can push it past fifteen. The calculation above uses your own numbers rather than a national average.
Why do rising electricity rates matter?
Because the savings are denominated in avoided kilowatt-hours, not dollars. If rates climb 3% a year, the same panels save more every year — and the later years carry most of the return. It is also the part of the forecast you control least, so it is worth testing a lower figure.
What about panel degradation?
Panels lose roughly 0.5% of output a year, so a 25-year-old system produces around 85–88% of its original power. This model holds production flat, which slightly flatters long horizons — a conservative kWh figure offsets it.
Does solar add to my home's value?
Owned systems generally do; leased systems can complicate a sale because the contract has to transfer. That resale value is not counted here, so a purchased system's true return is somewhat better than the payback figure alone suggests.
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Disclaimer: DayCents provides this calculator for educational purposes only. Results are estimates based on your inputs and the stated assumptions — they are not financial advice, a quote, or an offer of credit. Consult a qualified financial professional before making major money decisions.