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SOLAR

Solar Payback Period Calculator

Estimate how many years a solar installation takes to pay for itself with its annual electricity savings.

JOB INPUTS

Enter your numbers

Loading saved values

Total installed cost before credits

$
Total installed cost before credits

Estimated annual electricity savings

$
Estimated annual electricity savings

Tax credits, rebates and incentives (0 if none)

$
Tax credits, rebates and incentives (0 if none)
Results update automatically
CALCULATED RESULTUSD
Payback period8.2 years
Net cost$14,700.00
Annual savings$1,800.00
Incentives / credits$6,300.00
Payback in years8.2 yrs
FORMULA USED$21,000.00 − $6,300.00 = $14,700.00 ÷ $1,800.00 = 8.2 years

HOW TO USE IT

How to use the Solar Payback Period Calculator

  1. 1

    Enter the total installed system cost.

  2. 2

    Set your estimated annual electricity savings.

  3. 3

    Add tax credits, rebates and incentives (0 if none).

  4. 4

    Review your payback period in years.

THE MATH

Solar payback formula

Payback (years) = (system cost − incentives) ÷ annual savings

Net cost is the installed price minus incentives. Dividing net cost by annual savings gives the number of years to break even.

PRACTICAL EXAMPLE

A $21,000 system saving $1,800 per year

With the 30% federal credit ($6,300), net cost drops to $14,700. Divided by $1,800 in annual savings, payback is about 8.2 years.

FAQ

Frequently asked questions

What is the average payback period?

Nationally it averages 6 to 9 years for homes, ranging from about 5 years in high-rate, sunny states to over 10 in lower-rate markets. It is highly regional.

Do incentives count?

Yes. The 30% federal credit, state rebates and net metering can shorten payback by several years.