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Solar Payback Calculator

Estimate net upfront cost, first-year savings, and recovery timeline using just your zip code and monthly electric bill.

U.S.-focused assumptionsEditable calculator inputsPlanning estimate only

Your Home Details

Enter your average monthly electric bill or utility usage to generate an instant solar estimate. Add your zip code when you want localized assumptions.

How this works

Enter your monthly bill or utility usage and we will estimate system size, installation cost, and first-year savings automatically. Zip code is optional and only localizes the rate and production assumptions.

Live resultsZIP optional

Ready for your estimate

Enter your monthly bill or utility usage to generate live results.

Start with your average monthly bill or utility-usage data. Add your zip code any time to replace the fallback electricity-rate assumption with localized data.

Planning note

Enter your monthly bill or utility usage first. Zip code stays optional and only localizes the estimate.

Methodology and assumptions

What drives the estimate

  • Results are estimates for U.S. homeowners based on the numbers you enter.
  • Utility prices can change over time and may rise faster or slower than the default inflation rate.
  • The prior 30% federal residential clean energy credit applied to eligible solar property placed in service from 2022 through 2025; current 2026 planning defaults federal solar credits to $0 unless you enter a confirmed incentive.
  • State and utility incentives vary and are not automatically customized by location in this version.
  • Maintenance, financing, and roof work are not included in this simple model.
  • We automatically estimate your system size using your local electricity rate, local solar irradiance, and a declining cost per watt curve for installation.
  • Federal solar credits are not prefilled for current 2026 planning. Enter a confirmed federal, state, utility, or installer incentive if it applies to your project.

FAQ

What is simple payback?

Simple payback is the number of years it takes for estimated bill savings to offset your upfront solar investment.

Does this include financing costs?

No. This version models direct cost, incentives, and bill savings only.

Review assumptions and sources

Public-value guide

Use this calculator with a quote, a bill example, or a threshold check

The calculator is the math layer. These three reads help you use it more safely when you are normalizing installer proposals, calibrating expectations from a familiar bill, or deciding whether your current bill is even worth modeling further.

Quote normalization

When two installers show different payback numbers, rerun both quotes with the same bill, incentive treatment, export assumption, and years-in-home horizon before trusting either headline claim.

How To Compare Solar Quotes Using One Payback Model

Worked bill example

A familiar electric bill can still lead to a conservative payback that is much longer than an installer deck implies. Use a worked example first so your expectations are anchored before you compare local quotes.

Solar Payback Example in 2026: What Happens With a $180 Electric Bill?

Threshold check

One magic monthly-bill threshold is not enough. Local electricity rate, export value, battery decisions, quote price, and ownership horizon can move the outcome more than the headline bill amount.

What Electric Bill Makes Solar Worth It? A Safer Way To Think About the ThresholdReview assumptions and sources