Savings and payback, 60 tools

What will solar actually save you?

Start from your utility rate, your usage, or how you plan to pay for the system. These tools turn your numbers into a payback timeline and a real savings figure, not just a rough guess.

Start here

The tool most people run first

Solar savings calculator by utility rate Your actual bill savings, built from your real utility rate. The starting point for every other tool on this page.

Payback basics

Start with the fundamentals

Every savings figure on this page starts with the size of the system behind it. The solar panel calculator turns your monthly usage into a kilowatt target you can bring to the tools below.

Payback period calculator Break even timeline estimator Lifetime savings, 25 year Lifetime savings, 30 year Monthly bill reduction estimator Annual bill reduction estimator Quick 2 minute payback estimator

Rate structure and usage

How you're billed changes the math

Your utility rate is the single biggest driver of payback, and rates vary widely by state. The US Energy Information Administration's electricity data show how retail rates have moved, which is the starting point for any savings estimate here.

Solar savings by utility rate Flat rate vs tiered rate savings Time of use rate savings Peak shaving savings estimator Savings with battery vs without Savings with EV charging included Savings for high usage homes Savings for low usage homes Payback period by region

Financial analysis

Look at it the way a lender or accountant would

ROI percentage calculator Simple vs discounted payback Net present value calculator Internal rate of return calculator Cost per kWh produced Levelized cost of energy After tax savings calculator Pre tax vs post tax savings

Rate inflation and projections

Project savings forward as utility rates rise

Savings vs rate inflation projection Rate increase sensitivity Savings at 3% rate inflation Savings at 5% rate inflation Savings at 7% rate inflation Cumulative savings graph generator Year by year savings breakdown

Per-unit savings and home value

Break savings down to a single panel, kW, or resale dollar

Savings per panel calculator Savings per kW installed Home value increase from solar Resale payback recapture

Financing comparison

Cash, loan, lease, or PPA change your payback shape

Paying cash, borrowing, leasing, or signing a PPA each bend the payback curve differently. The loan payment calculator shows the monthly payment behind the financed path, so you can compare it with the cash figures above.

Cash vs loan savings comparison Cash vs lease savings comparison Loan vs PPA savings comparison

Incentives

See the difference the federal tax credit makes

The 30% federal residential credit ended for systems placed in service after December 31, 2025. The IRS page on the residential clean energy credit states the current rules and the placed-in-service cutoff, so check it before you count on any credit in your math.

Savings with ITC applied Savings without ITC applied

Seasonal and usage-level

Savings by season and by how much power you use

Seasonal savings variation Winter vs summer savings Savings for 2,000 kWh a month Savings for 1,000 kWh a month Savings for 500 kWh a month

Bill mechanics

The line-item details behind your monthly bill

Bill offset percentage calculator Zero dollar bill calculator Negative credit rollover calculator Annual true-up payment estimator

Real-world adjustments

Account for degradation, shading, and estimate accuracy

Savings loss from degradation Savings with shading loss included Real vs estimated savings gap

Snapshots and ownership costs

Quick answers and the full cost-of-ownership picture

First year savings, quick calc 10 year savings snapshot Savings with maintenance costs Savings with inverter replacement cost Total cost of ownership calculator Solar vs no solar, 25 year Savings for rental property owners Savings for a second home

Questions

Frequently asked

Most homeowners save between $1,000 and $2,000 a year, depending on their utility rate, system size, and how much of their usage the system offsets. The solar savings calculator uses your real rate to give you a specific number instead of a national average.

Typical payback runs 6 to 12 years, depending on system cost, incentives, and your electricity rate. The payback period calculator and break even timeline estimator both work from your own numbers to give you a specific timeline.

Yes. Paying cash produces the highest lifetime savings, while a loan or lease trades a slower payback for little or no upfront cost. Compare the paths directly with the cash vs loan tool or the loan vs PPA tool.

Several do. The rate inflation projection tool and the rate sensitivity calculator both let you model how a rising utility rate increases your savings over the life of the system.