How panels reduce your bill
Solar panels turn sunlight into direct current, an inverter converts it to the alternating current your house runs on, and your appliances use that power before they touch anything from the grid. Every kilowatt-hour you generate is a kilowatt-hour you don't buy.
Production and consumption rarely line up minute to minute — panels peak at midday, most households peak in the evening. Three things absorb that mismatch:
- Net metering. Surplus power flows back to the grid and your utility credits your account. Terms vary a lot by state and have been getting less generous.
- A home battery. Stores the midday surplus for the evening instead of exporting it. Adds cost, but shields you from weak export rates and from outages.
- Shifting usage. Running the dishwasher, laundry or EV charger during daylight hours is free savings and costs nothing to implement.
A well-sized residential system typically offsets somewhere between 60% and 100% of annual household consumption. Offsetting far beyond 100% is usually a poor investment, because exported power is credited at a lower rate than power you avoid buying.
What a system costs
Residential solar is priced per watt of installed capacity, and that price bundles panels, inverter, racking, wiring, permits, inspection and labour. As a rough planning figure, most US homeowners see quotes in the $2.50–$3.50 per watt range before incentives.
| Monthly electric bill | Typical system size | Indicative cost before incentives |
|---|---|---|
| Under $100 | 4–5 kW | $12,000 – $17,000 |
| $100 – $150 | 5–7 kW | $15,000 – $24,000 |
| $151 – $250 | 7–10 kW | $21,000 – $34,000 |
| $250 – $400 | 10–14 kW | $30,000 – $48,000 |
| $400+ | 14 kW and up | $42,000 and up |
Indicative ranges for planning only. Your real quote depends on roof complexity, electrical panel upgrades, local labour rates, equipment tier and whether you add storage. Batteries commonly add $10,000–$18,000 before incentives. Full cost breakdown →
Tax credits and incentives
Incentives are where solar economics are won or lost, and they change. The three layers to check for your own address:
- Federal. The residential clean energy credit has historically covered a percentage of the total installed cost as a credit against federal income tax. It is a credit, not a rebate — you need tax liability to use it, though unused amounts have generally carried forward.
- State and utility. Upfront rebates, performance payments, property-tax exemptions and sales-tax exemptions. These vary enormously between neighbouring states.
- Net metering rules. Technically not an incentive, but the export rate your utility pays often moves the payback maths more than any rebate.
Percentages, deadlines and eligibility rules shift with legislation, so treat any figure you read online — including on this page — as a starting point, and confirm the current position with a tax professional before you sign anything. Our guide to how the federal solar tax credit works covers the mechanics and where to verify the current rules.
How long payback takes
Payback is the point where cumulative savings equal what you paid. For most US homes with decent sun and reasonable electricity rates, that lands somewhere in the 7 to 12 year band after incentives. Panels are typically warrantied for around 25 years and keep producing at reduced output well beyond it, so the years after payback are the return.
Four things move that number more than anything else:
- Your electricity rate. Solar competes with what you currently pay. High rates shorten payback dramatically; cheap power lengthens it.
- Sun hours and roof orientation. A south-facing roof at a moderate pitch with no shade is the best case. Heavy shade can halve production — see how to size an array for your roof.
- How you pay. Cash gives the shortest payback. A loan spreads it but adds interest. Leases and power-purchase agreements usually mean no upfront cost — and no tax credit for you, because you don't own the system.
- Rate inflation. If your utility raises prices, your savings grow with them.
When solar is a bad fit
Solar is not right for every house, and a salesperson who tells you otherwise is selling, not advising. Be sceptical if:
- You don't own the property. Panels are a permanent modification and require owner consent — renters can't proceed on their own.
- Your roof is near end of life. Replacing a roof under an existing array means paying to remove and reinstall it. Re-roof first.
- Heavy, permanent shade. Mature trees you won't remove, or a taller neighbouring building, can undermine the economics regardless of panel quality.
- You're moving in a year or two. Solar generally supports resale value, but you probably won't reach payback.
- Your electricity is very cheap. If you're paying well below the national average, the savings side of the equation is small.
What happens after you apply
- You answer a few questionsZIP code, ownership, typical bill, roof sun and how to reach you. About a minute.
- We review your roof and usageSatellite imagery, local sun data and your bill range give us a realistic production estimate — not a generic average.
- You get an estimateExpected production, savings and the incentives that apply at your address, in writing.
- You choose whether to talk to an installerIf the numbers work, we introduce you to vetted installers who serve your area. If they don't, we'll tell you that too.
There is no cost and no obligation at any stage. You can ask us to delete your information at any point — see the Privacy Policy for how.
This page is general educational information about residential solar, not financial, tax or engineering advice. Costs, incentives and utility rules differ by location and change over time. Always confirm figures for your own address and circumstances before committing.