Solar panels in Fairfield, CA

Q: How many solar panels do I need in Fairfield?

About 17 panels for an average home. Fairfield roofs receive 1,917 usable sun hours per year.

Q: Is solar worth it in Fairfield?

At 31.2 cents per kWh and 1,917 sun hours, a typical system pays back in about 8.3 years.

Roofs in Fairfield get about 1,917 hours of usable sunlight a year — more than 88% of the cities we've measured. Here's what that means in cost, savings and payback, using real rooftop data rather than a national average.

1,917Sun hours / yr

17Panels typical

$13,566Cost after credit

8.3 yrPayback

Solar is reasonable in Fairfield, not spectacular. A 8.3-year payback still beats most savings accounts over the panel's 25-year life, but it is not the slam dunk you'll see advertised.

California no longer pays full price for exported power. Under net billing, power you send to the grid earns about 20% of what you pay to buy it back, rather than the one-for-one credit older net metering gave. Because a system without a battery exports most of what it makes, this lengthens payback substantially — and it is why our figures here are lower than calculators still assuming one-for-one credit. A battery raises the share you use yourself and shortens payback, at the cost of adding $8,000–15,000 to the system.

Check your specific roof in Fairfield → City averages are a starting point; your own roof's size, pitch and shading change the answer a lot.

What a typical Fairfield solar system costs

A 17-panel system (6.8 kW) is about right for an average Fairfield home using 10,800 kWh a year. It would produce roughly 11,080 kWh annually and offset 100% of that usage.

Estimated economics by system size in Fairfield, at 31.2¢/kWh after the 30% federal tax credit
System	Size	kWh/yr	Net cost	Saves/yr	Payback
8 panels	3.2 kW	5,214	$6,384	$1,269	5 yrs
12 panels	4.8 kW	7,821	$9,576	$1,432	6.7 yrs
16 panels	6.4 kW	10,428	$12,768	$1,594	8 yrs
20 panels	8 kW	13,036	$15,960	$1,757	9.1 yrs
26 panels	10.4 kW	16,946	$20,748	$2,001	10.4 yrs

Notice that payback barely improves as systems get bigger, and eventually gets worse. That's because you can only save money on electricity you were going to buy anyway. Once a system covers your usage, extra panels mostly generate exports at a much lower rate.

Why Fairfield gets 1,917 sun hours

That figure comes from Google's analysis of real rooftops across Fairfield — it already accounts for shading from trees, chimneys and neighbouring buildings, which is why it's lower than the raw "hours of daylight" figures you'll see elsewhere. An unusually open, unshaded roof in Fairfield reaches about 1,981 hours, roughly 3% better than typical.

The numbers behind this page

Typical usable sunlight	1,917 hrs/yr
Unshaded roof	1,981 hrs/yr
Electricity rate (California avg)	31.2¢/kWh
Installed cost assumed	$2.85/W
Panel size assumed	400 W
Federal tax credit	30%
Typical household usage	10,800 kWh/yr
Power used as generated	34%
Paid for exported power	20% of retail
Rooftops sampled here	8
Google imagery from	2024

Nearby cities

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See all of California → statewide sunlight, rates, incentives and every city we've measured.

Fairfield solar questions

How many solar panels do I need in Fairfield?

About 17 panels for an average home. Fairfield roofs get 1,917 usable sun hours a year, so each 400W panel produces roughly 652 kWh annually.

Is solar worth it in Fairfield?

At 31.2¢/kWh and 1,917 sun hours, a typical system pays for itself in about 8.3 years and returns roughly $27,306 over 25 years. That is a solid return.

How much do solar panels cost in Fairfield?

A 6.8 kW system costs about $19,380 before incentives and $13,566 after the 30% federal tax credit. Prices vary by installer, roof complexity and equipment.

Worth reading before you buy

What your utility pays for exportsChanges payback more than any equipment choice 12 questions to ask before signingIdentical systems vary 30–40% in price South or west facing roof?Guide Is my roof any good for solar?Guide

Estimates only, generated 2026-08-22 from Google Solar API rooftop samples and average California electricity rates. Not a quote and not financial advice. Your roof, usage, utility plan and local incentives will change these numbers — get real quotes before buying.