Solar panels in Modesto, CA

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

About 17 panels for an average home. Modesto roofs receive 1,900 usable sun hours per year.

Q: Is solar worth it in Modesto?

At 31.2 cents per kWh and 1,900 sun hours, a typical system pays back in about 8.3 years.

Roofs in Modesto get about 1,900 hours of usable sunlight a year — more than 89% 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.

1,900Sun hours / yr

17Panels typical

$13,566Cost after credit

8.3 yrPayback

Solar is reasonable in Modesto, 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 Modesto → City averages are a starting point; your own roof's size, pitch and shading change the answer a lot.

What a typical Modesto solar system costs

A 17-panel system (6.8 kW) is about right for an average Modesto home using 10,800 kWh a year. It would produce roughly 10,982 kWh annually and offset 100% of that usage.

Estimated economics by system size in Modesto, at 31.2¢/kWh after the 30% federal tax credit
System	Size	kWh/yr	Net cost	Saves/yr	Payback
8 panels	3.2 kW	5,168	$6,384	$1,266	5 yrs
12 panels	4.8 kW	7,752	$9,576	$1,427	6.7 yrs
16 panels	6.4 kW	10,336	$12,768	$1,588	8 yrs
20 panels	8 kW	12,920	$15,960	$1,750	9.1 yrs
26 panels	10.4 kW	16,796	$20,748	$1,992	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 Modesto gets 1,900 sun hours

That figure comes from Google's analysis of real rooftops across Modesto — 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 Modesto reaches about 1,945 hours, roughly 2% better than typical.

The numbers behind this page

Typical usable sunlight	1,900 hrs/yr
Unshaded roof	1,945 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	13
Google imagery from	2024

Nearby cities

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

Modesto solar questions

How many solar panels do I need in Modesto?

About 17 panels for an average home. Modesto roofs get 1,900 usable sun hours a year, so each 400W panel produces roughly 646 kWh annually.

Is solar worth it in Modesto?

At 31.2¢/kWh and 1,900 sun hours, a typical system pays for itself in about 8.3 years and returns roughly $27,153 over 25 years. That is a solid return.

How much do solar panels cost in Modesto?

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 Do panels work in winter?Guide How many panels do I need?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.