Solar panels in Vallejo, CA

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

About 18 panels for an average home. Vallejo roofs receive 1,865 usable sun hours per year.

Q: Is solar worth it in Vallejo?

At 31.2 cents per kWh and 1,865 sun hours, a typical system pays back in about 8.7 years.

Roofs in Vallejo get about 1,865 hours of usable sunlight a year — more than 85% 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.

1,865Sun hours / yr

18Panels typical

$14,364Cost after credit

8.7 yrPayback

Solar is reasonable in Vallejo, not spectacular. A 8.7-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 Vallejo → City averages are a starting point; your own roof's size, pitch and shading change the answer a lot.

What a typical Vallejo solar system costs

A 18-panel system (7.2 kW) is about right for an average Vallejo home using 10,800 kWh a year. It would produce roughly 11,414 kWh annually and offset 100% of that usage.

Estimated economics by system size in Vallejo, at 31.2¢/kWh after the 30% federal tax credit
System	Size	kWh/yr	Net cost	Saves/yr	Payback
8 panels	3.2 kW	5,073	$6,384	$1,260	5.1 yrs
12 panels	4.8 kW	7,609	$9,576	$1,418	6.8 yrs
16 panels	6.4 kW	10,146	$12,768	$1,577	8.1 yrs
20 panels	8 kW	12,682	$15,960	$1,735	9.2 yrs
26 panels	10.4 kW	16,487	$20,748	$1,972	10.5 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 Vallejo gets 1,865 sun hours

That figure comes from Google's analysis of real rooftops across Vallejo — 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 Vallejo reaches about 1,947 hours, roughly 4% better than typical.

The numbers behind this page

Typical usable sunlight	1,865 hrs/yr
Unshaded roof	1,947 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	33%
Paid for exported power	20% of retail
Rooftops sampled here	8
Google imagery from	2023

Nearby cities

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

Vallejo solar questions

How many solar panels do I need in Vallejo?

About 18 panels for an average home. Vallejo roofs get 1,865 usable sun hours a year, so each 400W panel produces roughly 634 kWh annually.

Is solar worth it in Vallejo?

At 31.2¢/kWh and 1,865 sun hours, a typical system pays for itself in about 8.7 years and returns roughly $27,029 over 25 years. That is a solid return.

How much do solar panels cost in Vallejo?

A 7.2 kW system costs about $20,520 before incentives and $14,364 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 What do solar panels cost?Guide South or west facing roof?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.