Solar panels in Stockton, CA

Roofs in Stockton get about 1,879 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.

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

What a typical Stockton solar system costs

A 17-panel system (6.8 kW) is about right for an average Stockton home using 10,800 kWh a year. It would produce roughly 10,861 kWh annually and offset 100% of that usage.

How we worked this out for Stockton

Every number on this page comes from these seven steps. Nothing is a national average — the sunlight figure is measured from Stockton rooftops.

Step 6 is where most calculators quietly overstate things. Only 35% of what a system this size produces in Stockton is used the moment it is generated; the other 7,081 kWh is exported and credited at 20% of retail under net billing. Valuing every kWh at the full 31.2¢ retail rate — which many calculators do — would show a payback of 4.0 years instead of the 8.4 we show. That 4.4-year difference is the single biggest reason our figures look worse than other sites' for Stockton.

Assumptions: 400W panels, 15% system losses (inverter, wiring, heat, soiling), $2.85/W installed, 10,800 kWh typical annual household use, 31.2¢/kWh electricity. Change any of those and every figure above moves — which is exactly why a single national "solar costs X" number is misleading.

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 Stockton gets 1,879 sun hours

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

The numbers behind this page

When Stockton actually produces

Annual totals hide the thing that catches people out: 35% of Stockton's yearly sunlight arrives in May–July, and just 14% across November–January.

Stockton produces about 2.8× as much in Jun as in Dec — a normal mid-latitude swing. Expect real winter shortfall and summer surplus rather than steady year-round output.

The annual total is measured from Google's rooftop imagery. Its split across months is calculated from solar geometry at Stockton's latitude, not separately measured, so treat the monthly figures as the shape of a typical year rather than a forecast.

How Stockton compares to the other 788 cities

What actually stands out about Stockton:

• Plenty of roof to work with. Typical roofs here fit around 116 panels — roughly 6× what an average home needs. Roof size will not be what limits your system in Stockton.
• Large roofs. At a median of 346 m², Stockton has the 62nd-largest typical roof footprint we've measured.
• Expensive electricity works in your favour. At 31.2¢/kWh, California is among the priciest places to buy power — which is exactly what makes generating your own pay back faster.

Cities with almost the same sunlight

These are the closest matches to Stockton's 1,879 usable sun hours from other states and provinces. Same sunlight, different electricity prices — which is usually what decides whether solar is worth it.

Nearby cities

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

Stockton solar questions

Worth reading before you buy

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.