Solar panels in San Jose, CA
Roofs in San Jose get about 1,810 hours of usable sunlight a year — more than 84% 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 San Jose → City averages are a starting point; your own roof's size, pitch and shading change the answer a lot.
What a typical San Jose solar system costs
A 18-panel system (7.2 kW) is about right for an average San Jose home using 10,800 kWh a year. It would produce roughly 11,077 kWh annually and offset 100% of that usage.
| System | Size | kWh/yr | Net cost | Saves/yr | Payback |
|---|---|---|---|---|---|
| 8 panels | 3.2 kW | 4,923 | $6,384 | $1,251 | 5.1 yrs |
| 12 panels | 4.8 kW | 7,385 | $9,576 | $1,404 | 6.8 yrs |
| 16 panels | 6.4 kW | 9,846 | $12,768 | $1,558 | 8.2 yrs |
| 20 panels | 8 kW | 12,308 | $15,960 | $1,712 | 9.3 yrs |
| 26 panels | 10.4 kW | 16,000 | $20,748 | $1,942 | 10.7 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 San Jose gets 1,810 sun hours
That figure comes from Google's analysis of real rooftops across San Jose — 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 San Jose reaches about 1,936 hours, roughly 7% better than typical.
The numbers behind this page
| Typical usable sunlight | 1,810 hrs/yr |
|---|---|
| Unshaded roof | 1,936 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 | 16 |
| Google imagery from | 2023 |
Nearby cities
See all of California → statewide sunlight, rates, incentives and every city we've measured.
San Jose solar questions
How many solar panels do I need in San Jose?
About 18 panels for an average home. San Jose roofs get 1,810 usable sun hours a year, so each 400W panel produces roughly 615 kWh annually.
Is solar worth it in San Jose?
At 31.2¢/kWh and 1,810 sun hours, a typical system pays for itself in about 8.8 years and returns roughly $26,504 over 25 years. That is a solid return.
How much do solar panels cost in San Jose?
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
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.