Solar panels in Hillsboro, OR
Roofs in Hillsboro get about 1,317 hours of usable sunlight a year — less than 93% 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 Hillsboro → City averages are a starting point; your own roof's size, pitch and shading change the answer a lot.
What a typical Hillsboro solar system costs
A 25-panel system (10 kW) is about right for an average Hillsboro home using 10,800 kWh a year. It would produce roughly 11,195 kWh annually and offset 100% of that usage.
| System | Size | kWh/yr | Net cost | Saves/yr | Payback |
|---|---|---|---|---|---|
| 8 panels | 3.2 kW | 3,582 | $6,384 | $444 | 14.4 yrs |
| 12 panels | 4.8 kW | 5,373 | $9,576 | $666 | 14.4 yrs |
| 16 panels | 6.4 kW | 7,164 | $12,768 | $888 | 14.4 yrs |
| 20 panels | 8 kW | 8,956 | $15,960 | $1,110 | 14.4 yrs |
| 26 panels | 10.4 kW | 11,642 | $20,748 | $1,365 | 15.2 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 Hillsboro gets 1,317 sun hours
That figure comes from Google's analysis of real rooftops across Hillsboro — 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 Hillsboro reaches about 1,400 hours, roughly 6% better than typical.
The numbers behind this page
| Typical usable sunlight | 1,317 hrs/yr |
|---|---|
| Unshaded roof | 1,400 hrs/yr |
| Electricity rate (Oregon avg) | 12.4¢/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 | full retail (net metering) |
| Rooftops sampled here | 14 |
| Google imagery from | 2022 |
Nearby cities
See all of Oregon → statewide sunlight, rates, incentives and every city we've measured.
Hillsboro solar questions
How many solar panels do I need in Hillsboro?
About 25 panels for an average home. Hillsboro roofs get 1,317 usable sun hours a year, so each 400W panel produces roughly 448 kWh annually.
Is solar worth it in Hillsboro?
At 12.4¢/kWh and 1,317 sun hours, a typical system pays for itself in about 14.8 years and returns roughly $13,836 over 25 years. That is slower than the national average, so compare quotes carefully.
How much do solar panels cost in Hillsboro?
A 10 kW system costs about $28,500 before incentives and $19,950 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 Oregon 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.