Solar panels in Olathe, KS
Roofs in Olathe get about 1,579 hours of usable sunlight a year — more than 55% 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 Olathe → City averages are a starting point; your own roof's size, pitch and shading change the answer a lot.
What a typical Olathe solar system costs
A 21-panel system (8.4 kW) is about right for an average Olathe home using 10,800 kWh a year. It would produce roughly 11,274 kWh annually and offset 100% of that usage.
| System | Size | kWh/yr | Net cost | Saves/yr | Payback |
|---|---|---|---|---|---|
| 8 panels | 3.2 kW | 4,295 | $6,384 | $606 | 10.5 yrs |
| 12 panels | 4.8 kW | 6,442 | $9,576 | $908 | 10.5 yrs |
| 16 panels | 6.4 kW | 8,590 | $12,768 | $1,211 | 10.5 yrs |
| 20 panels | 8 kW | 10,737 | $15,960 | $1,514 | 10.5 yrs |
| 26 panels | 10.4 kW | 13,958 | $20,748 | $1,634 | 12.7 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 Olathe gets 1,579 sun hours
That figure comes from Google's analysis of real rooftops across Olathe — 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 Olathe reaches about 1,705 hours, roughly 8% better than typical.
The numbers behind this page
| Typical usable sunlight | 1,579 hrs/yr |
|---|---|
| Unshaded roof | 1,705 hrs/yr |
| Electricity rate (Kansas avg) | 14.1¢/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 Kansas → statewide sunlight, rates, incentives and every city we've measured.
Olathe solar questions
How many solar panels do I need in Olathe?
About 21 panels for an average home. Olathe roofs get 1,579 usable sun hours a year, so each 400W panel produces roughly 537 kWh annually.
Is solar worth it in Olathe?
At 14.1¢/kWh and 1,579 sun hours, a typical system pays for itself in about 10.9 years and returns roughly $21,730 over 25 years. That is slower than the national average, so compare quotes carefully.
How much do solar panels cost in Olathe?
A 8.4 kW system costs about $23,940 before incentives and $16,758 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 Kansas 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.