Solar panels in Olathe: what they cost and what they make
A typical Olathe home needs 18 solar panels. They would make about 10,636 kWh a year and cost $19k to $29k before incentives. At today's electricity prices they pay for themselves in about 13.7 yrs.
See panels on your own Olathe roof
Type your address. You get your roof from above, the panels that fit, a month-by-month forecast and a battery test. No phone number.
What solar costs in Olathe
At $3.00 a watt, the median price cash buyers pay nationally, a 7.6 kW system costs about $22,800. Quotes in Olathe will usually fall between $19,000 and $28,500. Complex roofs, main-panel upgrades and financing push prices up.
The 30% federal tax credit no longer applies to systems homeowners buy. This estimate includes no state or utility incentives; check with your utility before you buy.
The number that decides whether solar pays in Olathe is what your utility pays for the power you send back. Under full payback is about 13.7 yrs. Under net billing it is about 22.2 yrs, because only the ~43% of solar a typical home uses as it is made saves the full retail price.
Cash purchase, prices rising 2.5% a year, panels losing 0.5% a year, $25/kW a year for upkeep. No federal credit for homeowner-owned systems.
Every way to pay for a 7.6 kW system in Olathe
Change any number →| Way to pay | Day one | Monthly payment | Monthly net, year 1 | Ahead after 25 years |
|---|---|---|---|---|
| Pay cash Full price on install day | $22,800 | $0 | +$119 | $24k |
| Credit-union loan 8% APR, 20 years, no dealer fee | $0 | $191 | −$72 | $1,200 |
| “1.99%” solar loan 1.99% APR, 25 years, 25% dealer fee | $0 | $121 | −$2 | $11k |
| Lease $115/mo, +2.9%/yr | $0 | $115 | +$20 | $2,100 |
| Power purchase (PPA) 12.9¢/kWh, +2.9%/yr | $0 | $114 | +$20 | $5,600 |
Under net metering, at 15.2¢/kWh rising 2.5% a year. The “1.99%” loan’s $5,700 dealer fee is included in its payments. Lease and PPA prices are typical offers, not quotes.
How much sunshine Olathe gets
kWh per kW, 25° southJul is the best month for solar in Olathe, and Dec the weakest: a Dec day makes 57% of a Jul day. A 6 kW system would make about 493 kWh in Dec and 866 kWh in Jul.
On June 21 the sun rises at 5:54 am and sets at 8:48 pm, 14 hours 54 minutes of daylight. On December 21 it is up from 7:34 am to 5:00 pm, just 9 hours 26 minutes.
Peak sun hours in Olathe, month by month
| Month | Flat ground | Panels at 37° | kWh per kW |
|---|---|---|---|
| Jan | 2.3 | 3.9 | 90 |
| Feb | 3.0 | 4.5 | 96 |
| Mar | 3.9 | 4.9 | 119 |
| Apr | 5.0 | 5.3 | 128 |
| May | 5.7 | 5.4 | 136 |
| Jun | 6.6 | 5.8 | 141 |
| Jul | 6.5 | 5.9 | 144 |
| Aug | 5.7 | 5.8 | 137 |
| Sep | 4.8 | 5.7 | 128 |
| Oct | 3.5 | 5.0 | 114 |
| Nov | 2.5 | 4.2 | 93 |
| Dec | 2.0 | 3.6 | 82 |
| Year | 4.3 | 5.0 | 1,407 |
A peak sun hour is one hour of sunlight at 1,000 W per m². Why sites disagree.
The best angle and direction for panels in Olathe
| Roof faces (6/12 pitch) | Output vs south | kWh per kW |
|---|---|---|
| South | 100% | 1,407 |
| Southeast | 95% | 1,337 |
| Southwest | 95% | 1,337 |
| East | 83% | 1,168 |
| West | 82% | 1,154 |
| North | 60% | 844 |
Face panels south and tilt them 37° for the most energy over a year. East and west roofs keep about 83% of that. A north-facing roof keeps 60%, which is rarely worth the money. Try other angles.
Where the sun goes over Olathe
The noon sun is lower in winter, which is why the best winter tilt (62°) is steeper than the best summer tilt (10°).
Olathe's homes
Olathe has 53,072 households. 74.8% own their home, and 38,872 of those owners live in single-family houses, the kind of home that usually gets rooftop solar.
The median home here was built in 1994. Many roofs that age are due for replacement. Replace the roof first, then add solar: taking panels off and putting them back later costs thousands.
28.2% of homes heat with electricity and 69.9% with gas. If you switch to a heat pump or an electric car, plan for more panels or leave room on the roof.
Source: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates.
If the power goes out in Olathe
Solar panels alone shut off in a blackout. Add a battery and they keep going. One Tesla Powerwall 3 (13.5 kWh) running a fridge, freezer, furnace fan, lights, Wi-Fi, TV and microwave (6.9 kWh a day):
Change the appliances, the battery and the weather in the battery calculator.
Questions people ask about solar in Olathe
How much do solar panels cost in Olathe?
A 7.6 kW system — enough for the average Kansas home — costs about $19,000 to $28,500 before incentives, based on $2.50–$3.75 per watt. The 30% federal credit no longer applies to systems homeowners buy.
How many solar panels does a house in Olathe need?
About 18 panels of 420 watts for a home using 876 kWh a month, the Kansas average. Each kilowatt of panels here makes about 1,407 kWh a year on a south-facing roof.
Is solar worth it in Olathe?
Over 25 years, solar power here costs about 10.9¢ per kWh, against 15.2¢ from the grid today. Payback is about 13.7 yrs if your utility credits exported power at the full retail rate, and 22.2 yrs if it pays about 30% of retail.
How many peak sun hours does Olathe get?
5.0 a day on panels tilted to 37°, and 4.3 on flat ground. The best month is Jul; the weakest is Dec.
What is the best angle for solar panels in Olathe?
37° for the most energy over a year, facing south. 62° is best in winter and 10° in summer. On a normal pitched roof, anything within 15° of 37° gives you about 95% of the maximum.
How long would a home battery last in a Olathe power outage?
A Tesla Powerwall 3 running a fridge, freezer, furnace fan, lights, Wi-Fi, TV and microwave (6.9 kWh a day) lasts about 43 hours with no sun. With 7 kW of solar to recharge it, it gets through a three-day outage even in overcast January.
Solar near Olathe
| City | Miles | kWh per kW | Sun hours |
|---|---|---|---|
| Lenexa, KS | 6 | 1,427 | 5.0 |
| Overland Park, KS | 7 | 1,425 | 5.0 |
| Shawnee, KS | 9 | 1,426 | 5.0 |
| Kansas City, KS | 17 | 1,423 | 5.0 |
| Kansas City, MO | 22 | 1,418 | 4.9 |
Olathe shares a weather-data neighbourhood with Kansas City; their sunshine numbers differ by less than our data can resolve. Housing, prices and outage figures are specific to Olathe.
Cities with the same sunshine as Olathe
These far-away cities get almost exactly as much solar energy per panel.
- College Station, TX 1,427 kWh per kW
- Fayetteville, NC 1,426 kWh per kW
- Columbia, SC 1,432 kWh per kW
Snow: NASA records about 13 cm of snow on the ground here in an average January. Covered panels make little until it slides off, and these figures (like PVWatts') don't subtract that.
Sources: NASA POWER 2001–2020 monthly climatology (grid cell 51 km from Olathe's Census point), our PV model (within 1.6% of NLR PVWatts® on average), U.S. EIA prices and use, U.S. Census 2025 population estimates and ACS 2020–2024. Estimates for an average home, not a site survey. How we calculate.