Solar panels in Mankato, MN
Roofs in Mankato get about 1,461 hours of usable sunlight a year — less than 66% 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 Mankato → City averages are a starting point; your own roof's size, pitch and shading change the answer a lot.
What a typical Mankato solar system costs
A 22-panel system (8.8 kW) is about right for an average Mankato home using 10,800 kWh a year. It would produce roughly 10,928 kWh annually and offset 100% of that usage.
| System | Size | kWh/yr | Net cost | Saves/yr | Payback |
|---|---|---|---|---|---|
| 8 panels | 3.2 kW | 3,974 | $6,384 | $588 | 10.9 yrs |
| 12 panels | 4.8 kW | 5,961 | $9,576 | $882 | 10.9 yrs |
| 16 panels | 6.4 kW | 7,948 | $12,768 | $1,176 | 10.9 yrs |
| 20 panels | 8 kW | 9,935 | $15,960 | $1,470 | 10.9 yrs |
| 26 panels | 10.4 kW | 12,915 | $20,748 | $1,677 | 12.4 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 Mankato gets 1,461 sun hours
That figure comes from Google's analysis of real rooftops across Mankato — 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 Mankato reaches about 1,605 hours, roughly 10% better than typical.
The numbers behind this page
| Typical usable sunlight | 1,461 hrs/yr |
|---|---|
| Unshaded roof | 1,605 hrs/yr |
| Electricity rate (Minnesota avg) | 14.8¢/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 | 35% |
| Paid for exported power | full retail (net metering) |
| Rooftops sampled here | 8 |
| Google imagery from | 2014 |
When Mankato actually produces
Annual totals hide the thing that catches people out: 38% of Mankato's yearly sunlight arrives in May–July, and just 12% across November–January.
| Month | Sun hrs | Share of year |
|---|---|---|
| Jan | 58 | |
| Feb | 83 | |
| Mar | 116 | |
| Apr | 152 | |
| May | 179 | |
| Jun | 190 | |
| Jul | 185 | |
| Aug | 163 | |
| Sep | 129 | |
| Oct | 92 | |
| Nov | 63 | |
| Dec | 51 |
Mankato produces about 3.7× 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 Mankato's latitude, not separately measured, so treat the monthly figures as the shape of a typical year rather than a forecast.
How Mankato compares to the other 673 cities
| Measure | Mankato | Rank of 673 |
|---|---|---|
| Usable sunlight | 1,461 hrs | 445th |
| Sunlight lost to shade | 9% | 107th most |
| Median roof size | 205 m² | 341st largest |
| Electricity rate | 14.8¢ | 424th highest |
| Payback | 11 yrs | 422nd fastest |
| Grid carbon | 832 kg/MWh | 110th dirtiest |
What actually stands out about Mankato:
- Older imagery. Google's aerial capture of Mankato dates from 2014. Tree growth and new construction since then are not reflected.
Cities with almost the same sunlight
These are the closest matches to Mankato's 1,461 usable sun hours from other states and provinces. Same sunlight, different electricity prices — which is usually what decides whether solar is worth it.
| City | Sun hrs | Rate | Payback |
|---|---|---|---|
| Cincinnati, OH | 1,461 | 15.2¢ | 10.7 yrs |
| Cumberland, MD | 1,462 | 18.3¢ | 8.9 yrs |
| Dover, DE | 1,462 | 17.2¢ | 9.4 yrs |
| Detroit, MI | 1,459 | 19.1¢ | 8.5 yrs |
Nearby cities
See all of Minnesota → statewide sunlight, rates, incentives and every city we've measured.
Mankato solar questions
How many solar panels do I need in Mankato?
About 22 panels for an average home using 10,800 kWh a year. Mankato roofs get 1,461 usable sun hours, so each 400W panel produces roughly 497 kWh annually. A typical Mankato roof fits about 76 panels, so roof space is unlikely to be your limit.
Is solar worth it in Mankato?
At 14.8¢/kWh and 1,461 sun hours, a typical system pays for itself in about 11 years and returns roughly $22,523 over a 25-year panel life. That is slower than average, so compare several quotes before committing. Exported power earns full retail credit here.
How much do solar panels cost in Mankato?
A 8.8 kW system costs about $25,080 before incentives and $17,556 after the 30% federal tax credit. That works out near $2.85 per watt installed. Roof pitch, shading, electrical panel upgrades and equipment choice move the price most, which is why quotes for the same house can differ by thousands.
Worth reading before you buy
Estimates only, generated 2026-08-22 from Google Solar API rooftop samples and average Minnesota 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.