Solar panels in Rochester, MN
Roofs in Rochester get about 1,522 hours of usable sunlight a year — more than 53% 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 Rochester → City averages are a starting point; your own roof's size, pitch and shading change the answer a lot.
What a typical Rochester solar system costs
A 21-panel system (8.4 kW) is about right for an average Rochester home using 10,800 kWh a year. It would produce roughly 10,867 kWh annually and offset 100% of that usage.
| System | Size | kWh/yr | Net cost | Saves/yr | Payback |
|---|---|---|---|---|---|
| 8 panels | 3.2 kW | 4,140 | $6,384 | $613 | 10.4 yrs |
| 12 panels | 4.8 kW | 6,210 | $9,576 | $919 | 10.4 yrs |
| 16 panels | 6.4 kW | 8,280 | $12,768 | $1,225 | 10.4 yrs |
| 20 panels | 8 kW | 10,350 | $15,960 | $1,532 | 10.4 yrs |
| 26 panels | 10.4 kW | 13,454 | $20,748 | $1,697 | 12.2 yrs |
How we worked this out for Rochester
Every number on this page comes from these seven steps. Nothing is a national average — the sunlight figure is measured from Rochester rooftops.
| # | Step | Result |
|---|---|---|
| 1 | What one panel makes here 400W ÷ 1000 × 1,522 sun hrs × 0.85 system losses |
517 kWh/yr |
| 2 | Panels needed to cover typical usage 10,800 kWh ÷ 517 kWh per panel |
21 panels |
| 3 | System size 21 panels × 400W |
8.40 kW |
| 4 | Annual production 8.40 kW × 1,522 hrs × 0.85 |
10,867 kWh/yr |
| 5 | Installed cost 8,400 W × $2.85 per watt, then −30% federal credit |
$16,758 |
| 6 | Annual saving 3,780 kWh used as generated × 14.8¢ + 7,087 kWh exported × 14.8¢ |
$1,601/yr |
| 7 | Payback $16,758 ÷ $1,601 per year |
10.5 years |
Step 6 matters more than it looks. Only 35% of what a system this size produces in Rochester is used the moment it is generated; the other 7,087 kWh is exported and credited one-for-one under net metering. Because exports here are credited at or near retail, that split changes the payback very little — 10.4 years against the 10.5 we show. In places where exports pay a fraction of retail the same split moves payback by years, which is why we model it explicitly rather than assuming.
Assumptions: 400W panels, 15% system losses (inverter, wiring, heat, soiling), $2.85/W installed, 10,800 kWh typical annual household use, 14.8¢/kWh electricity. Change any of those and every figure above moves — which is exactly why a single national "solar costs X" number is misleading.
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 Rochester gets 1,522 sun hours
That figure comes from Google's analysis of real rooftops across Rochester — 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 Rochester reaches about 1,574 hours, roughly 3% better than typical.
The numbers behind this page
| Typical usable sunlight | 1,522 hrs/yr |
|---|---|
| Unshaded roof | 1,574 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 | 14 |
| Google imagery from | 2022 |
When Rochester actually produces
Annual totals hide the thing that catches people out: 38% of Rochester's yearly sunlight arrives in May–July, and just 12% across November–January.
| Month | Sun hrs | Share of year |
|---|---|---|
| Jan | 60 | |
| Feb | 86 | |
| Mar | 121 | |
| Apr | 159 | |
| May | 186 | |
| Jun | 198 | |
| Jul | 192 | |
| Aug | 169 | |
| Sep | 134 | |
| Oct | 96 | |
| Nov | 66 | |
| Dec | 53 |
Rochester 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 Rochester's latitude, not separately measured, so treat the monthly figures as the shape of a typical year rather than a forecast.
How Rochester compares to the other 788 cities
| Measure | Rochester | Rank of 788 |
|---|---|---|
| Usable sunlight | 1,522 hrs | 366th |
| Sunlight lost to shade | 3% | 600th most |
| Median roof size | 248 m² | 215th largest |
| Electricity rate | 14.8¢ | 514th highest |
| Payback | 10.5 yrs | 372nd fastest |
| Grid carbon | 832 kg/MWh | 85th dirtiest |
What actually stands out about Rochester:
- Plenty of roof to work with. Typical roofs here fit around 93 panels — roughly 4× what an average home needs. Roof size will not be what limits your system in Rochester.
- Every kWh counts more here. The grid serving Rochester emits 832 kg CO₂ per MWh, among the highest of the 788 cities measured — so the same panels displace more emissions than they would elsewhere.
- Sunnier than the rest of Minnesota. Rochester roofs get 7% more usable sunlight than the typical Minnesota city we've measured — statewide averages will understate what you can expect here.
Cities with almost the same sunlight
These are the closest matches to Rochester's 1,522 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 |
|---|---|---|---|
| St. Louis, MO | 1,522 | 12.2¢ | 12.7 yrs |
| La Crosse, WI | 1,522 | 17.3¢ | 9 yrs |
| Elgin, IL | 1,521 | 16.3¢ | 9.5 yrs |
| Quincy, MA | 1,521 | 30.1¢ | 5.1 yrs |
Nearby cities
See all of Minnesota → statewide sunlight, rates, incentives and every city we've measured.
Rochester solar questions
How many solar panels do I need in Rochester?
About 21 panels for an average home using 10,800 kWh a year. Rochester roofs get 1,522 usable sun hours, so each 400W panel produces roughly 517 kWh annually. A typical Rochester roof fits about 93 panels, so roof space is unlikely to be your limit.
Is solar worth it in Rochester?
At 14.8¢/kWh and 1,522 sun hours, a typical system pays for itself in about 10.5 years and returns roughly $23,264 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 Rochester?
A 8.4 kW system costs about $23,940 before incentives and $16,758 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.