Peak sun hours in Minnesota
Minnesota averages 4.2 peak sun hours a day across the year, 34th of the 50 states. At that figure a 400-watt panel produces about 1.29 kWh a day after real-world losses, and covering the 900 kWh average US bill takes about 23 panels. Minneapolis, the state's biggest city, runs slightly ahead of the statewide figure at 4.3 hours; treat 4.2 as the midpoint of a real spread rather than a local reading.
modest sun: 4.2 of a possible ~6.5 hours
Panel counts for Minnesota bills
Computed at Minnesota's 4.2 hours with 400W panels and the 0.77 derate; the US-average column shows what the same bill takes at 4.5 hours, so you can see what your state's sun is worth in hardware.
| Monthly usage | Minnesota | System size | US average |
|---|---|---|---|
| 500 kWh/mo | 13 panels | 5.2 kW | 12 panels |
| 750 kWh/mo | 20 panels | 8 kW | 18 panels |
| 900 kWh/mo | 23 panels | 9.2 kW | 22 panels |
| 1,000 kWh/mo | 26 panels | 10.4 kW | 24 panels |
| 1,500 kWh/mo | 39 panels | 15.6 kW | 36 panels |
| 2,000 kWh/mo | 51 panels | 20.4 kW | 48 panels |
What 4.2 hours means in practice
Minnesota runs 7% below the national solar average, 34th of 50 at 4.2 hours. That is workable sun, not bad sun: the 900 kWh bill takes 23 panels here versus 22 nationally, 1 more. Germany built the world's densest solar fleet on worse.
How a Minnesota year is shaped
The 4.2-hour figure is an annual average, and no month is average. These are the twelve monthly means for Minnesota from NASA's 2001-2020 solar climatology, each as a share of the state's own annual mean, with that share applied to the 4.2-hour planning figure. July and December are marked.
| Month | Share of the annual average | Peak sun hours (est.) |
|---|---|---|
| January | 45% | 1.9 |
| February | 75% | 3.1 |
| March | 99% | 4.1 |
| April | 124% | 5.2 |
| May | 143% | 6.0 |
| June | 158% | 6.6 |
| July | 166% | 7.0 |
| August | 139% | 5.8 |
| September | 106% | 4.4 |
| October | 68% | 2.9 |
| November | 44% | 1.8 |
| December | 33% | 1.4 |
Minnesota's light is front-loaded into summer. July holds 166% of the annual average against December's 33%, 5.1 to one, and the four strongest months carry 50% of the year. Read across the table: 7.0 hours a day in July, about 1.4 in December. The annual average is honest arithmetic and thin planning, because most of the energy shows up in the months you need heating least.
Half the Minnesota calendar sits above the annual average and half below: April through September are the six months that beat it, carrying 70% of the year's light. April is already worth about 5.2 hours a day, so the productive half of the year starts earlier than most people expect.
Worth pinning to a real bill: EIA's 2024 average for a Minnesota household was 712 kWh a month, 17% under the national figure, which is 19 panels at Minnesota's annual sun. Sized instead for December it takes 56 panels, 2.9 times as many. The gap between those two numbers is what a grid connection is worth.
The state average also hides a real geographic split. Sampling 20 grid cells across Minnesota, the southwest comes out 16% sunnier than the northeast: call it 4.5 hours against 3.9 once it is scaled to the 4.2-hour statewide figure. That is larger than the gap between many neighbouring states in the ranking.
What that sun is worth on a Minnesota bill
| EIA, 2024 residential averages | Minnesota | United States |
|---|---|---|
| Average home's monthly use | 712 kWh | 863 kWh |
| Price per kilowatt-hour | 15.45¢ | 16.48¢ |
| Average monthly bill | $110.06 | $142.26 |
| One 400W panel, a year's output | 472 kWh | 506 kWh |
| What that output displaces | $73 | $83 |
At 15.45¢ a kilowatt-hour Minnesota sits 6% below the national 16.48¢, 19th of the fifty states on price. One 400-watt panel offsets roughly $73 of Minnesota power a year. Mid-table on rates means the project lives or dies on the quote and the net-metering terms rather than on either the sun or the tariff.
Rank Minnesota by what a panel earns rather than by sunlight and it moves up 4 places, from 34th to 30th. Rates do that. Rhode Island gets less sun (4.1 hours to Minnesota's 4.2) and pays 28.65¢ against 15.45¢, so one panel is worth about $59 less a year in Minnesota than in Rhode Island.
Two warnings on those dollar figures. They are displaced electricity and nothing else: no install cost, no incentive, no financing, and no assumption about how your utility settles a surplus, which is the single biggest unknown in the sum. And a state average hides the utility you are actually on; 15.45¢ is every Minnesota residential customer averaged together, and neighbouring territories can differ by more than the gap between two states in the ranking.
Getting a number for your address
For a location-exact figure, run your address through NREL's free PVWatts; it uses measured weather for your grid cell and will also model roof tilt and direction, which statewide numbers cannot. Then compare its annual kWh against a quote's promise before you sign anything.
Questions people ask
How many solar panels do I need in Minnesota?
About 23 400-watt panels (9.2 kW) for the 900 kWh a month an average US home uses, at Minnesota's 4.2 peak sun hours. For the average Minnesota home specifically, which EIA measured at 712 kWh a month in 2024, it is 19. Your own bill is the variable that matters, and the calculator takes any figure.
Is 4.2 peak sun hours good for solar?
It is below the 4.5-hour national average but far from disqualifying. Panel counts run about 7% higher here for the same bill, and the December trough measured above deserves respect in any off-grid plan. Grid-tied systems ride through it on net metering.
How much is one solar panel worth a year in Minnesota?
About $73. One 400-watt panel at Minnesota's 4.2 peak sun hours makes roughly 472 kWh a year after the 0.77 derate, and Minnesota residential electricity averaged 15.45¢ a kilowatt-hour in 2024 (EIA), which puts Minnesota 30th of the 50 states on this measure against 34th on sunlight alone. That figure is displaced electricity only. It says nothing about install cost, incentives, or how your utility settles a surplus.
Do peak sun hours change with the seasons in Minnesota?
Yes, by a factor of 5.1 here. NASA's 2001-2020 climatology puts Minnesota's July at 166% of the annual average and December at 33%, so the 4.2-hour figure on this page is the midpoint of a curve running from roughly 7.0 hours a day down to 1.4. Grid-tied homes bank the summer surplus as credit; off-grid designs have to size for the trough, and in Minnesota that means 56 panels for an average local bill instead of 19.