Solar panels in Eau Claire, WI
Roofs in Eau Claire get about 1,492 hours of usable sunlight a year — less than 52% 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 Eau Claire → City averages are a starting point; your own roof's size, pitch and shading change the answer a lot.
What a typical Eau Claire solar system costs
A 22-panel system (8.8 kW) is about right for an average Eau Claire home using 10,800 kWh a year. It would produce roughly 11,160 kWh annually and offset 100% of that usage.
| System | Size | kWh/yr | Net cost | Saves/yr | Payback |
|---|---|---|---|---|---|
| 8 panels | 3.2 kW | 4,058 | $6,384 | $702 | 9.1 yrs |
| 12 panels | 4.8 kW | 6,087 | $9,576 | $1,053 | 9.1 yrs |
| 16 panels | 6.4 kW | 8,116 | $12,768 | $1,404 | 9.1 yrs |
| 20 panels | 8 kW | 10,146 | $15,960 | $1,755 | 9.1 yrs |
| 26 panels | 10.4 kW | 13,189 | $20,748 | $1,972 | 10.5 yrs |
How we worked this out for Eau Claire
Every number on this page comes from these seven steps. Nothing is a national average — the sunlight figure is measured from Eau Claire rooftops.
| # | Step | Result |
|---|---|---|
| 1 | What one panel makes here 400W ÷ 1000 × 1,492 sun hrs × 0.85 system losses |
507 kWh/yr |
| 2 | Panels needed to cover typical usage 10,800 kWh ÷ 507 kWh per panel |
22 panels |
| 3 | System size 22 panels × 400W |
8.80 kW |
| 4 | Annual production 8.80 kW × 1,492 hrs × 0.85 |
11,160 kWh/yr |
| 5 | Installed cost 8,800 W × $2.85 per watt, then −30% federal credit |
$17,556 |
| 6 | Annual saving 3,780 kWh used as generated × 17.3¢ + 7,380 kWh exported × 17.3¢ |
$1,884/yr |
| 7 | Payback $17,556 ÷ $1,884 per year |
9.3 years |
Step 6 matters more than it looks. Only 34% of what a system this size produces in Eau Claire is used the moment it is generated; the other 7,380 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 — 9.1 years against the 9.3 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, 17.3¢/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 Eau Claire gets 1,492 sun hours
That figure comes from Google's analysis of real rooftops across Eau Claire — 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 Eau Claire reaches about 1,581 hours, roughly 6% better than typical.
The numbers behind this page
| Typical usable sunlight | 1,492 hrs/yr |
|---|---|
| Unshaded roof | 1,581 hrs/yr |
| Electricity rate (Wisconsin avg) | 17.3¢/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 | 9 |
| Google imagery from | 2022 |
When Eau Claire actually produces
Annual totals hide the thing that catches people out: 38% of Eau Claire's yearly sunlight arrives in May–July, and just 12% across November–January.
| Month | Sun hrs | Share of year |
|---|---|---|
| Jan | 58 | |
| Feb | 83 | |
| Mar | 118 | |
| Apr | 156 | |
| May | 184 | |
| Jun | 196 | |
| Jul | 190 | |
| Aug | 167 | |
| Sep | 132 | |
| Oct | 93 | |
| Nov | 64 | |
| Dec | 51 |
Eau Claire produces about 3.9× 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 Eau Claire's latitude, not separately measured, so treat the monthly figures as the shape of a typical year rather than a forecast.
How Eau Claire compares to the other 788 cities
| Measure | Eau Claire | Rank of 788 |
|---|---|---|
| Usable sunlight | 1,492 hrs | 406th |
| Sunlight lost to shade | 6% | 346th most |
| Median roof size | 335 m² | 75th largest |
| Electricity rate | 17.3¢ | 316th highest |
| Payback | 9.3 yrs | 284th fastest |
| Grid carbon | 832 kg/MWh | 106th dirtiest |
What actually stands out about Eau Claire:
- Plenty of roof to work with. Typical roofs here fit around 111 panels — roughly 5× what an average home needs. Roof size will not be what limits your system in Eau Claire.
- Large roofs. At a median of 335 m², Eau Claire has the 75th-largest typical roof footprint we've measured.
- Every kWh counts more here. The grid serving Eau Claire 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.
Cities with almost the same sunlight
These are the closest matches to Eau Claire's 1,492 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 |
|---|---|---|---|
| Aurora, IL | 1,493 | 16.3¢ | 9.9 yrs |
| New York, NY | 1,488 | 24.3¢ | 6.6 yrs |
| Lexington, KY | 1,496 | 12.2¢ | 13.2 yrs |
| Decatur, IL | 1,497 | 16.3¢ | 9.9 yrs |
Nearby cities
See all of Wisconsin → statewide sunlight, rates, incentives and every city we've measured.
Eau Claire solar questions
How many solar panels do I need in Eau Claire?
About 22 panels for an average home using 10,800 kWh a year. Eau Claire roofs get 1,492 usable sun hours, so each 400W panel produces roughly 507 kWh annually. A typical Eau Claire roof fits about 111 panels, so roof space is unlikely to be your limit.
Is solar worth it in Eau Claire?
At 17.3¢/kWh and 1,492 sun hours, a typical system pays for itself in about 9.3 years and returns roughly $29,543 over a 25-year panel life. That is a solid return, and it improves further if electricity prices rise. Exported power earns full retail credit here.
How much do solar panels cost in Eau Claire?
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 Wisconsin 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.