Solar panels in Portsmouth, OH
Roofs in Portsmouth get about 1,384 hours of usable sunlight a year — less than 84% 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 Portsmouth → City averages are a starting point; your own roof's size, pitch and shading change the answer a lot.
What a typical Portsmouth solar system costs
A 23-panel system (9.2 kW) is about right for an average Portsmouth home using 10,800 kWh a year. It would produce roughly 10,823 kWh annually and offset 100% of that usage.
| System | Size | kWh/yr | Net cost | Saves/yr | Payback |
|---|---|---|---|---|---|
| 8 panels | 3.2 kW | 3,764 | $6,384 | $572 | 11.2 yrs |
| 12 panels | 4.8 kW | 5,647 | $9,576 | $858 | 11.2 yrs |
| 16 panels | 6.4 kW | 7,529 | $12,768 | $1,144 | 11.2 yrs |
| 20 panels | 8 kW | 9,411 | $15,960 | $1,431 | 11.2 yrs |
| 26 panels | 10.4 kW | 12,235 | $20,748 | $1,696 | 12.2 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 Portsmouth gets 1,384 sun hours
That figure comes from Google's analysis of real rooftops across Portsmouth — 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 Portsmouth reaches about 1,530 hours, roughly 11% better than typical.
The numbers behind this page
| Typical usable sunlight | 1,384 hrs/yr |
|---|---|
| Unshaded roof | 1,530 hrs/yr |
| Electricity rate (Ohio avg) | 15.2¢/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 | 11 |
| Google imagery from | 2021 |
When Portsmouth actually produces
Annual totals hide the thing that catches people out: 35% of Portsmouth's yearly sunlight arrives in May–July, and just 14% across November–January.
| Month | Sun hrs | Share of year |
|---|---|---|
| Jan | 64 | |
| Feb | 85 | |
| Mar | 112 | |
| Apr | 140 | |
| May | 160 | |
| Jun | 168 | |
| Jul | 163 | |
| Aug | 148 | |
| Sep | 122 | |
| Oct | 93 | |
| Nov | 69 | |
| Dec | 58 |
Portsmouth produces about 2.9× 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 Portsmouth's latitude, not separately measured, so treat the monthly figures as the shape of a typical year rather than a forecast.
How Portsmouth compares to the other 673 cities
| Measure | Portsmouth | Rank of 673 |
|---|---|---|
| Usable sunlight | 1,384 hrs | 567th |
| Sunlight lost to shade | 10% | 87th most |
| Median roof size | 155 m² | 502nd largest |
| Electricity rate | 15.2¢ | 340th highest |
| Payback | 11.2 yrs | 438th fastest |
| Grid carbon | 883 kg/MWh | 75th dirtiest |
What actually stands out about Portsmouth:
- Every kWh counts more here. The grid serving Portsmouth emits 883 kg CO₂ per MWh, among the highest of the 673 cities measured — so the same panels displace more emissions than they would elsewhere.
- Older imagery. Google's aerial capture of Portsmouth dates from 2021. Tree growth and new construction since then are not reflected.
Cities with almost the same sunlight
These are the closest matches to Portsmouth's 1,384 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 |
|---|---|---|---|
| Montreal, QC | 1,384 | 7.9¢ | 30.7 yrs |
| Laval, QC | 1,385 | 7.9¢ | 30.7 yrs |
| Parkersburg, WV | 1,383 | 14.3¢ | 11.9 yrs |
| Bridgeport, CT | 1,386 | 29.2¢ | 5.8 yrs |
Nearby cities
See all of Ohio → statewide sunlight, rates, incentives and every city we've measured.
Portsmouth solar questions
How many solar panels do I need in Portsmouth?
About 23 panels for an average home using 10,800 kWh a year. Portsmouth roofs get 1,384 usable sun hours, so each 400W panel produces roughly 471 kWh annually. A typical Portsmouth roof fits about 50 panels, so roof space is unlikely to be your limit.
Is solar worth it in Portsmouth?
At 15.2¢/kWh and 1,384 sun hours, a typical system pays for itself in about 11.2 years and returns roughly $22,708 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 Portsmouth?
A 9.2 kW system costs about $26,220 before incentives and $18,354 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 Ohio 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.