Solar panels in Watertown, NY
Roofs in Watertown get about 1,435 hours of usable sunlight a year — less than 72% 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 Watertown → City averages are a starting point; your own roof's size, pitch and shading change the answer a lot.
What a typical Watertown solar system costs
A 23-panel system (9.2 kW) is about right for an average Watertown home using 10,800 kWh a year. It would produce roughly 11,222 kWh annually and offset 100% of that usage.
| System | Size | kWh/yr | Net cost | Saves/yr | Payback |
|---|---|---|---|---|---|
| 8 panels | 3.2 kW | 3,903 | $6,384 | $948 | 6.7 yrs |
| 12 panels | 4.8 kW | 5,855 | $9,576 | $1,423 | 6.7 yrs |
| 16 panels | 6.4 kW | 7,806 | $12,768 | $1,897 | 6.7 yrs |
| 20 panels | 8 kW | 9,758 | $15,960 | $2,371 | 6.7 yrs |
| 26 panels | 10.4 kW | 12,685 | $20,748 | $2,739 | 7.6 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 Watertown gets 1,435 sun hours
That figure comes from Google's analysis of real rooftops across Watertown — 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 Watertown reaches about 1,471 hours, roughly 3% better than typical.
The numbers behind this page
| Typical usable sunlight | 1,435 hrs/yr |
|---|---|
| Unshaded roof | 1,471 hrs/yr |
| Electricity rate (New York avg) | 24.3¢/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 | 7 |
| Google imagery from | 2022 |
When Watertown actually produces
Annual totals hide the thing that catches people out: 38% of Watertown's yearly sunlight arrives in May–July, and just 12% across November–January.
| Month | Sun hrs | Share of year |
|---|---|---|
| Jan | 57 | |
| Feb | 81 | |
| Mar | 114 | |
| Apr | 149 | |
| May | 176 | |
| Jun | 186 | |
| Jul | 181 | |
| Aug | 159 | |
| Sep | 127 | |
| Oct | 91 | |
| Nov | 63 | |
| Dec | 50 |
Watertown 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 Watertown's latitude, not separately measured, so treat the monthly figures as the shape of a typical year rather than a forecast.
How Watertown compares to the other 673 cities
| Measure | Watertown | Rank of 673 |
|---|---|---|
| Usable sunlight | 1,435 hrs | 487th |
| Sunlight lost to shade | 2% | 590th most |
| Median roof size | 71 m² | 660th largest |
| Electricity rate | 24.3¢ | 122nd highest |
| Payback | 6.9 yrs | 36th fastest |
| Grid carbon | 464 kg/MWh | 503rd dirtiest |
What actually stands out about Watertown:
- Roof space is the binding constraint. A typical Watertown roof fits about 20 panels and a typical home needs 23 — so there is little room to oversize. If you add an EV or heat pump later, plan the array for it now.
- Small roofs. The median Watertown roof is 71 m², smaller than 98% of cities measured — worth checking your own footprint before assuming a standard system fits.
Cities with almost the same sunlight
These are the closest matches to Watertown's 1,435 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 |
|---|---|---|---|
| Reading, PA | 1,435 | 18.1¢ | 9.3 yrs |
| St. Catharines, ON | 1,434 | 15.2¢ | 15.8 yrs |
| Keene, NH | 1,434 | 25.3¢ | 6.7 yrs |
| Lorain, OH | 1,437 | 15.2¢ | 11.1 yrs |
Nearby cities
See all of New York → statewide sunlight, rates, incentives and every city we've measured.
Watertown solar questions
How many solar panels do I need in Watertown?
About 23 panels for an average home using 10,800 kWh a year. Watertown roofs get 1,435 usable sun hours, so each 400W panel produces roughly 488 kWh annually. A typical Watertown roof fits about 20 panels, so check your usable roof area before assuming that many will fit.
Is solar worth it in Watertown?
At 24.3¢/kWh and 1,435 sun hours, a typical system pays for itself in about 6.9 years and returns roughly $47,896 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 Watertown?
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 New York 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.