Solar panels in Trenton, NJ
Roofs in Trenton get about 1,420 hours of usable sunlight a year — less than 73% 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 Trenton → City averages are a starting point; your own roof's size, pitch and shading change the answer a lot.
What a typical Trenton solar system costs
A 23-panel system (9.2 kW) is about right for an average Trenton home using 10,800 kWh a year. It would produce roughly 11,104 kWh annually and offset 100% of that usage.
| System | Size | kWh/yr | Net cost | Saves/yr | Payback |
|---|---|---|---|---|---|
| 8 panels | 3.2 kW | 3,862 | $6,384 | $749 | 8.5 yrs |
| 12 panels | 4.8 kW | 5,794 | $9,576 | $1,124 | 8.5 yrs |
| 16 panels | 6.4 kW | 7,725 | $12,768 | $1,499 | 8.5 yrs |
| 20 panels | 8 kW | 9,656 | $15,960 | $1,873 | 8.5 yrs |
| 26 panels | 10.4 kW | 12,553 | $20,748 | $2,180 | 9.5 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 Trenton gets 1,420 sun hours
That figure comes from Google's analysis of real rooftops across Trenton — 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 Trenton reaches about 1,529 hours, roughly 8% better than typical.
The numbers behind this page
| Typical usable sunlight | 1,420 hrs/yr |
|---|---|
| Unshaded roof | 1,529 hrs/yr |
| Electricity rate (New Jersey avg) | 19.4¢/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 | 13 |
| Google imagery from | 2023 |
Nearby cities
See all of New Jersey → statewide sunlight, rates, incentives and every city we've measured.
Trenton solar questions
How many solar panels do I need in Trenton?
About 23 panels for an average home. Trenton roofs get 1,420 usable sun hours a year, so each 400W panel produces roughly 483 kWh annually.
Is solar worth it in Trenton?
At 19.4¢/kWh and 1,420 sun hours, a typical system pays for itself in about 8.7 years and returns roughly $34,395 over 25 years. That is a solid return.
How much do solar panels cost in Trenton?
A 9.2 kW system costs about $26,220 before incentives and $18,354 after the 30% federal tax credit. Prices vary by installer, roof complexity and equipment.
Worth reading before you buy
Estimates only, generated 2026-08-22 from Google Solar API rooftop samples and average New Jersey 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.