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Solar panels in St. Catharines, ON

Roofs in St. Catharines get about 1,434 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.

1,434Sun hours / yr
23Panels typical
CA$26,220Cost after credit
15.8 yrPayback
Be careful in St. Catharines. At a 15.8-year payback, solar here is a long-horizon decision, mostly because electricity is relatively cheap (15.2¢/kWh). It can still make sense if rates rise or you have local incentives — but check the numbers hard before signing.

Check your specific roof in St. Catharines → City averages are a starting point; your own roof's size, pitch and shading change the answer a lot.

What a typical St. Catharines solar system costs

A 23-panel system (9.2 kW) is about right for an average St. Catharines home using 10,800 kWh a year. It would produce roughly 11,214 kWh annually and offset 100% of that usage.

Estimated economics by system size in St. Catharines, at 15.2¢/kWh
SystemSizekWh/yr Net costSaves/yrPayback
8 panels3.2 kW 3,900CA$9,120 CA$593 15.4 yrs
12 panels4.8 kW 5,851CA$13,680 CA$889 15.4 yrs
16 panels6.4 kW 7,801CA$18,240 CA$1,186 15.4 yrs
20 panels8 kW 9,751CA$22,800 CA$1,482 15.4 yrs
26 panels10.4 kW 12,677CA$29,640 CA$1,713 17.3 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 St. Catharines gets 1,434 sun hours

That figure comes from Google's analysis of real rooftops across St. Catharines — 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 St. Catharines reaches about 1,541 hours, roughly 7% better than typical.

The numbers behind this page

Typical usable sunlight1,434 hrs/yr
Unshaded roof1,541 hrs/yr
Electricity rate (Ontario avg)15.2¢/kWh
Installed cost assumed$2.85/W
Panel size assumed400 W
Typical household usage10,800 kWh/yr
Power used as generated34%
Paid for exported powerfull retail (net metering)
Rooftops sampled here9
Google imagery from2018

Nearby cities

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See all of Ontario → statewide sunlight, rates, incentives and every city we've measured.

St. Catharines solar questions

How many solar panels do I need in St. Catharines?

About 23 panels for an average home. St. Catharines roofs get 1,434 usable sun hours a year, so each 400W panel produces roughly 488 kWh annually.

Is solar worth it in St. Catharines?

At 15.2¢/kWh and 1,434 sun hours, a typical system pays for itself in about 15.8 years and returns roughly CA$15,213 over 25 years. That is slower than the national average, so compare quotes carefully.

How much do solar panels cost in St. Catharines?

A 9.2 kW system costs about CA$26,220 before incentives . Prices vary by installer, roof complexity and equipment.

Worth reading before you buy

What your utility pays for exportsChanges payback more than any equipment choice 12 questions to ask before signingIdentical systems vary 30–40% in price Is my roof any good for solar?Guide Is a battery worth it?Guide

Estimates only, generated 2026-08-22 from Google Solar API rooftop samples and average Ontario 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.