Solar panels in London, ON

Q: How many solar panels do I need in London?

About 23 panels for an average home. London roofs receive 1,389 usable sun hours per year.

Q: Is solar worth it in London?

At 15.2 cents per kWh and 1,389 sun hours, a typical system pays back in about 15.9 years.

Q: How much do solar panels cost in London?

A 9.2 kW system costs about CA$26,220 before incentives.

Roofs in London get about 1,389 hours of usable sunlight a year — less than 82% 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.

1,389Sun hours / yr

23Panels typical

CA$26,220Cost after credit

15.9 yrPayback

Be careful in London. At a 15.9-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 London → City averages are a starting point; your own roof's size, pitch and shading change the answer a lot.

What a typical London solar system costs

A 23-panel system (9.2 kW) is about right for an average London home using 10,800 kWh a year. It would produce roughly 10,862 kWh annually and offset 100% of that usage.

Estimated economics by system size in London, at 15.2¢/kWh
System	Size	kWh/yr	Net cost	Saves/yr	Payback
8 panels	3.2 kW	3,778	CA$9,120	CA$574	15.9 yrs
12 panels	4.8 kW	5,667	CA$13,680	CA$861	15.9 yrs
16 panels	6.4 kW	7,556	CA$18,240	CA$1,149	15.9 yrs
20 panels	8 kW	9,445	CA$22,800	CA$1,436	15.9 yrs
26 panels	10.4 kW	12,279	CA$29,640	CA$1,698	17.5 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 London gets 1,389 sun hours

That figure comes from Google's analysis of real rooftops across London — 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 London reaches about 1,475 hours, roughly 6% better than typical.

The numbers behind this page

Typical usable sunlight	1,389 hrs/yr
Unshaded roof	1,475 hrs/yr
Electricity rate (Ontario avg)	15.2¢/kWh
Installed cost assumed	$2.85/W
Panel size assumed	400 W
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	2023

Nearby cities

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

London solar questions

How many solar panels do I need in London?

About 23 panels for an average home. London roofs get 1,389 usable sun hours a year, so each 400W panel produces roughly 472 kWh annually.

Is solar worth it in London?

At 15.2¢/kWh and 1,389 sun hours, a typical system pays for itself in about 15.9 years and returns roughly CA$14,879 over 25 years. That is slower than the national average, so compare quotes carefully.

How much do solar panels cost in London?

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 a battery worth it?Guide How long do panels last?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.