.jpg)
How Much Solar Power Can You Install on a 100m² Roof?
- kelly6822
- Apr 25
- 2 min read
If you’re thinking about installing solar panels in Canada, one of the first questions you might have is:“How much solar power can I generate with 100 square meters of roof space?”
The answer depends on several factors—but in general, a 100m² roof can support a powerful, cost-effective solar system. Let’s break it down.
1. Panel Size and Efficiency
Most residential solar panels are around 1.7 m² in size (typically 1m x 1.7m) and generate 350W to 450W per panel depending on the brand and technology.That means:
100 m² ÷ 1.7 m² ≈ 58 panels
58 panels x 400W = 23.2 kW of potential system capacity
This is considered a large residential or small commercial system in Canada.
2. Realistic Usable Space
Not all of your roof will be usable—chimneys, skylights, pitch, and shading all reduce the available area.Most professional installers assume 75–85% of the roof is usable, giving you:
Usable area: ~75–85 m²
Estimated system size: 15 to 20 kW
This can still produce more than enough energy to power a full home, small business, or charge an EV.
3. Estimated Annual Production (in Canada)
Based on data from Natural Resources Canada, average annual solar production is about:
1,200 – 1,400 kWh per kW (depending on location)
A 15 kW system can produce 18,000 – 21,000 kWh per year
That’s enough to cover or exceed the average Canadian household’s electricity usage.
4. System Cost and Return on Investment
According to EnergyHub, the average installation cost in Canada is $3.34 per watt before incentives.
A 15 kW system = ~$50,000
Federal programs like the Canada Greener Homes Loan offer interest-free loans up to $40,000
Additional provincial rebates may apply depending on your region
5. Other Considerations
Roof orientation and tilt affect output
Microinverters or optimizers help maximize energy from partially shaded roofs
Battery storage can store extra energy for nighttime or power outages
Net metering lets you send excess power to the grid and earn credits
Conclusion: High Solar Potential on 100m² Roof
A 100m² roof offers a great opportunity to generate clean, renewable energy. With today’s technology and incentives, it’s easier than ever to turn your rooftop into a high-performing solar energy system.
Solar System Estimates for a 100m² Roof:
System Size (kW) | Estimated Panels (#) | Annual Output (kWh) | Approx. Cost ($CAD) | Roof Area Needed (m²) |
10 | 25 | 13000 | 33400 | 42.5 |
15 | 38 | 19500 | 50100 | 64.6 |
20 | 50 | 26000 | 66800 | 85.0 |
23 | 58 | 29900 | 76820 | 98.6 |
Here is a visual chart showing the estimated annual energy output (in kWh) based on different solar system sizes for a 100m² roof. Let me know if you’d like additional charts, such as cost comparisons or roof space utilization!
Comments