Solar Panel Calculator Ontario

Determine the optimal solar panel system size and estimated cost for your Ontario home. This calculator helps you understand solar energy potential, system requirements, and financial benefits based on your electricity usage and location.

How to Use This Calculator

To get accurate results for your Ontario home:

Enter your average monthly electricity usage in kWh
Select your roof type (flat or pitched)
Choose your solar panel efficiency (standard or premium)
Enter the average Ontario solar irradiance (default is 1500 kWh/m²/year)
Click "Calculate" to see your recommended system size and estimated cost

The calculator uses Ontario-specific solar data and average installation costs to provide realistic estimates.

Formula Used

The calculator uses the following formula to determine the recommended solar panel system size:

System Size (kW) = (Monthly Electricity Usage × 12) ÷ (Solar Irradiance × Panel Efficiency × 0.8)

Where:

Monthly Electricity Usage = Your average monthly electricity consumption in kWh
Solar Irradiance = Average solar radiation in Ontario (default 1500 kWh/m²/year)
Panel Efficiency = 15% for standard panels, 18% for premium panels
0.8 = System loss factor accounting for inverter efficiency and other losses

The estimated cost is calculated by multiplying the system size by the average Ontario installation cost of $4.50 per watt.

Worked Example

For a home with 300 kWh monthly electricity usage, flat roof, standard panels, and default solar irradiance:

System Size = (300 × 12) ÷ (1500 × 0.15 × 0.8) = 4.8 kW Estimated Cost = 4.8 × $4.50/W = $21.60

This system would generate approximately 4,800 kWh/year, covering about 16% of your annual electricity needs.

Ontario-Specific Considerations

Ontario has favorable solar conditions with an average solar irradiance of 1500 kWh/m²/year. Key factors to consider:

Solar incentives: Ontario offers the Green Energy Act which provides a 25% rebate on solar installations
Net metering: Excess solar energy can be sold back to the grid at a rate of 10.5 cents/kWh
Roof orientation: South-facing roofs receive the most sunlight
Shading: Trees or nearby buildings can reduce solar potential

Note: Actual savings may vary based on your specific location, roof orientation, and electricity rates. This calculator provides estimates based on average Ontario conditions.

Frequently Asked Questions

How accurate are the solar panel calculator results?

The calculator provides estimates based on average Ontario conditions. For precise results, consult with a local solar installer who can assess your specific roof and shading conditions.

What factors affect solar panel system size?

Key factors include your electricity usage, roof type, panel efficiency, solar irradiance, and potential shading. The calculator accounts for these variables to provide a realistic estimate.

How long does it take to recoup solar panel costs?

Payback periods vary based on electricity rates and incentives. In Ontario, with the 25% rebate and net metering, many homeowners see payback within 5-8 years.