Note: This calculator provides approximate results based on average data. The actual solar panel needs may vary based on multiple factors. Always consult with a professional before making decisions.
Estimated Requirements
System Size (Total Capacity):
kWp
Number of Solar Panels Needed:
panels
Estimated Annual Production:
kWh/year
Area Required:
m²
Benefits of Solar Panels
- Lower Energy Bills: Significant reduction in monthly electricity costs.
- Environmental Impact: Reduces carbon footprint and greenhouse gas emissions.
- Energy Independence: Less reliance on the grid and energy price fluctuations.
- Long Lifespan: Modern panels last 25-30 years with minimal degradation.
- Low Maintenance: Requires minimal upkeep, typically just occasional cleaning.
- Potential Incentives: Government rebates and tax benefits in many regions.
Additional Parameters
How It Works (Calculation Details)
This calculator estimates your solar panel requirements based on several key parameters:
| Parameter | Description | Impact on Calculations |
|---|---|---|
| Monthly Consumption | Your average monthly electricity usage in kilowatt-hours (kWh). | Higher consumption requires more solar panels and larger system size. |
| Location (Solar Irradiance) | The amount of sunlight your area receives, measured in kWh/m²/day. | Areas with higher solar irradiance require fewer panels for the same output. |
| Roof Space | Available area for solar panel installation in square meters. | Limits the maximum number of panels that can be installed. |
| Self-Sufficiency Level | The percentage of your electricity needs you want to cover with solar. | Higher self-sufficiency requires more panels but provides greater independence. |
| Panel Efficiency | How effectively the panel converts sunlight to electricity. | Higher efficiency panels produce more power per square meter but may cost more. |
| Roof Angle/Tilt | The angle of your roof surface relative to horizontal. | Optimal tilt angles (typically 30-40° in most regions) maximize production. |
| Roof Orientation | The direction your roof faces (compass direction). | South-facing roofs (in Northern Hemisphere) receive the most sunlight. |
| Shading Conditions | The amount of shade your roof receives throughout the day. | Shading significantly reduces solar panel output and efficiency. |
Calculation Factors and Assumptions:
- Average solar panel size in 2025: approximately 400-450 watts per panel.
- System losses (wiring, inverter efficiency, etc.): approximately 14-20%.
- Average panel dimensions: approximately 1.7 m² per panel.
- Annual degradation rate: approximately 0.5% per year (industry standard for quality panels).
- Performance ratio: 0.75-0.85 (accounts for various system losses and real-world conditions).
The calculator uses these factors to estimate the system size in kilowatt peak (kWp), the number of panels needed, and the roof area required for installation.