Solar BR Média
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The Solar BR Average calculator estimates solar radiation available for photovoltaic energy generation in Brazil, using the national average of ~5 kWh/m²/day. It relies on historical solar irradiance data and factors like regional climate, roof tilt, and orientation. Ideal for calculating the necessary power of solar systems, especially in high-sunlight regions.
It works by multiplying the available area (in m²) by the average irradiance of 5 kWh/m²/day, adjusted for panel efficiency (typically 15-20%). Example: 10 m² × 5 kWh/m²/day × 20% = 1 kWh/day. These calculations help size systems for homes, businesses, or industries.
Use this tool for projects in regions with variable climates or when local-specific data isn't available. Avoid using it in areas with continuous shading or during planning stages without engineering review. Always combine with on-site measurements for accuracy.
Note: the national average (~5 kWh/m²/day) may not reflect local conditions. Coastal or high-altitude regions require adjustments. Consult INMET regional tables or specialized companies for critical calculations.
Frequently asked questions
Why use the national average of 5 kWh/m²/day?
To simplify calculations in regions without detailed data. Specific regions may have different values, such as the Cerrado (6-7 kWh/m²/day) or Northeast (5-6 kWh/m²/day).
How does this tool help residential projects?
It calculates the power needed to meet average energy demand, considering the home's daily consumption and panel efficiency.
Do I need additional information besides the available area?
Yes: roof tilt, orientation (north/south), shading, and local climate conditions can alter final results.
When should I consult a professional?
Always for precision, such as in commercial projects or when factors like tree shadows or nearby buildings are relevant.
How to account for panel efficiency?
Multiply the average irradiance by panel efficiency (15-20%) to estimate daily energy generated per m².