Geração diária (kWh)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
kW × HSP × eff
About this calculator
The Daily Solar Generation (kWh) calculator estimates energy produced daily by a photovoltaic system. It uses three key values: system power in kilowatts (kWp), Solar Peak Hours (HSP) for your region, and system efficiency. The result, a kilowatt-hour (kWh) estimate, is useful for planning installations or assessing energy savings.
The formula used is **kWp × HSP × efficiency**. HSP represents daily average irradiance converted to equivalent hours of sunlight in your area. Efficiency accounts for losses from shading, temperature, and dirt. For example, a 5 kWp system in a region with 4 HSP and 80% efficiency produces about 16 kWh/day (5 × 4 × 0.8 = 16).
Use this tool during installation planning, battery sizing, or comparing solar technologies. Note that real-world generation may vary due to weather, panel tilt, and equipment quality. This is an idealized estimate and does not replace detailed technical analysis by solar system specialists.
Important: HSP values depend on latitude and panel orientation, while efficiency excludes inverter or wiring losses. For higher accuracy, consult a solar engineering expert, especially in regions with significant seasonal variation.
Frequently asked questions
What are HSP and how do I find values for my region?
HSP (Solar Peak Hours) are equivalent daily sunlight hours. Official irradiation maps from INMET or ABRAPEL tools provide regional HSP data.
How does panel tilt affect calculated generation?
Optimal tilt maximizes HSP, but this calculation assumes ideal orientation. Poor tilt reduces actual output.
Does system efficiency already include inverter losses?
No, efficiency factors in shading, temperature, and dust losses. Add 5-10% extra for inverter and wiring losses.
Can I use this tool for grid-tied systems?
Yes, for sizing. For off-grid systems, include battery calculations and storage losses.
Why do results vary by season?
HSP change with solar seasons and local weather. Use annual averages for realistic projections.