Solar Radiation & PV Calculator

Check current solar irradiance at your location and calculate estimated energy production from your photovoltaic panels.

Current Status

Night

Solar Radiation

0
W/m²
Total Radiation
0
W/m²
Direct
0
W/m²
Diffuse
Data source: MET Norway (estimated) | Updated: 2026-01-10T05:00:00Z

7-Day Forecast

Sat, Jan 10
Sunshine: 3 h
2.1
MJ/m²
Sun, Jan 11
Sunshine: 2.7 h
1.9
MJ/m²
Mon, Jan 12
Sunshine: 4.7 h
3.3
MJ/m²
Tue, Jan 13
Sunshine: 5.2 h
3.6
MJ/m²
Wed, Jan 14
Sunshine: 3.7 h
2.6
MJ/m²
Thu, Jan 15
Sunshine: 2.5 h
1.8
MJ/m²
Fri, Jan 16
Sunshine: 4.1 h
2.9
MJ/m²

Solar Panel Production Calculator

Location
Warszawa
52.23°N
21.01°E

Enter your photovoltaic system parameters to calculate estimated daily and weekly energy production based on current solar radiation data.

Typical home system: 3-10 kWp
Cells cut in half - panel works as two independent systems. Shading one half doesn't affect the other.
0%
No shade Heavy shading
35°
Optimal: equal to your latitude
180° S
N
S
E
W
180° = South (optimal)
Current electricity rate in your tariff
Estimated Daily Production
-- kWh
≈ -- USD

7-Day Forecast

Calculating...

Historical Data (Previous Year) PVGIS

Fill in your system parameters to see estimated production based on real satellite data from previous years.

Solar Radiation Information

Solar radiation is electromagnetic energy emitted by the Sun. It is measured in watts per square meter (W/m²).

  • Total Radiation (Shortwave): Sum of direct and diffuse solar radiation reaching the surface.
  • Direct Radiation: Radiation arriving directly from the Sun without scattering.
  • Diffuse Radiation: Radiation scattered by the atmosphere.
  • DNI (Direct Normal Irradiance): Direct radiation measured on a surface perpendicular to the sun's rays.

Radiation Levels:

  • 0-100 W/m²: Very low (night/heavy clouds)
  • 100-300 W/m²: Low (cloudy)
  • 300-600 W/m²: Moderate (partly cloudy)
  • 600-800 W/m²: Good (mostly sunny)
  • 800+ W/m²: Excellent (clear sky)

Why Use Our Calculator?

Real-time Data

We use current solar radiation data, not historical averages.

Accurate Calculations

We factor in tilt angle, azimuth, and panel efficiency in calculations.

7-Day Forecast

Plan your energy usage with a week-long production forecast.

Frequently Asked Questions

How accurate is the solar calculator?
The calculator uses real-time solar radiation data and accounts for panel tilt and orientation. Accuracy is approximately 85-90% compared to actual production.

What is the optimal panel tilt angle?
The optimal tilt angle equals your latitude. For maximum annual production, panels should be tilted at an angle matching your geographic latitude.

Does panel orientation matter?
Yes, orientation (azimuth) significantly affects production. South-facing panels (180°) produce the most energy. A 45° deviation reduces production by about 5%.

Where does the radiation data come from?
Data comes from OpenWeatherMap and the Norwegian Meteorological Institute (MET Norway), providing current satellite measurements and forecasts.
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