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Weather Data

Many workflows (e.g. Heat Demand Analysis & Photovoltaic Potential Analysis) require weather data for an accurate simulation.

Required data

The most basic information that is required for simulation are measured monthly values of:

Global Horizontal Irradiance (GHI)

Total irradiance from the sun on a horizontal surface on Earth.

Monthly average, in W/m².

Ambient temperature

Air temperature ~2m above the ground.

Monthly average, in °C.

Those monthly values can then be used to calculate other irradiances (e.g. DHI, DNI), if needed with a finer time step.

Sources

The currently available methods for data import in WeatherProcessor are:

  • Monthly global horizontal irradiance and ambient temperature from PVGIS online database.
  • Monthly global horizontal irradiance and ambient temperature from INSEL offline database.
  • Hourly global horizontal irradiance and ambient temperature from local TMY3 file.
  • Monthly global horizontal irradiance and ambient temperature from local TMY3 file.

Optional data

  • Sky temperature
  • Diffuse Horizontal Irradiance (DHI).
  • Direct Normal Irradiance (DNI).
  • Global Irradiance in Plane of Array

Algorithms

Hourly irradiance values

Diffuse horizontal irradiance

Sky temperature