Solar potential

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Under solar potential is defined as the short-wave solar radiation enjoyment an area taking into account exposure, inclination and shade in the far range (relief) and short range (vegetation, buildings).

Important steps in the calculation include:

  • Determination of the position of the sun depending on the year and time for the given geographical longitude and latitude,
  • Calculation of the deviation of the solar radiation from the surface normal of a house roof,
  • Calculation of shading by surrounding objects or distant topography using suitable ray tracing methods (direct sunlight),
  • Determination of the size of the effective sky surface for the determination of the diffuse sky radiation (depending on the one hand on the orientation of the roof surface, on the other hand on the horizon elevation due to the surrounding topography),
  • Calculation of the total shading by superposition of the individual shading results (direct and diffuse).

Integration in solar cadastre

The solar potential is usually given in the unit kWh / m² and the observation period (e.g. year, months, ...), calculated on the basis of high-resolution digital surface models from airborne laser scanning data and reproduced as a map in a solar cadastre . The cadastre shows how much usable solar radiation hits a building roof or an open area. Solar cadastre are often made publicly available to citizens via web portals. The street and house number can be entered and a digital map will be loaded which shows the building's solar potential in color.

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