Why should the length of a shadow be considered while identifying PV array location?

The size of a shadow depends on:

  • size of the object
  • location of the object
  • date and time

Taking these into account, the length of a shadow should be estimated accurately when designing a solar system so that row spacing between solar PV modules can be properly decided. Keeping in mind that the sun travels in an arch, therefore both the sun’s altitude (position) and the azimuth must be considered when determining the length of a shadow.

A representation of the sun’s position on 21 June and 21 December


21 June @ 5:00 pm

21 December @5:00 pm










These images are comparison of spatial distribution and the course of shading over time on 21 June and 21 December at 5:00 pm

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