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  •  weather:
    •  Wind speed below 5 m/s
    •  Less than 10% of sky are covered by clouds. If a cloud casts shadow on parts of the solar field during the drone flight, the flight has to be repeated some 10-15 minutes after the cloud has left
    •  The weather is clear and sunny, no clouds, with irradiance (plane of array POA) > 650 W/m2
  •  solar field:
    •  The solar field has to be in full operation, make sure there is no clipping in any part of the solar field at the time of flight.
      Defects can only be detected by thermography for operational modules. All other modules will be shown as “open circuit”
    •  Solar field is clean. Solar field cleanliness > 0.97 (less than 3% soiling losses)  
    •  Only for tracking PV field:
      •  make sure to complete your flights within no more than 2 hours before or after solar noon.
      •  all modules must be at the same tracking angle. modules with tracking angles diverting from the nominal value cannot be evaluated
  •  There should be no No shadowing of adjacent rows during flights - especially in winter!

Drone:

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