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Radiation values not matching course of sun


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I was looking into the syntheticly generated radiation values. I recognized, that irradiation values often start before sun altitude is greater than 0.

Is it possible to fix this issue? The time interval in which the algorithm is distributing the daily irradiaiton sum needs to be matched with the interval in which the sun is actually up.


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  • 4 months later...

This depends on when you evaluate the solar geometry.

In PVsyst, for normal intervals the geometry is computed in the middle of the hour (eventually shifted for some measured data).

Now the first interval of the day begins at the sunrise time (say, 6:20). And the solar geometry is evaluated in the middle of this interval (in this case 6:40).

I don't know whether the Synthetic generation managed by Meteonorm uses this convention. Please ask the Meteonorm team.

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