I have a dataset for solar output, at day the values are positive but at night the values are 0. When i try the seasonal_decompose() function It gives me the following result:

enter image description here

Im pretty sure the difference between day and night is a seasonality (right?).

This is my code:

result = seasonal_decompose(df1, model='additive',freq=96)

freq = 96 because my data is per 15 minutes.

What does this graphs tell me?

  • $\begingroup$ What solar output variable did you measure? Units of measurement? $\endgroup$ – kjetil b halvorsen Oct 21 '20 at 13:54
  • $\begingroup$ @kjetilbhalvorsen I measured the Solar output in MW $\endgroup$ – jari scholten Oct 25 '20 at 10:20
  • $\begingroup$ And why does it have such an increasing (modulo sesonality) trend over time? Something with the measurement conditions? It looks suspicious! $\endgroup$ – kjetil b halvorsen Oct 25 '20 at 22:35

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