All systems show a bimodal distribution at highly variable days at high-frequency, but this bimodality is lost when considering the 15-minute averages. Cloud and albedo enhanceent impacts on solar irradiance using high-frequency measurements from thermopile and photodiode radiometers.
Fig. A1. Probability density (area) and kernel density estimate (line) of PV household (left), PV inverter limited (center) and SME PV (right) at high frequency (top) and 15 min average (bottom). All systems show a bimodal distribution at highly variable days at high-frequency, but this bimodality is lost when considering the 15-minute averages.
High-frequency fluctuations of PV power output are mainly driven by fluctuations of irradiance.
For the inverter limited household PV system distinct plateaus of high values in the high-resolution yield data are observed at 3.2 and 3.0 kW. A time window with two of these steps in detail is shown in Fig. 2.
However, variability of solar energy due to cloud shading occurs at very short timescales, in the order of 1 s (Lohmann and Monahan 2018). Considering the typically used, coarser timescales
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