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P50-P90 Probabilistic Production


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I have two questions regarding this tool:

1) I have uncertainty data for different PV component losses like LID, mismatch losses, efficiency etc. How do I combine them into a single uncertainty for 'PV module models and parameters' in the PVsyst P50-P90 tool?

2) In the FAQ section it mentions that the different uncertainties are added together quadratically. What is the equation? Since the production is more sensitive to certain inputs like Meteo data than others I assume there is different weighting given to different uncertainties i.e. soiling, inverters, PV components etc.

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