P50 -P90 probabilities

[Aparna]

Hi,

I am a new user of PVsyst software. I would like to know how one can find the P90 value for a particular P50 simulation result in PVsyst 5.68. Is this provision available in this version of PVsyst? Does PVsyst help documentation describe how to manually calculate the same?

Thanks and regards,

Aparna

[André Mermoud]

Please see the Description of the P50-P90 treatment in the FAQ.

This new tool was developed in the version 6.11. It is not available in versions 5.

[vivekjk]

Hi Andre,

We are Owner's Engineers to a client setting up a 20MW solar PV power plant in India.

We have always considered the default PVsyst energy report as equivalent to P-50 estimation. We have now been asked to furnish evidence in support. Is there any available literature or description in PVsyst which says the default energy simulation is P-50 value?

Regards

Vivek Jayakumar

[Bruno Wittmer]

To be able to interpret the simulation output as P50 value, one has to use an average over many years as meteorological input, not the data of a specific year.

The PVsyst default is to use Meteonorm data, which is indeed an average over many years.

If you use a different meteorological source, make sure it represent the average climate of the geographical location, like for example data sets with a Typical Meteorological Year (TMY).

NB: PVsyst also allows to use a shift for taking the climate change into account. We observe - at least in Europe - a significant increase of the annual irradiation (of the order of 5%) with respect to the end of the last century.

See What is the reliability and unceretainties of meteo data ? in our FAQ