.OND files in default database

[Niels]

What is the source of the .ond files in the pvsyst database? are these made by pvsyst or the manufacturers?

For a project I have the following 3 .OND files

2019 .OND name implies version 6.8 in pvsyst

2022 .OND by default in the pvsyst database

2023 .OND received directly from the manufacturer

 

My problem is that the 2019 and 2023 are the exact same, both versions have the same values and ignore stuff such as maximum current mppt.

Meanwhile the one in the pvsyst database as an incorrect current which when used would lead to weird capping losses.

Are the .OND files in the database made by pvsyst themselves? 

[jaymegibson]

Quote

 

On Posted April 17, 2024, Geometry Dash said:

What is the source of the .ond files in the pvsyst database? are these made by pvsyst or the manufacturers?

For a project I have the following 3 .OND files

2019 .OND name implies version 6.8 in pvsyst

2022 .OND by default in the pvsyst database

2023 .OND received directly from the manufacturer

 

My problem is that the 2019 and 2023 are the exact same, both versions have the same values and ignore stuff such as maximum current mppt.

Meanwhile the one in the pvsyst database as an incorrect current which when used would lead to weird capping losses.

Are the .OND files in the database made by pvsyst themselves? 

 

The 2022 file in your database having an incorrect current is likely due to how PVsyst interprets unspecified parameters.If a manufacturer provides a datasheet but leaves the Maximum Input Current blank or ambiguous, PVsyst might calculate it using a default formula:

I_{max} = Pnom,DC / Vmin,Pnom

If the manufacturer's datasheet and the PVsyst-calculated value don't align, you get the weird capping losses clipping you are seeing.

[André Mermoud]

This parameter  "Maximum current per MPPT" is indeed quite correlated to the "Minimum voltage for attaining PNom".  See the help   https://www.pvsyst.com/help/component-database/grid-inverters/grid-inverters-main-interface/grid-inverters-main-parameters/index.html#input-side-dc-pv-array

Now if this is specified, PVsyst will apply this cutrremt limit during the simulation. But this rarely produces "Inverter losses due to current overload", as this limit is most of the time preceded (masked) by the Power overload limit. See the Help   https://www.pvsyst.com/help/physical-models-used/grid-inverter/inverter-operating-limits.html

If the limit is not specified, it is obviously not applied. 

Now this limit is not always well "understood" by the manufacturers who submit their data, nor well defined in the datasheets. Sometimes we have to add this information afterwards in the database.