15 minutes intervals simulation results

[Devajt]

Hello,

I would like to ask, since I know it's not possible to do it for now, are you planning to add i some time possibility to simulate results in 15 minutes intervals, not only in hourly system like right now we have? If yes, then when we could expect to see it implemented in PVSyst, more or less at least?

I'm asking mostly in terms of hourly data we can generate in csv. file but of course also about basic reports. We are getting more and more questions regarding this topic from our clients and banks when looking for proper financing for our projects and it would be good to know if there is something we can hope for in the future. 

[Linda Thoren]

Hello,

Indeed the PVsyst simulation is hourly based, so any sub-hourly phenomenon has to be averaged. This includes the weather data or self-consumption.

The main reason for this limitation is that we currently consider that Perez’s transposition model is not well calibrated for sub-hourly data (EUPVSEC 2023).

Sub-hourly simulation should be available in PVSyst 8.1, but the release date is not yet defined (it will be after 2025).

Nonetheless, we included a sub-hourly clipping correction in PVsyst 8.0, allowing the simulation to consider sub-hourly irradiance fluctuation for clipping (EUPVSEC 2024)

You can refer to the dedicated section in our help page for more information.

The last option is to use the so-called pseudo-subhourly simulation. The idea is to run n hourly simulations (in your case n = 60min/15min -> 4 ) then recombine the results.

You can find a PDF tutorial about the whole process in our website: pseudo sub-hourly simulation

This process can even be automated if you have a PVsyst CLI licence. You can find an application of pseudo-subhourly simulation using PVsyst CLI in python in the help

Please note that pseudo sub-hourly simulation cannot be used with energy storage systems.

Best regards,