Linda Thoren

Hello, In the current version you cannot do these manipulations directly in the single line diagram. In the following youtube tutorial you find more information about the single line diagram and the DC and AC cables : The losses in the DC and AC cables can be defined in the detailed losses window as discussed in the following forum posts:

If you have multiple sub-arrays, you can define individual parameters for each sub-array by using the drop down list in the top of the window

For certain scenarios it is not yet implemented, such as for multi orientation daily sharing. In the case in your print screen it is probably because you do not have a multiple between the number of strings and MPPTs in the second sub-array. You should have an orange warning in that sub-array indicating this. You should here create an additional sub-array for the strings of 19 modules, one sub-array with 2 strings and 1 MPPT and a second with 1 string and 1 MPPT. This is further explained in the following youtube video:

Hello, This can be done in the detailed losses window, Ohmic losses tab.

Hello, You can import Measured global on plane (GlPMeas) via the "custom file" tool. You then need to define the Orientation definition and here you can define a tracker. PVsyst will reverse engineer (we use the term reverse-transpose) the GHI and DHI. In the end the discrepancy between the original value and the one in the simulation will differ for a given hour of less than a percent. Over the year the difference should be negligible. You should use the Hay transposition for more robust results with the retro-transposition. This is further explained in the following PVsyst help: https://www.pvsyst.com/help/glossary/solar-geometry/plane-orientation.html

Unfortunately, it’s not possible to import a PVsyst project created in version 8.0.4 into version 7.4.8. PVsyst files are only compatible from lower to higher versions, not the other way around. To open the project, you would need to use PVsyst version 8

Hello, In the current version, PVsyst simulation is hourly based. Thus any sub-hourly phenomenon has to be averaged. Sub-hourly simulation should be available in PVsyst 8.1, but the release date is not yet defined (Normally in the beginning of 2026). Nonetheless, we included a sub-hourly clipping correction in PVsyst 8.0, allowing the simulation to consider sub-hourly irradiance fluctuation for clipping. 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/30min -> 2 ) then recombine the results. You can find a PDF tutorial about the whole process in our website: Pseudo sub-hourly Simulation Kind regards

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,

Hello, The available area in the Pre-sizing help in the System window, serves as a guide for a first order of magnitude of how many panels you can fit on a dedicated surface. This tool take only the size of the panels into consideration (not the spacing between the panels or a pitch). If no 3D scene is defined, no configuration other than what is defined in the system and orientation window is considered (no shadings). Defining a 3D scene with the surrounding shading elements, include electrical shading definition etc. will more accurately simulate the system. You find a tutorial for the 3D tool in the following link: Another potential important parameter for a vertical system would be the reflection on the ground. For a monofacial system, this is discussed in the following forum page:

Hi, Indeed the maximum number of rectangles is limited to 100. However, in most cases—even for large-scale projects—each table typically contains only a few strings, so this limitation normally is not issue. For example, if each table includes four twin half-cell panels arranged in portrait orientation, and each row of panels in the table corresponds to a single string, then the table would require eight rectangles in width (x-direction). Could you please clarify how the system layout is defined in your example? You can find more details about the partition model in the following help page https://www.pvsyst.com/help/project-design/shadings/electrical-shadings-module-strings/index.html?h=partition

Hello, If all the strings have the same length you can indeed use the Power sharing within the inverter. The two options should give the same result.

Hi, Changing these values in the project settings will not affect the simulation results — it will only have an impact in the triggering of the error message. The error message is designed to protect the inverter from potential damage when the absolute maximum input voltage is exceeded. In this situation, there is a real risk of damaging the inverter.

Hello, You set the Lower temperature for Absolut Voltage limit in the Project Settings, Design conditions window. Kind regards

The P50-P90 is fully described in the following youtube tutorial:

Hello, In the following youtube tutorial you find how to define the thermal parameters, soiling losses etc. Kind regards,