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The albedo shading loss will be the same. But with all the parameters set for a bifacial system the variable "ground reflection on front side" is added for the inter-row ground reflection, as described in the help page. For a monofacial system, the irradiance that falls between the rows is not calculated and the contribution of the ground reflection on front side is in general negligible for systems with a low tilt angle. To evaluate this gain, at the moment you need to set the bifacial parameters as described above.

Are you saying that the (front-side) near shading loss would be lower if i modelled a bifacial system because these systems are more precisely modelled or defined, even though the near shading losses happen before any bifacial modelling in the loss diagram (and should be independent of whether the system is mono or bifacial)?

Hi, The bifacial model presently available in PVsyst is based on a simplified 2-dimensional representation, with similar assumptions as the "unlimited sheds" or “unlimited Trackers” PVsyst simplified calculation. This approximate calculation may be extended to a 3D scene, provided that this 3D scene is sufficiently well represented by the "Unlimited sheds or trackers". Thus, simply use the option "Use unlimited sheds 2D-model" in your second print screen. You find a tutorial about the bifacial model conditions for the 3D scene below:

Dear PVSyst Team, I am currently trying to simulate a bifacial system in the PV System configuration. However, when I open the Bifacial System settings, the 3D shading scene does not appear to be connected to the bifacial configuration. In the 3D Shading section, I have already created and added the 3D shading scene. However, it is still not recognized in the Bifacial System window. Could you please assist me in resolving this issue? Is there any step that I might have missed which causes the 3D shading scene not to appear in the bifacial system settings? For your reference, I have attached screenshots of both the Near Shading and Bifacial System sections. Thank you for your support.

From your table, I understand you have in one case 2*2 MPPT with 2 strings each, and on the other one only 2 MPPT with 2 strings each, is that correct ? You may or may not see any difference in your results depending on how you've set your simulation parameters. Having two strings per MPPT may result in a lower production when : The combined strings power or current exceed the MPPT limits. The voltage mismatch value in the detailed losses in not null. Please also note that the maximum MPPT power depends on the power sharing option. If you have unbalanced MPPT input power, you can redistribute the total inverter power accordingly. This will let the MPPT connected to two strings to have a higher power limit, and strongly reduce the difference between your two configurations

Hi this is still not possible. It is still as @dtarin commented.

Hi, Indeed, today the ground reflection between rows is only considered for bifacial systems. In general, this contribution is very low with sheds and trackers systems, but becomes more important with high tilts and large pitch and crucial with vertical East-West bifacial systems. The calculation of the ground reflection of the front side involves an accurate definition of the ground, its albedo, the geometry, and the full calculation of the ground points view factors. So, the ground reflection of the front side is considered for bifacial systems since all of the needed parameters are already defined, but neglected for monofacial systems. The only way to run a simulation including the ground reflection for the front side for a monofacial system today, would be to alter the PAN file (activating the bifaciality and put the bifaciality factor to 0) and run a simulation with the bifacial parameters, though everything except the ground reflection on front side will be 0 given the bifaciality factor of 0. In the following help page, the reflection on the ground is further discussed: https://www.pvsyst.com/help/project-design/bifacial-systems/bifacial-systems-results.html

Hi @Michele Oliosi, I, too, am looking for the individual inverter-level output data from the 8760. My system has 9 inverters. So, is it possible to get the individual inverter level generation data for each of the 9 inverters in separate columns after PVsyst simulation in the 8760 directly? Could you please guide me on this? Hi @solarDG1470, Did you figure out a way for this? Does PVsyst provide this data or is there some other way around? I would really appreciate it if you could share your knowledge on this. Thanks!

Hello, The far albedo in the project settings, will be considered in all projects and correspond to the albedo of the surrounding of the project. The albedo in the bifacial system window is indeed only set for bifacial systems and correspond the the albedo of the ground just underneath the modules. This is not necessarily the same as the far albedo of the surrounding. Kind regards

Hi everyone, I have a concern: will the simulation results be different with different configurations like below picture? I think it's yes in practical but in simulation, it shows not anymore different. Could anyone help me to understand this, please? Let's assume the model being used is SG125CX-P2

Sorry, the albedo shading factor should be *~65% and *~48% during these times, not sure what happened there

Hi, It's definitely possible. Currently the prerequisites for the EPI test are not very strict. It is about comparing total expected energies with measured ones, filtering for various contexts, with an hourly aggregation of measurements. PVsyst will generate a time series of results with various intermediate variables, that can help with filtering (e.g. for constrained periods). This time series can easily be compared with the measured one. For capacity testing (PPI), depending on the version of the standard -2, ed. 1 or 2, it is more or less easy to do. Ed. 1 should be straightforward. Ed. 2 has minute simulation as a prerequisite. Currently, PVsystCLI or PVsyst + batch can help implement a batch of 60 simulations (one for each minute in the hour) to mimic a minute-resolution simulation. This is a bit cumbersome, though. Luckily, we are working on PVsyst 8.1 which will simulate in minutes as well. The version is well underway (and the minute simulation is confirmed to work). This will make the ed. 2 capacity test straightforward as well.

Thanks dtarin, it worked!

You can find more information here: https://www.pvsyst.com/help/physical-models-used/pv-module-standard-one-diode-model/pvmodule-structure/bi-facial-modules.html

Dear PVsyst Team, I would appreciate your clarification regarding the definition and use of the Albedo parameter in PVsyst. In the software, the Albedo value appears in two different locations: Project Settings → Site → Albedo System → Bifacial System → Albedo Could you please clarify: What is the functional difference between these two Albedo inputs? In bifacial simulations, should both values always be identical for consistency? kind regards, Irakli

Thank you. Is that a fair assumption that only the first row is "seeing" the albedo? With typical GCR ~40% or lower there will be sun hitting the ground between the panels by early to mid morning. E.g. in my snip above (36% GCR), at 8am only 65% of the ground is shaded and at 9am only 48% is. So the albedo shading factor should be ~35% and ~52% during these times?

Learn what bifacial factor means in solar panels, how it affects energy output, and why it is important for improving solar power efficiency and performance.

Go to output file, check the box "file name" under "output file". Set your variables. The name doesnt matter. Hit okay. Go to aging tool, have your ageing parameters set, I check both output file and report (to see everything ran correctly), click run simulation from within the ageing menu. it should output then.

Hello Giancarlo, Do you have a valid license ? because this is one of the limitation of the DEMO mode. If you do have a license; please send us your logs at support@pvsyst.com: Regards; Laurent

I have a question: is it possible to set a layout zone and automatically fill it with the east-west table arrangement?

any updates on how to get around the demo version?

Hi, I have modelled a solar farm installed 5years back and factored in the yearly degradation rates in the detailed losses>>aging section and enabled output file generation as attached below. For some reason, when I run the advanced simulation, it returns only Y1 E-grid values. How do I generate an output file with the hourly E-grid values for the current year, and later years? Thanks, Tonderai.

That would be great.

Hola a todos, favor su ayuda. No puedo agregar un nuevo sitio en pvsyst, me aparece como deshabilitado la opción Nuevo

Hello everyone, I have a question regarding the use of PVsyst for performance modeling in the context of performance testing (PPI and EPI) as described in the standards IEC 61724-2 and IEC 61724-3. Can PVsyst be used to generate a performance model that is suitable for performance testing according to these standards? Does anyone have practical experience with this? Is it possible to use 1-minute measured data in PVsyst for this purpose or what is the minimum data resolution supported for imported measured data? Thank you in advance.