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Hello, In the Advanced Simulation, you can create an Output File with hourly or daily values for a large number of variables, for example Global horizontal irradiation, Sun height, Sun azimuth, Global corrected for horizon/far shadings. Kind regards

Hello PvSyst team I would knowing how i find the Daily extra-terrestrial irradiation on horizontal plane (H0) or the sunset hour angle in order to calculate H0 in PvSyst or a auther ideas to get them Thank you verry much.

Does the PVsyst irradiance optimization feature stow trackers to a flat (phi=0) position during all times of high diffuse conditions? What is the diffuse ratio that triggers a flat position? Are there times when the tracking angle would be non-zero? For example, fully covered weather makes sense to go flat, but what if its only partially cloudy.

Dear Irakli, It's possible to change these values. If you select all the tables, your modification will apply to all the selected tables. To modify the tilt, for example, just click in the box where you want to change the value, and it will be applied. Regards, Muhammed Sarikaya

Dear Claire, It seems your view is in 'perspective view'; maybe you should try clicking on the 'Orthogonal Projection' button, and you will see your table at the same height. Regards, Muhammed Sarikaya

Hello, The inverter clipping losses, the Inverter loss over nominal power, is to large extent due to the sizing and configuration of your system. If you have higher clipping losses than expected, it could be due to the the definition of the multi-MPPT inputs. Please read the following help pages on the subject: https://www.pvsyst.com/help/powersharing.htm https://www.pvsyst.com/help/multi-mppt_more-examples.htm It could also be temperature derating, at high temperatures inverters often have a lower nominal power. You can see the temperature evaluation of the inverter in the Output parameters in the .OND file.

Hello, To our knowledge there is no bug in the multi-MPPT features. Large Inverter Losses over nominal inv. power could appears in the case if for instance the number of strings are not a multiple of the number of MPPT inputs or if the power sharing is not activated (with a green "active" light). Please read more about the multiple MPPT and power sharing in the following help pages: https://www.pvsyst.com/help/powersharing.htm https://www.pvsyst.com/help/multi-mppt_more-examples.htm If you still have difficulties, please send your project as zip file to support@pvsyst.com and we can have a closer look at it. Kind regards

Hello, Good afternoon I am using PVsyst version 7.4.5 right now. Recently, I was working on a project capacity of 2008.55 kWp. It consisted of an East-West orientated PV system. I used the multi-MPPT feature to distribute the different sizes of strings. Having done the simulation, there was very high value of Inverter Loss over nominal inv. power (more than 2%). On the other hand, when I did not use the multi-MPPT feature and distributed the different sizes of strings within whole inverters, there was a very low value of inverter loss over nominal inv. power (-0.09%). Is there any bug in the software when it comes to using the multi-MPPT feature for the East-West PV System? Thank you

Dear Michele Thanks, Can you please confirm my understanding is right from your post above 1> .SYN.MET Used only when we have 1 Year monthly data. This is in .SIT. From SIT an synthetic hourly file SYN.MET can be created using "synthetic data generation" tab to get 1 Year hourly file (can be used as TMY) 2> TMY.MET As i already have 15 years Solcast hourly data i don't have to worry about creating synthetic file. I can directly create TMY.MET from "TMY generation" tab to get Typical 1 year hourly file for final simulation use.TMY.MET

Thank you for the help. I have one more question. Is it possible to change "Plane Azimuth" and "Plane tilt" by editing ? Please see the attached screen where this data are not editable.

Hello, I have a project where I created a 3D scene of trackers in near shading. The height of the placed trackers is 1.5m and it is seen in the list of management tools, but in the near shading, the trackers appear to have different heights in Z-Y plane. What could be the problem!?

How can I calculate inverter clipping losses with pvsyt? In my calculations the losses are lower than they are. Where am I making mistakes? Could you help?

Hello, On your last screenshot you need to click on the "System" button. There you need to define 4 subarrays (one for each orientation) and each subarray should have the same number of modules and area than the corresponding orientation in the 3D scene. Then the error should go away. However, you should first determine if 4 orientations is the correct choice for your project. By looking at your first screenshot I see that your orientations are more or less similar. Are the different orientations only due to the slope of the ground or do you really have specific zones where all tables share the same orientation? If the different orientations are due to the slope of the ground then it would be better to have 1 orientation only (as long as all tables are on the same side of the hill) because with multiple orientations the tables belonging to the same orientation would not always be close to each other so they would not be connected to the same physical inverter and the simulation would be less realistic. To get 1 orientation only you need to increase the tolerance in your first screenshot and then click on the "Identify orientations" button. I hope this helps.

Thank you Michele, I followed your suggestion and ran some processing in excel and it worked well. It would be interesting to see if limiting the rest angle for Backtracking makes it's way into pvsyst as it seems like this is becoming a common method for mitigating glare for roadways etc.

Dear Alessander, It looks like PVsyst is freezing when it uses your computer graphic card driver. Please email us your PVsyst LOG files (using menu <file> <Export logs>) so we can have a deeper look. In the meantime, you can already try to update your graphic card driver by following the procedure documented in our FAQ: https://forum.pvsyst.com/topic/1253-updating-your-graphics-card-driver-pvsyst-660-and-above/?do=findComment&comment=3402 Alternatively, you can try to run PVsyst with another graphic card driver of your PC if you have one. This selection is available in Windows settings (in Graphics settings) after you have chosen PVsyst program file: I hope this will help you to resolve this issue. Best regards. Nils Lang PVSYST SA - Technical Support

Dear Irakli Bezhuashvili, Please email us at support@pvsyst.com your PVsyst LOG files (menu <File> <Export logs>) so we can analyze the issue you reported. Best regards.

Hello, Projects with the same name and data appears in the soft. I tried to delete one of them but this causes emptying data from the second project. This happened 2 times in one day. Bellow screen shows 2 project with the same name "Jugaani SPP"

Hello, I imported PVC file from PVdesign successfully. In the "Near shading 3D scene" followed the following fields: "Shading field construction"-"Tools"-"Orientations Management", identified orientations (Result is attached, see file "Screenshot 1") and I received 4 different orientations. "Near shading 3D scene" page shows the following notification - "Orientation #1:"The area of the 3D field is lower than ......" (screen in attached, see file "Screenshot 2). Project first page screen is attached which shows mismatch between "System " and "Near Shading" (See attached file "Screenshot 3"). Can you please tell how to proceed? In forum page is written "After creating the orientations in the 3D scene (8 at most), you will have to harmonize them with those defined in the system and assign the subfields to these orientations", this may be the way but I can not find out how the subfields should be assigned to these orientation?

Prezados, Boa tarde, Estou tendo problemas para a geração de relatório após simular. O software trava no meio do carregamento e não gera. A versão instalada é a 7.4.6 Obrigado

Hello, how should be subfields assigned to these orientation?

There are different possibilities to import measured data. The PVsyst standard format is the most straightforward way to import these data (see the help page "Meteo Database > Import meteo data > PVsyst standard format for hourly meteo data" for more information). Otherwise, you could also import measured data through "Databases > Custom Import". (see the help page "Meteo Database > Import meteo data > Import ASCII meteo files" for more information).

This is not simple, but let's see what we can do. First, mutual shadings tend to happen starting with 20°- 30° angles of sun height. These are the times when backtracking is interesting, but also where it seems you are expecting glare. So you have a double constraint on these low sun angles. Note that at times when backtracking is limited, you will have mutual shading. In these cases, it will be best to use just regular tracking. This is because backtracking is only convenient whenever you are removing most of the mutual shading (and electrical mismatch effects). So once you are in a mutual shading regime, I think it is probable that regular tracking will be best. Based on that, you can run two simulations: one with backtracking and one without. For each of them, you can generate an hourly output file. Then you can process the data, and use the regular tracking one whenever the backtracking rotation angle would be < 20°. The resulting dataset can then be summarized to obtain yearly yields, etc.

This error message was meant to be present in the previous versions of PVsyst but a bug prevented it from appearing. This has been fixed in the latest versions of PVsyst, that’s why you see the error message now. To get rid of the error message, you can go to the Home window > Settings > Edit advanced parameters, search for “spread” and modify the following value: I hope this helps. Note that cases which have a very large tilt spread may induce a certain uncertainty in the transposition calculation.

Dear Bridel I've sent the Vaisala data file to support@pvsyst.com. At the same time, there is another problem that I have a few days measured value,can I simulate this by replacing the data from Vaisala for the same time period and importing it into PVsyst? If not, how can I use the actual measured values to check the PR of the project? Looking forward for your answer and thank you for your attention and availability.

My guess is that the warning is with respect to the HV portion, which you dont have shown in the image. The OND file doesnt account for LV losses. LV losses are zero since the MV transformer is connected to the inverter. You will define a MV line loss however from the MV inverter(s) to the HV transformer(s). Since the OND file accounts for the MV transformer, maintain 0% in the no-load and full-load loss.