Fresh Questions, Practical Answers: PVsyst Q&A Series #19

1.How to Calculate the power generation gain of the back side of Bifacial system? Answer: During the simulation, you can first choose single-sided simulation and then select Bifacial system. By subtracting the power generation of the two, you can calculate the theoretical power generation of the back side. 2. What is the difference between the back radiation gain and the power generation gain in a bifacial system? Answer: The backside radiation gain is an optical gain, which is different from the electrical gain. Therefore, the optical gain cannot represent the bifacial power generation gain. For example, as shown in the figure below, the backside radiation gain is 4.1%, and the actual effective backside radiation gain needs to be multiplied by the bifaciality factor of the PV modules. The power generation gain can be obtained through single-sided simulation and bifacial simulation. In this example, the single-sided power generation is 152,089 MWh,…

Fresh Questions, Practical Answers: PVsyst Q&A Series #20

1. Regarding the settings of circumsolar scattering in different versions, what impact do they have on the simulation results? Answer: In previous PVsyst versions (prior to 6.8), the circumsolar scattering was included in the scattering, whereas versions after 7.0 handle it separately. Especially in application scenarios with large tilts and vertical installations, separate treatment helps improve the accuracy of simulation results. Taking the vertical installation method of a PV module in Northern Europe as an example, the two simulation results of ambient solar radiation included in the scattering and treated separately are shown below. Different settings result in a difference of about 0.34% in hours of production. After separate treatment, the yield is higher. 2. How to set the LID and annual attenuation of PV modules? Answer: LID stands for Light Induced Degradation, which is related to material aging and annual degradation. These two factors are set separately in the…

Fresh Questions, Practical Answers: PVsyst Q&A Series #5

The PVsyst version used for the following Q&A is 6.66 or higher, but other lower versions can also be referenced for guidance. 1. Can the power factor of the inverter in PVsyst be adjusted? [Teacher Chen]: By default, the power factor in the inverter parameters is set to No settings, but you can open the inverter parameters and set it within the range of 0.8 leading to 0.8 lagging in the "Power Factor" option, as shown in the interface in Figure 1. ▲Figure 1: Power Factor Adjustment in the Inverter Parameter Interface 2. How to set up a system with 39 PV modules? Should there be 2 sub-arrays? One with 20 modules and one with 19 modules? [Teacher Chen]: As indicated in the title, this photovoltaic system utilizes a total of 39 modules and shares a single 10kW string inverter, where the MPPT input channels of the inverter are 2…

Fresh Questions, Practical Answers: PVsyst Q&A Series #18

1. Why is there a difference in shading loss when importing terrains of different ranges? Answer: The software simulates the calculation of shading loss mainly in two types: near shadings and horizon shadings. The former requires modeling, while the latter requires setting the horizon. If a model containing terrain contours and arrays is imported into the 3D modeling, it is generally calculated as near shadings. For terrains with a large area and the farthest point being more than 10 times the diameter of the photovoltaic field, if the ground elevation in the distance is high and may cause shading to the photovoltaic field, the horizon should be set in the software to calculate the horizon shading loss. If not set, the software defaults the horizon shading loss to 0%, which may result in a smaller simulated shading loss. 2. When using a master-slave inverter, what issues should be noted? Answer:…

Fresh Questions, Practical Answers: PVsyst Q&A Series #17

1. After changing the terrain albedo, why doesn't the result of batch simulation change? Answer: When users select "Monthly Data" when setting the terrain reflectivity, as shown in the figure, changing the terrain reflectivity during batch simulation may result in no change in the production data, provided that other variables remain unchanged. 2. In the same region, will different elevations cause significant radiation differences? Answer: The shorter the path of solar radiation through the atmosphere (the higher the elevation), the less it is weakened by the atmosphere, and the higher the radiation that reaches the terrain will be. Therefore, when importing meteorology data, it is necessary to accurately fill in the altitude of the project site. As shown in the figure, there are certain differences in horizontal plane radiation and scattered radiation between Beijing at an altitude of 200m and 55m. 3. What does the height above ground of bifacial…

Fresh Questions, Practical Answers: PVsyst Q&A Series #16

1. What issues should be considered when simulating a photovoltaic power station on water using PVsyst? [Teacher Chen]: 1) Energy balance coefficient Installing PV modules on the water surface, in actual operation, due to the evaporation of water vapor on the water surface, the ambient temperature on the water surface will be lower than that on normal land, so the temperature of the modules will also be lower. According to the energy balance theory, the temperature of the modules is related to the ambient temperature, the irradiance on the inclined surface of the modules, the transformation efficiency of the modules, the absorption coefficient of the modules, and the U value (also known as the K value). U · (Tcell - Tamb) = Alpha · Ginc · (1 -Effic) Additionally, U = Uc + Uv · v, where Uc is a constant and Uv is a variable related to wind speed. →…

Fresh Questions, Practical Answers: PVsyst Q&A Series #15

1. How to display the PR temperature correction value CPR in the Report for PVsyst version 6.75? [Teacher Chen from Candela Academy]: Open the simulated report using PVsyst and click on "Settings" in the top left corner, as shown in Figure 1. The PR temperature correction value CPR is displayed in the form of a graph or table. Check "Graph options" to display it in the form of a bar graph. In the "monthlyresults table", select the 8th column to display "Weathercorrected PR" in the form of a table. Refer to Figure 2. ▲Figure 1 ▲Figure 2 2. How does PVsyst import the PAN file of the PV module? [Teacher Chen]: Open the software's main interface, click "Files", select "import components", place the PAN file on the desktop, browse the desktop and select the desktop folder, and once the "import" button changes from gray (indicating it is unavailable) to a…

Fresh Questions, Practical Answers: PVsyst Q&A Series #14

1. Can the batch processing mode Calculate the yield Data for a specific month? [Teacher Chen from Candela Academy]: For the batch processing type, currently, it can only be simulated for the entire year. ▲Figure 1 ▲Figure 2 2. What does -0.7V mean in the PV module panfile? [Teacher Chen from]: As shown in Figure 3, the -0.7V indicated by the red wireframe represents the reverse voltage of the bypass diode. ▲Figure 3 3. How to batch modify the tilt and azimuth of PV modules or arrays in the 3D modeling interface? [Teacher Chen]: As shown in Figure 4, you can use the "Group" function to incorporate arrays or PV modules into the group, allowing for one-time selection for batch modification. Click on "Group#1 (79)", where the number 79 indicates that there are 79 arrays in this group. Right-click the mouse to see "Select all objects in the group". After…

Fresh Questions, Practical Answers: PVsyst Q&A Series #13

In the process of using PVsyst software, have you encountered similar issues such as how to correctly set two different orientations in 3D modeling? What should you do when an error is reported after importing measured radiation data into PVsyst? How to quickly select PV string arrays in the 3D modeling interface? With these series of questions, Candela Academy continues to launch the 13th issue of the practical Q&A series. Please see this issue for answers to your questions. 1. The photovoltaic array model in the 3D modeling process belongs to two orientations and tilts, but there is a problem as shown in Figure 1, where Orientation 1 and Orientation 2 are the same. How can this be resolved? ▲Figure 1 [Teacher Chen from Candela Academy]: As shown in Figure 2, the arrays are arranged along the north and south slopes of the roof using "Domes PV tables", with a…

Fresh Questions, Practical Answers: PVsyst Q&A Series #12

1. The capacity-matching ratio of the photovoltaic system has been set to 1.42, but the power output limit is set at 1.1%. Is this accurate? [Teacher Chen from Candela Academy]: Currently, PVsyst can effectively simulate and emulate the setting of over-matching ratio and whether there is a limit on loss due to over-matching. As shown in Figure 1, in the system settings interface, we can obtain rough values of overload loss under different Pnom ratios. ▲Figure 1 After the Simulate ends, we can see more detailed overload losses in the "Detailed inverter losses" section of the simulation results, as shown in Figures 2 and 3. ▲Figure 2 ▲Figure 3 2. If there are measured environmental temperature and horizontal plane irradiation data for a certain project site, how can they be quickly imported into PVsyst software for use? [Teacher Chen]: If you have the radiation data for one month and the…

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