Linda Thoren

Dear hvf, The grid limitation is reflects a scenario where the grid manager impose a limit to the injected power to the grid. If your system at certain moment produce higher then this limit, it will be managed by the inverter as a clipping loss. There is a help page here explaining this further: https://www.pvsyst.com/help/grid_power_limitation.htm The power factor is the ratio between active and apparent power, i.e. Cos(phi) and does not limit the power to the grid at a certain threshold. The active power is the power obtained along one sinus period, when we integrate the product of the instantaneous Voltage by the Instantaneous Current at each time step. This results in a multiplication by the cosine of the phase shift: Pactive = Ueff * Ieff * Cos(phi) expressed in [kW]. The reactive power is the vectorial difference of these contributions: Preactive = Ueff * Ieff * Sin(phi) expressed in [kVAr]. Following help page explain the Power factor further: https://www.pvsyst.com/help/power_factor.htm Indeed, if the Nominal AC Power is defined in Apparent power in the inverter file, the two variants should give similar results. To assist you further please provide us with the loss diagrams for the two variants, or send your project to support@pvsyst.com Kind regards

Hello Sascha, By using the mixed orientation option, all the strings are the same lengths and by increasing the numbers of strings, you then increase with 16 panels every time. You have more liberty if you define sub-arrays, you then assign each sub-array to an orientation/inverter/MPPT. In the Sub-array name and Orientation dialog you can define a name of your sub-array and the orientation, in the generic example below I have 2 orientations, 3 subarrays in the first orientation and 1 subarray in the second orientation, see the list of subarrays to the right. You can create a new subarray, or copy a subarray by using the first two icons under the list of subarrays. I also activate the use multi-MPPT feature for this example and I activate the power sharing. Using these features I have defines a global system with 2868 modules and 9 inverters (1588 panels and 5 inverter in orientation 1 and 1280 panels and 4 inverter in orientation 2). I hope this example helps you to define your system. If not please send your project to support@pvsyst.com Kind regards

Dear Sascha N. By creating subarrays you can define different amount of panels per string, different amount of strings per MPPT, orientation etc. This gives you a large liberty to define exactly the amount of modules required. You find the list of subarrays to the right in the system window. I hope this helps, if you wish for more precise assistance, please provide us with more information of your system. Kind regards

Hi, Make sure you have ticked the alternative "Show P50-Pxx values on main results page" in the "Display on report" box in the P50 P90 window, see below. By generating a report, your main result will include also the specific production for the defined Pxx. See below the report of the DEMO Residential system at Geneva. Kind regards

Dear Andel, If you have defined the P50, P75 and P90, the specific production in kWh/kWp/year for the given probabilities is printed under System Production in the Main results page. Kind regards

Dear Cleyson, Thank you for your question. In the simulation, the inverter derating will depend on the inverter temperature. By default, the inverter temperature is the same as the ambient temperature, but this behavior can be changed in the Energy management tab. 1. In the OND file in the Output parameters, it is the Inverter's temperature that is indicated. With an increase of temperature, the Maximum Power is often limited. These values are defined by the manufacturer in the datasheet. In the case the temperature exceeds the threshold of where the power is limited this will be taken into account in the PVsyst simulation as an (extra) overload loss 2. Energy management a) External ambient temperature thus assumes that the inverter has the same temperature as the outside. b) External ambient temperature with shift allows to define that the inverter temperature will follow the ambient temperature, plus or minus a constant value in degrees that is defined as the "Temperature increase". For example if you define a temperature increase of 5°C, and at a given time the ambient temperature is 38°C, then at that time in the simulation the inverter temperature will be 43°C. c) Fixed temperature, correspond to the case the inverter is placed somewhere with a fixed ambient temperature (for instance inside with cooling) with a possibility to increase the temperature according (proportionally to) to the irradiance on your field, i.e. the power generated. In the meteo file for your site, the ambient temperature and irradiance are available and according to your definitions in the energy management tab, the inverter's temperature is estimated. The simulation will consider the limiting effects on the inverter at high temperature according the the output parameters in the OND-file.

Dear Michalis Angeli, You can change the template or create a new file with hourly timesteps as long as the csv file follows the required format. The date should be in the first column and the time format must contain the day the month, the year as well as hours and minutes. The load should be in the second column with the unit of the load specified in in the second row of the second column. Kind regards

Dear Arnon, In the detailed losses tab you can define the size of the DC wires, the losses due to the DC wiring is printed in the report but not the size of the wire. One option could be to add a Variant or Project note where you indicate the size and tick the box to include the notes in the final report. Kind regards

Hello, In the case of your first 5 inverters where all strings are the same, there is not necessarily a need to use the multi-MPPT feature and the power sharing, you can simply define the entire inverter. But of course you can also define it the way you have explained it. For the last inverter with different number of modules in series you should activate the Use multi-MPPT feature and define two sub-arrays, one with 1 MPPT input 4 strings and 28 modules in series, and the second one with 5 MPPT inputs 20 strings and 27 modules in series. By using the Power sharing, you will be sharing of Nominal Power between MPPT inputs of the same inverter. In the following links you can read more about the MPPT feature, and an example of a configuration using the MPPT feature and the power sharing: https://www.pvsyst.com/help/multi_mppt_use.htm https://www.pvsyst.com/help/powersharing.htm https://www.pvsyst.com/help/multi-mppt_more-examples.htm Regards

Dear Sheriif, The CSV file must follow a certain required format, you can see how they are supposed to be formatted in the templates. The date should be in the first column, it must contain day, month, year as well as hours and minutes. The load should be in the second column, with “Load” written in the first row and with the unit of the load specified in the second row. You can see find a tutorial for the self-consumption in the link below: https://www.youtube.com/watch?v=-PGRnnF1VuA

Dear Tormi Teedemaa, This is a PV module that you have defined yourself or imported from manufacturer. It is possible that some parameters are not well defined. Moreover, the choice of inverter should be based not only on the power but also for instance the operating voltage. In your print shot you you have only 1 module in series and 666 strings that is resulting in operating condition for your system of 31 V at Vmpp (60°C) when the inverter you have chosen has an operating voltage between 180-1000V, thus the error message in your print screen. By clicking the Sizing button, you can more clearly see the different limitations in your system. Kind regards

By clicking on the Sizing button you will see a graphic with the Array Voltage Sizing, showing the different limitations to consider when choosing inverter and sizing your system. You can consider choosing another inverter with another voltage range. An orange message is a warning, but you can still run your simulation.

Dear Michalis Angeli The error message indicates that the inverter power is strongly oversized, with a Pnom ratio of 0.5. The Pnom ratio is the ratio between installed Nominal PV Power (125 kWp) and the inverter (250 kW). Normally the Pnom ratio is around 1.25. You correctly use the subarrays, MPPTs and Power sharing, though the installed Nominal PV Power is too small compared to the inverter. Regards

Dear Javier In your first print screen you do not have 10 batteries, only 1. The error message suggest you to increase the battery capacity or reduce the charging power, to increase the charging time. Your PV array Pnom is 48.9 kWp which of course also has to be taken in consideration when dimensioning the storage. In the advanced parameters you also have the possibility to change the Minimum charging/discharging time. Regards

Dear Dimionge, The Normalized productions (per installed kWp) and the Performance Ratio PR is a way to facilitate a comparison between PV installations. You can read more about how these definitions and how they are calculated in the help page in the link attached below. https://www.pvsyst.com/help/performance_index.htm https://www.pvsyst.com/help/index.html?performance_ratio.htm You are also invited to watch a video tutorial explaining the graphs and the Balances and main results table, or read the pdf tutorial “My first project” explaining the different parts in the project report, see links below. https://www.youtube.com/watch?v=k8mftCOeq4U https://www.pvsyst.com/pdf-tutorials-grid-connected/ Regards

Dear Numca, Your problem is not clear. In PVsyst you need to have a number of strings that is a multiple of the MPPTs used. In your case with 3 MPPTs, it seems like you should create two subarrays, the first one with 1 MPPT and 5 strings, the second with 2 MPPTs and 8 strings. If your system is well dimensioned you should not have any error messages linked to the distribution of strings on the MPPT outputs. If this is not the answer to your problem please post a picture of your system configuration and the error message that you get. Regards

Hello, Currently only the predefined tables in the report options can be implemented in the report. The custom tables can be printed and exported, but not included in the general report. Regards

Dear Tomin Bejoy, What kind of construction is it that you wish to do? Is it linked to floating solar that is the origin of this topic? The print-shot you provide comes from a DC-grid project, you can start a DC-Grid project through the Project tab, choosing New DC-Grid project, see picture below. By opening a new DC-Grid project, you can in “System” construct a system similar to your screen-shot and in “Near Shading” you can construct a shading simulation. I hope this answers your question, otherwise please specify further what kind of construction you are referring to. Regards

Dear Florent D. You can import your measured GTI data as a “Custom file” in the PVsyst database. For the Meteo data, tick the box marked “Measured global on plane” and indicate the column with the GTI data, then in the Variables tab you specify the Azimuth and the tilt. Regards

In PVsyst we have 3 strategies for Grid-storage. In the Self consumption strategy, the produced electricity from your PV system will firstly supply the user’s need (consumption), secondly charge the BESS and lastly supply energy to the grid. With the Peak shaving strategy doesn’t involve an internal use of the energy and you can define the operating conditions such as Grid power limit and discharging. In the Weak grid islanding strategy, you define the Grid unavailability and your storage pack is meant to fill up for the times when you have no production from your solar panel, nor power from the grid. You can read more about this in the PVsyst help in the following link: https://www.pvsyst.com/help/grid_storage.htm Or watch some of the youtube-videos we have on the topic: https://www.youtube.com/watch?v=-PGRnnF1VuA&list=PLxdyykgAqoynTXUHWrdCxPSYLkhJ9mW7c https://www.youtube.com/watch?v=49d5pAV907Y&list=PLxdyykgAqoynTXUHWrdCxPSYLkhJ9mW7c&index=3 https://www.youtube.com/watch?v=jZKdz248WJQ&list=PLxdyykgAqoynTXUHWrdCxPSYLkhJ9mW7c&index=4 Regards

Power sharing ensures that the power generated by each MPPT controller is efficiently distributed across the different strings or groups of panels. This prevents one string from overloading while others underperform, maintaining overall system balance and efficiency. In your case, by not ticking the alternative "Auto-equal. Pnom" you are strongly overloading the first 3 MPPT, resulting in a Pnom ratio of 2.35, and a quite low Pnom ratio of 1.18 for the remaining 9. The Pnom ratio being the ratio between the installed power of the solar panels and the inverter (usually around 1.25). In your case without activating the MPPT-feature, it is equally distributed over the MPPTs with a Pnom ratio of 1.47

The warning message in orange suggests considering disabling “use multi-MPPT feature” for ensuring power sharing on each input. With all the strings being the same there is no need to activate the multi-MPPT feature and in Case 1 you risk getting overload losses if you do not define a set of subarrays where each subarray has a number of strings that is a multiple of the number of MPPTs. By activating the Power sharing and ticking the box "Auto-equal. Pnom" you should arrive at similar results as in Case -1 and the "single-line diagram" button will be activated.

The warning message in orange suggests considering disabling “use multi-MPPT feature” for ensuring power sharing on each input. With all the strings being the same there is no need to activate the multi-MPPT feature. In this case, the number of inverters is 1020.3 and thus do not reflect a correctly sized system in reality. Regards

Dear Pizush Shah, The PR will be lower with higher inverter losses. In Case 2, if you have created a sub-array for each MPPT, 4 sub-arrays with two strings and 8 subarrays with 1 string (or alternatively a first sub-array with 4 MPPT and 8 strings and a second sub-array with 8 MPPT and 8 strings) you correctly have a number of strings that is a multiple of the the MPPTs used. By activating the Power sharing between the sub-arrays this should lead to similar results as in Case 1. The green led will be activated if Power sharing has been correctly defined Regards

Dear Afshin, For a Grid-connected system with energy storage, any excess power will be stored in the battery before supplying energy to the grid. If the battery storage is fully charged, you have the choice to inject power to the grid or not by ticking the box “Allow solar injection into the grid” in the Operating conditions box. Regards