Linda Thoren

Indeed, only the area of the modules. Kind regards

Yes, make sure you tick the option "Create tracking fields" before filling the zone.

Hello Jarek, Indeed there is no straightforward way to define such a storage strategy system in PVsyst. The final result of the Peak Shaving strategy of course depend on a lot of parameters including the weather conditions on your site, the size of the battery pack, charging/discharging power as well as the grid limitation and discharging strategy. The grid-limitation must be rather restrictive to force the simulation to store the energy in the batteries instead of injecting it to the grid directly. This grid limitation will be the same every hour though so a too strict limitation will risk to hinder the batteries to discharge. It is on the roadmap to improve the battery storage strategies, but this is a very complex task and will not be available in the near future. Kind regards

Hello, If you are referring to the "Pre-sizing Help" and the "available area (modules)", this consider only the area of the modules (the size of the panels in the .PAN file) and not the spacing of them (mostly relevant if you have a tilted roof with a calculated available areas to put your panels). This is just a Pre-sizing Help that serves a first help to start your dimensioning and indeed not precisely adapted for ground availability. Kind regards

Hello, You can generate an hourly output file through the Advanced Simulation. Click Advanced Simulation (below the Run Simulation button), Output File, define Hourly values and choose the relevant Simulation variables. By running a simulation, a csv file will be created and saved in your workspace. Kind regards

Hello, In the current version on PVsyst, you can only have one orientation for a bifacial system. As Michele has mentioned above, there are a few regularity requirements that have to be met, you can find the bifacial conditions in this link: https://www.pvsyst.com/help/bifacial-conditions.htm As well as a youtube tutorial on the subject: Note that, as for the Pitch, the tolerance for the Max. tilt axis for the Bifacial 2D model can be modified on the Advanced parameters. Kind regards

Hello, You can define multiple sub-arrays and assign different inverters (as well as lengths of strings etc) to each sub-array. You find a list of the sub-arrays to the right in the system window. In the following youtube tutorial about Multi-MPPT and Power Sharing, you see a few examples of how different inverters have been used in one system configuration. Kind regards

Hello, If you have defined a transformer that is not disconnected during the night, the negative values could possible come from the Transformer losses. Transformers have a constant iron loss, even if no energy is being produced. To avoid this, you need to enable 'Night Disconnect', in the Ohmic Losses window.

Hello, Indeed you can make a second variant facing south and compare the results. Your simulation seems reasonable based on the information you have provided, though I of course cannot guarantee that it is all correct. Don't hesitate if you have further questions

Hello, Yes indeed you can do this by activating the "Use multi-MPPT feature" and create multiple sub-arrays. In the right in the system window you have a list of your sub-arrays. For instance, you can assigning 1 MPPT input to the first sub-array with 2 strings and 16 panels in series, and a second sub-array with 1 MPPT and 2 strings with 15 panels in series. In the following Youtube tutorial you have additional information of how to use the Multi-MPPT and Power sharing feature: Kind regards

If you have self consumption you can in the economic evaluation calculate the electricity sale as well as the self-consumption saving, see the two print screens below, where the first one correspond to the electricity sale (feed in tariff price) and the second, the price for the consumer to buy from the grid and thus an estimation of how much money is saved by avoid buying energy from the grid but self consume energy from the PVsystem. These can be in hourly values is you import a CSV file. In the following youtube tutorial, you have more information about how to use the Economic Evaluation in PVsyst (though this example is without self-consumption):

We have a new video tutorial concerning the multi-MPPT and Power sharing feature, further explaining how to define your system.

Dear Leonidas, Sub-hourly simulations are under development, but in the current version of PVsyst the simulation will be done in hourly time-steps. For the self-consumption profile, you can import a CSV file with sub-hourly values. In the economic evaluation you can import a CSV file with hourly time-steps for each hour of the year. In the following PVsyst help page you find more information about the custom feed-in tariffs: https://www.pvsyst.com/help/custom_feed-in_tariff.htm PVsyst will simulate the values you as a user put in, thus it is up to you to define the system that best correspond to your requirement. The input values suggested by PVsyst should be considered as suggestion and not as an optimization or most suitable solution.

Indeed the values for the sky diffuse and beam effective on the rear side are rather high. Other than the inclination of the panels, the pitch between the rows and the height above ground will have an impact the bifacial gain. In the analysis tool in the bifacial system definition window, you can evaluate the effect of changing these values as well as generate various graphs to better understand the impact of these parameters. See the youtube tutorial of how to use this tool in the link below:

To better understand the different losses in an inverter, please read: https://www.pvsyst.com/help/inverter_operating_limits.htm 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 see our tutorial of how to use the multiple MPPT and power sharing in the following link: Kind regards

Hello Allison, When using the multiple MPPT feature, it is important that the numbers of strings is a multiple of the numbers of MPPT inputs, or PVsyst cannot evenly distribute the strings over the MPPTs and you risk increased inverter loss over nominal inverter power. For instance, 46 strings over 18 MPPTs results in 2,5 strings per MPPT. In general, if you have multiple inverters with the same configuration, the number of strings and MPPTs can be multiplied with the number of inverters and be assigned to the same configuration in the Power sharing window. If you think this is not the case, you should define several configurations in Power sharing window, thus also additional sub-arrays. The following youtube tutorial show additional examples of how to use the Multi-MPPT and Power Sharing Kind regards

Dear Reza, By "position of the modules", do you mean the location of the installation? The simulation output is based on metrological data that will differs significantly depending on the location. Thus it is not the location per se that is necessary but hourly values of the position of the sun, the irradiance, temperature etc. If you refer to how the tables a placed compare to each other, this can be done in the Near shading and the scene can be saved and exported an image. Kind regards

Hello, The global incident in collector plane is the result of the transposition of the irradiance from horizontal to the plane of the array. A collector plane with 90 degrees tilt will receive less irradiance compared to a the horizontal and thus a negative value. Kind regards

Dear Eduardo Lopez, Thank you for your question and for outlining your specific use case. Currently, it is not possible to define different thermal constants within a single simulation, this might be something we can develop in the future. Possible work arounds would be to make a weighted average or divide the project, simulating one variant for each Uc value. Kind regards

Dear Tia, To configurate one string with 5 modules in series and a second with 6 modules in series, you should define 2 sub-arrays (see a list of your sub-arrays to the right in the system window). You can copy your first sub-array, modify the number of MPPT inputs, modules in series and in strings and activate the Power sharing feature, to share the power of the two sub-arrays within the same inverter. We have a youtube tutorial on this subject that further explains how to configure the sub-arrays, the use of the MPPT feature and the Power sharing: You can also fins more examples on the PVsyst help page: https://www.pvsyst.com/help/multi_mppt_use.htm https://www.pvsyst.com/help/multi-mppt_more-examples.htm Kind regards

Hello, In the Advanced Simulation window (the button right under Run Simulation) you can precise which dates you want to simulate and by creating a output file, you have the possibility to create a .csv file with hourly, daily or monthly time steps for any simulation variables that are relevant for your project. Kind regards

Hi! Thank you for your input and concrete example. In PVsyst, peak shaving has primarily been developed as a strategy to manage scenarios with grid limitations by shifting the production peak, rather than as an economic strategy for discharging at peak prices or peak electricity consumption. Further development of storage strategies is planned for next year. Kind regards

Hello, The Pnom ratio, also known as the DC-AC ratio, refers to the ratio of the nominal DC power output of a solar panel array to the nominal AC power capacity of the inverter, indicating how much DC capacity is installed relative to the inverter's AC capacity. Thus, the Pnom ratio changes if you adjust the number of panels installed or the capacity of the inverter. Kind regards

Hello, In the following youtube tutorial you find the information of how to define a self-consumption profile in a grid-connected system: Kind regards

Yes it is possible to import a load profile through the self consumption window. For the importing of hourly or sub-hourly parameters in PVsyst, you must use the following standard format: -Text file (CSV format with commas or semicolons). -All lines beginning with the hash symbol '#' are assumed to be comments, and will be ignored. -Blank lines are ignored. -The first line that does not start with #, holds the column titles. The first two columns should be "Date", and "P Load", further columns are ignored. -The following line contains the units of the data in the columns. The date should have no units, the units for the load can be power ([W], [kW] or [MW]) or energy ([Wh], [kWh] or [MWh]). -Then there follow the lines with the values, one line per data entry. -The date and time in the first column can be given either in European format (DD/MM/YY hh:mm) or in US format (MM/DD/YY hh:mm). -The file should contain all hours of a generic year (from 01/01 at 00:00 up to 31/12 at 23:00). Only day and month will be retained, the year will be ignored. -These dates/hours do not need to be related to the dates of your input meteo file: they are for each hour of a generic year. Please also see our youtube tutorial of how to define a self consumption profile in a grid connected system: Kind regards