For First-Time PVSyst Users｜Basic Operations You Can Learn in as Little as One Day

Table of Contents

• An overview of the basic operations you should first understand in PVSyst

• Learning order to master in one day

• Items to check first when creating a new project

• Approach to site information and meteorological data settings

• Basics of entering system capacity and equipment configuration

• Points to note when setting orientation (azimuth) and tilt angle

• Basic operations for handling shading effects

• Approach to inputting loss conditions

• Workflow for running simulations and checking results

• Key points to check when reading the report

• Common pitfalls for beginners and how to address them

• Organizing on-site information to improve accuracy in practice

• Summary

Overview of the basic operations you should understand first in PVSyst

PVSyst is specialized simulation software that estimates the power output of photovoltaic systems and assesses the validity of design conditions. For first-time users, the interface contains many items and technical terms, so trying to understand every detail from the start can easily lead to confusion. What you should keep in mind at the outset is to think of using PVSyst not as memorizing individual button operations, but as a process of sequentially building up the design conditions.

The basic flow is to choose the project location, set the weather conditions, enter the configuration of the solar panels and PCS, decide the azimuth and tilt angles, reflect shading and loss conditions as needed, and finally run the simulation and check the results. Once you get the hang of this flow, even if you are confused by minor differences between screens, you will be less likely to lose track of which conditions you are currently entering.

In the basic operation of PVSyst, what’s important is not only entering correct numerical values. It is also crucial to judge which conditions have a significant impact on energy production, which conditions can be treated as assumed values, and which conditions should be revised later. Especially in practice, not all design information is necessarily available from the outset. Site layout, surrounding obstacles, installation angle, equipment specifications, and loss conditions may change along the way. Therefore, when using PVSyst, it is important to record the input conditions so they can be reviewed later.

For beginners, it's recommended to first understand the overall workflow of power generation simulations and to dig into detailed settings as needed. Even if you plan to learn the basic operations in one day, you don't need to cover every feature. Making your first goal the ability to independently reproduce the full sequence—creating a new project, entering basic parameters, running the simulation, and reviewing the report—will help you learn efficiently.

Learning sequence to memorize in one day

To learn PVSyst in as little as one day, it's effective not just to scan the screens in order but to create a mock project and run through it to the end. Even if you plan to use a real project in practice, rather than starting work on the actual project from the beginning, it's reassuring to first check the workflow under simple practice conditions. Decide tentatively on the plant location, panel capacity, installation angle, PCS capacity, etc., and prioritize reaching the simulation results without getting too hung up on details.

In the morning, it's a good idea to spend time understanding PVSyst's screen layout and the workflow for creating a new project. Confirm where to set the project name, where to select the site, and where to handle the meteorological data. At this stage, it's fine if you don't fully understand the meaning of each numerical value. The goal is first to grasp the major groupings: project, site, meteorological data, and system configuration.

Next, from late morning through the afternoon, proceed to input the equipment configuration and design conditions. Enter the solar panel capacity, number of panels, numbers in series and parallel, PCS capacity, etc., to establish a sense of the overall system scale. At this stage, verify that the entered capacity matches the assumed plant size. If the numerical consistency is significantly off, the simulation results will be difficult to use in practice, so it is important to carefully check the capacity units and the meaning of each input field.

In the latter half of the afternoon, check the orientation, tilt angle, shading, and loss conditions. These are important factors that affect power generation, but they can be confusing for beginners if they try to adjust them in detail right from the start. First set them to standard values and experiment by changing which conditions and seeing how the results change to deepen your understanding. Finally, run the simulation and review the results screen and report. At this point, by looking at the annual energy yield, monthly yields, breakdown of losses, and performance ratio, you can get a complete experience of the basic use of PVSyst.

The key point of a one-day learning session is not to try to create a perfect design from the outset. The level of accuracy required in practice is gradually increased as you incorporate accurate site information, equipment specifications, and shading conditions. On the first day, focus on understanding where and what to input so that the simulation can be carried out.

Initial items to check when creating a new project

The first task after launching PVSyst is to create a new project. A project is a container for managing basic information and simulation conditions for each case. Properly managing the project name, location, and design pattern makes it easier to compare simulations with different conditions later. A common pitfall for beginners is failing to distinguish between the project name and the simulation conditions, which leads to mixing multiple design options together.

In practice, you may consider multiple patterns on the same site with different panel capacities, layouts, tilt angles, and equipment configurations. Therefore, it is a good idea to give the project a name that makes the project easy to identify and to give each study condition a name that clearly indicates its contents.

For example, if you change the tilt angle or the PCS capacity within the same project, make the condition names such that the differences are apparent from the names alone, which will help prevent confusion when you review reports later.

When you create a new project, first confirm the site location. In solar power generation simulations, solar irradiance, temperature, and solar altitude vary by location, so setting the site is very important. If the latitude and longitude are significantly off, the estimated energy production will stray from reality. Do not rely solely on an address or place name; check the latitude and longitude as needed and verify that they correspond to the intended site.

It is also important to organize project storage locations and file management early. PVSyst simulation results can produce multiple outputs even with slight changes to the conditions. If file names or storage locations are ambiguous, you can lose track of which result reflects the latest conditions and which is intended for submission. If you establish management rules from the first time you use the software that make the project name, creation date, and analysis conditions clear, you can reduce rework in practice.

Approach to Location Information and Meteorological Data Settings

When using PVSyst, the first items you should carefully check are the site information and the meteorological data. The power output of a photovoltaic system is heavily influenced by solar irradiance and temperature. Higher irradiance generally increases generation, and under high-temperature conditions you must account for reduced panel output. For this reason, which location and which meteorological data you use directly determine the reliability of the simulation results.

Beginners tend to treat meteorological data as merely a required input item, but in practice it is a very important prerequisite. Even when locations are only a few dozen kilometers apart, weather patterns can differ between coastal areas, mountainous regions, urban areas, and inland areas. In particular, in regions affected by snowfall, fog, sea breezes, or topography, it is advisable to verify local conditions separately rather than relying solely on standard data.

When configuring meteorological data, first select data that is close to the target site and verify that the latitude, longitude, and elevation do not differ significantly. Elevation affects temperature and solar radiation conditions, so exercise caution in mountainous areas or regions with large elevation differences. If measured data or provider-specified data are available, confirm how they should be handled in advance and manage them to avoid mixing them with standard data.

When learning PVSyst in one day, it's okay if you can't perfectly perform detailed comparisons of meteorological data. However, make sure to develop the habit of recording which data you used. Later, when explaining the basis for the estimated power generation, if you cannot describe the types of meteorological data used and the site conditions, the credibility of the simulation results will be weakened. Practitioners who may need to submit reports should aim to be able to briefly explain the reasons for selecting the meteorological data.

Basics for Entering System Capacity and Equipment Configuration

After setting the site and meteorological data, next enter the photovoltaic system capacity and equipment configuration. Here you set the PV panel capacity, number of panels, number in series, number in parallel, PCS capacity, and so on. In PVSyst, because these parameters affect electrical consistency, you need to verify not only the total capacity but also that the configuration is electrically consistent.

What beginners should first understand is the relationship between panel capacity and PCS capacity. The total capacity of the solar panels is the DC-side capacity, and PCS capacity is the capacity of the equipment that converts to the AC side. This ratio changes outcomes related to power generation and output curtailment. If the DC-side capacity is too large, peak output can be limited under certain conditions. On the other hand, in practice it is common to design with a certain ratio. The important thing is to confirm that the input ratio matches the project's design policy.

When entering equipment configurations, be careful not to mix up units. Because similar numbers such as kilowatts, kilowatt-peak, number of panels, number of circuits, and number of PCS units appear together, it’s easy to enter values into the wrong fields on a first use. In particular, take care not to confuse the output per panel with the total capacity of all panels. After entering data, check the total capacity and configuration warnings displayed on the screen and review whether any values look unnatural.

Also, in practice equipment specifications may change midway. If candidate panels or PCS are changed, it is useful to create patterns with different conditions within the same project so you can compare the results. Even when using PVSyst for the first time, don’t stop with just one set of conditions; try patterns that slightly vary capacity and configuration to make it easier to understand which items affect the results.

Precautions when setting azimuth and tilt angle

When considering the energy production of a photovoltaic power system, azimuth and tilt angle are very important parameters. The azimuth indicates which direction the panels face, and the tilt angle indicates how much the panels are inclined relative to the horizontal plane. In PVSyst, correctly setting these parameters allows the simulation to reflect how solar irradiance is received seasonally.

What beginners often stumble over is correctly matching the orientation shown on the drawings with the azimuth settings in PVSyst. If you enter data without checking whether the drawing’s north, the site’s orientation, and the orientation of the panel rows all align, the simulated energy yield may differ from the actual one. Especially when manually entering data while looking at the layout plan, confirm the azimuth reference and be careful not to mix up east, west, south, and north.

For tilt angles, it is important not only to enter the angle shown on the design drawings as-is, but also to confirm whether that angle refers to the racking/mounting frame angle or the terrain’s slope angle. It is relatively straightforward on flat ground, but on sloped terrain the ground slope, the racking angle, and the panel surface angle can be confused. Understand what the angle used in the simulation represents and align it with the actual site conditions.

Azimuth and tilt affect not only energy generation but also shading and layout. If the spacing between panel rows is narrow, shadows from the front row can fall on the rear row during periods of low solar altitude. Rather than simply choosing the angle that maximizes annual energy generation, it is necessary to consider site conditions, constructability, maintainability, and the occurrence of shading. The purpose of using PVSyst is not merely to produce the highest generation number, but to grasp a reasonable energy yield under realistic design conditions.

Basic operations for handling shadow effects

One of the items that beginners often find difficult when learning how to use PVSyst is configuring the effects of shading. In photovoltaic power generation, shadows cast by surrounding buildings, trees, utility poles, mountains, adjacent rows of panels, and so on can reduce energy output. How detailed the shading effects should be modeled varies by project, but in practice it is an important factor that cannot be ignored.

If you are using PVSyst for the first time, first understand that shadow settings are broadly divided into shadows from surrounding obstacles and shadows between panels. Shadows from surrounding obstacles are the effects of buildings, trees, and other features around the site that block sunlight. Shadows between panels are the effects caused by row spacing, panel height, and tilt angle. Both affect energy production, but the input information required is different.

What is important in shadow settings is how accurately you can understand the on-site conditions. Desk drawings alone may not reveal the actual heights of trees, the rise of buildings, or differences in ground elevation. Therefore, in practice it is desirable to organize on-site survey photographs, survey data, simple layout information, and the heights of surrounding obstacles before reflecting them in PVSyst.

When a beginner is learning the basic operations in one day, it isn’t necessary to perfect the detailed shadow settings. However, you should check where the screen for configuring shadows is and what information needs to be entered for it to affect the results. If you temporarily set up a simple obstacle and compare the results with and without shadows, you can get an intuitive sense of the impact of shadows.

Shading settings are useful not only for estimating energy production but also for improving the design. For example, they can lead to decisions such as widening row spacing, slightly altering the layout, or reducing the number of panels in areas close to obstacles. The value of using PVSyst lies not only in producing results but in allowing you to explore better designs by varying the conditions.

Considerations When Entering Loss Conditions

In PVSyst, various loss conditions are set when calculating energy production. Losses are the concept used to subtract the reduction factors that occur in actual installations from the energy that would be obtained under ideal solar irradiance. Typical examples include output reduction due to temperature, wiring losses, equipment conversion losses, soiling losses, mismatch, degradation, and shading losses.

The reason beginners get stuck on loss settings is that there are many items and it’s hard to judge which values to set and to what extent. However, there’s no need to fine-tune every item from the outset. First, check the standard approach provided by PVSyst, and then realistically focus on reviewing only the losses that are likely to be particularly important for the project.

When inputting loss conditions, the important thing is not to use unsubstantiated optimistic values. If you set losses too low to inflate projected power generation, the results are likely to diverge from actual performance later. Conversely, entering overly conservative values can make assessments of project viability unnecessarily strict. In practice, it is important to set explainable values based on design conditions, site environment, maintenance plans, and equipment specifications.

Of particular concern are losses related to soiling, snow accumulation, and the surrounding environment. In arid regions, locations with a lot of dust, sites near agricultural land, locations close to the sea, and snowy regions, the reduction in power generation can be greater than under typical conditions. The assessment of losses also changes depending on the frequency of maintenance inspections and cleaning. Rather than relying solely on PVSyst operations, it is necessary to consider both the on-site conditions and the operational conditions together.

Loss conditions are among the parts of simulation results most likely to require explanation. To be able to explain later why you chose those values, record the settings and their rationale. Even if it’s your first time using PVSyst, simply adopting this habit will significantly improve the quality of documents usable in professional practice.

Workflow for Running Simulations and Reviewing Results

Once you've entered the basic conditions, it's time to run the simulation. If you're not yet familiar with operating PVSyst, you may feel uneasy before pressing the Run button, but you can change the conditions and try the simulation as many times as you like. What’s important is to review all input conditions once before running and confirm there are no obvious input errors.

Before running the simulation, check the site, meteorological data, system capacity, azimuth, tilt angle, loss conditions, and shading conditions. In particular, beginners often make mistakes such as the capacity being much larger than expected, the azimuth being reversed, the tilt angle set to an extreme value, or the meteorological data coming from a distant location; get into the habit of verifying the consistency of input conditions before reviewing the simulation results.

When you run the simulation, it displays the annual generation, monthly generation, the breakdown of losses, and so on. What you should look at first is not just the annual generation figure. It is important to check whether the monthly generation trends look natural, whether the difference between summer and winter matches the regional conditions, and whether there are any extreme items in the loss breakdown. If you judge based only on the total generation, it becomes easy to overlook input errors.

When verifying results, the performance ratio is also an important indicator. The performance ratio is used as a measure of how efficiently the system is generating power compared with ideal conditions. It is not simply a matter of higher values being better; you need to evaluate it while checking consistency with loss conditions and design conditions. If the performance ratio is extremely high or low, recheck the input conditions for any errors.

A simulation should not be treated as a one-time run; it is a process of comparing results under different conditions. Comparing outcomes when the angle is changed, when capacity is varied, when shading is taken into account, or when loss assumptions are reviewed will yield information useful for design decisions. When learning the basic operations of PVSyst, the shortcut to understanding is not to produce a single result but to try changing conditions and re-running the simulation several times.

Key Points to Look For When Reading a Report

In PVSyst, you can output simulation results as a report. In practice, this report may be used as the basis for internal review, design studies, stakeholder explanations, and document preparation. Beginners may find the report overwhelming and not know where to look, but if you decide in advance which points to check first, interpreting it is not difficult.

The first thing to check is the project's basic information. Make sure the project name, location, meteorological data, system capacity, azimuth, tilt angle, and so on are as expected. If there are errors here, no matter how clean the results look they cannot be used in practice. When you open a report, it's important to verify the assumptions first rather than jumping straight to the generation figures.

Next, check the annual energy production and the monthly generation. Annual energy production is a representative figure commonly used to evaluate the entire project, but monthly variations are also important. Solar irradiance, ambient temperature, shading, and snowfall can cause differences in generation from month to month. If there are trends that seem inconsistent with regional characteristics, it is necessary to review the input conditions.

Also, review the loss diagram and the breakdown of losses. By seeing at which stage and by how much the power output has decreased, you may identify design improvements. If losses due to shading are large, review the layout and obstacle conditions; if temperature-related losses are large, consider the installation environment and ventilation conditions. If wiring losses are large, the wiring plan and equipment placement should be reconsidered.

A report is not merely a document that shows results; it is also a record of input conditions and design decisions. When using it for submission, organize file names and storage locations so that it is clear under which conditions the report was produced. If multiple reports created under different conditions become mixed together, there is a risk of sharing incorrect documents with stakeholders. From the stage of first using PVSyst, it is important to consider report management as part of the basic operations.

Causes and Solutions for Common Difficulties Beginners Encounter

The reason people using PVSyst for the first time get stuck is less that the operation itself is difficult and more that they proceed through the screens without understanding the meaning of the conditions they need to enter. Because there are many technical terms and numerous input fields, entering numbers without deeply understanding each field’s meaning makes it impossible later to judge the validity of the results.

The most common issue is insufficient verification of location information and meteorological data. Even if you think you have selected a nearby site, the actual site and weather conditions may differ. As a countermeasure, after entering the site settings always check the latitude, longitude, and elevation to see whether they differ significantly from the target site. Also, briefly record the reason you chose the meteorological data—this will make it easier to explain later.

Another common stumbling block is the consistency between system capacity and equipment configuration. If the relationship among the number of panels, the number in series, the number in parallel, and the PCS capacity is not correct, warnings may appear or the results may be unnatural. As a countermeasure, check the total capacity after input and compare it with the capacities on the drawings and design documents. Because unit mix-ups are also frequent, always confirm that the magnitude of the capacity matches what you expect.

Mistakes in entering azimuth and tilt angles are also common. If you enter values without checking the orientation of the drawings and the north direction, the simulation may end up facing a different direction from the actual site. As a countermeasure, verify the north direction on the layout drawing, the panel orientation, and the azimuth reference in the input fields together. For sloped sites, be careful not to confuse the slope of the ground with the tilt of the panel surface.

Also, many people are unsure whether to leave the loss conditions at their default values or adjust them for each project. Initially, it's fine to learn the workflow using standard values, but when using them in practice you should review them to match local site conditions and design parameters. Rather than fine-tuning every loss, it's more efficient to check the items that have the greatest impact on energy production first.

Organizing On-site Information to Improve Accuracy in Practical Work

Simply learning to operate PVSyst is not enough to produce simulations that can be relied on in practical work. Improving the accuracy of predicted energy production depends on how precisely site information can be gathered and organized. Even for photovoltaic systems with the same capacity, energy production varies depending on the installation site, terrain, surrounding environment, shading, and installation conditions. PVSyst is a powerful simulation tool, but if the input data are insufficient, the accuracy of the results will be limited.

The first items to organize as site information are the site's location and shape. Latitude and longitude, elevation, site boundaries, orientation, and ground slope form the basis of the design conditions. In particular, when the terrain has changes in elevation, it is difficult to accurately judge panel placement and shadow impacts from plan views alone. Understanding the site's elevation and slope information increases the validity of the conditions entered into PVSyst.

Next, organize information on surrounding obstacles. Buildings, trees, slopes or embankments, utility poles, fences, and nearby equipment can all be potential causes of shading. Knowing their heights, positions, and distances makes it possible to assess shading impacts in a way that is closer to reality. Because photographs alone can sometimes make it difficult to accurately determine heights and spatial relationships, it is effective to combine them with positioning information or simple surveying results.

Additionally, organizing site photographs is important. Site photographs are useful for confirming design conditions and explaining things to stakeholders. However, if you simply store a large number of photos, you can lose track of where and in which direction each was taken. Managing them so that the shooting location and direction, time, and subject are clear makes them easier to use later when reviewing PVSyst settings.

In practice, it is important to treat PVSyst simulations and on-site surveys as an integrated process rather than separate activities. Verifying results produced under desktop conditions at the site, and reflecting site-acquired information back into the simulations, improves the reliability of the design. Especially when progressing from preliminary studies to detailed design, accurately obtaining site location and elevation data and using them to assess shading and layout is essential.

Summary

For someone using PVSyst for the first time who wants to learn the basic operations in as little as one day, it is more important to experience the overall workflow—from creating a new project to running a simulation and checking the report—than to try to understand every function in detail. By reviewing the basic items in order—site information, meteorological data, system capacity, azimuth, tilt angle, shading, and loss conditions—you can understand how to use PVSyst step by step.

The initial goal is not to create a perfect simulation, but to grasp which settings are made on which screens and how those conditions relate to energy production. If you record the input conditions, check the assumptions in the results report, and become able to compare the differences caused by changing conditions, you will have built a sufficient foundation for using PVSyst in practical work.

On the other hand, to make practical use of PVSyst results, the accuracy of on-site information is also indispensable. Power generation simulations lead to more reliable assessments when combined not only with desk-based figures but also with field information such as site location, topography, surrounding obstacles, shading, and photographic records. In particular, for the layout and shading studies of photovoltaic installations, it is important to accurately determine the on-site coordinates, heights, and positions of obstacles.

If you want to efficiently organize position information collected in the field, using an iPhone-mounted GNSS high-precision positioning device such as LRTK can help improve the accuracy of site surveys and work efficiency. If you can link and manage survey points on the site, surrounding obstacles, photo capture locations, and so on with high-precision position information, it can help verify the conditions set in PVSyst and assist with stakeholder briefings after design. After you learn the basic operations of PVSyst, improving the quality of the information gathered on site will make simulation results more practical and easier to use.