How to Read the PVSyst Manual｜Organized into 7 Frequently Used Screens

Table of Contents

• The PVSyst manual is easier to understand when read screen by screen.

• Frequently used screen 1: Set up prerequisites on the project creation screen

• Frequently used screen 2: Confirm the basis for power generation on the weather data screen

• Frequently used screen 3: Read the installation conditions on the azimuth and tilt angle settings screen

• Frequently used screen 4: Check modules and inverters on the system design screen

• Frequently used screen 5: Organize shading conditions on the Nearby Shadows and Distant Shadows screens

• Frequently Used Screen 6：Interpreting the elements that affect results on the Loss Settings screen

• Frequently used screen 7: Check the report on the simulation results screen

• Points to note when reading the PVSyst manual

• Summary

The PVSyst manual is easier to understand when read screen by screen

When people start reading the PVSyst manual, many initially stumble over the large number of functions and find it hard to decide where to begin checking. In photovoltaic generation simulations, multiple conditions combine to produce the final result, such as meteorological data, installation angle, modules, inverters, shading, losses, and reports. For that reason, simply reading the manual from beginning to end in order can make it difficult to see which screens should be prioritized in practical work.

To read the PVSyst manual efficiently, it is useful to organize the role of each screen. By identifying what settings are determined on each screen and how those settings affect energy production, loss rates, performance ratio, and monthly energy yield, you can understand it not merely as an operational guide but as a way to interpret the simulation conditions.

Especially for beginners, PVSyst is often perceived as "software where you input numbers and see the results," but in fact it is important to view it as a design-support tool for verifying the consistency of the assumptions. Reading each input screen with an awareness of what the setting is for, which items strongly influence the results, and where they are reflected in the report will greatly change your understanding of the manual.

This article organizes the screens you’ll use most when reading the PVSyst manual into seven sections. We walk through, in order, the pages you check most often in practice: project creation, meteorological data, installation conditions, system design, shading analysis, loss settings, and simulation results. Aimed at readers who are not yet familiar with PVSyst operation, the article focuses on practical verification points so you’ll know which screen to read and from what perspective.

The purpose of reading the PVSyst manual is not just to memorize screen names and button locations. The most important thing is to be able to explain the analysis conditions. If you can explain why you used this weather data, why you chose this tilt angle, why you selected this inverter capacity, and which losses you anticipated and to what extent, the credibility of the simulation results will increase. Conversely, if you cannot explain the rationale for the input values, no matter how polished the report looks, it will be less persuasive in design reviews, internal approvals, and when explaining the project to the client.

The PVSyst manual is more practical to use as a map for checking the assumptions of a power generation simulation than to read merely as an operating manual. If you familiarize yourself with the seven screens introduced below, it will be much easier in typical projects to determine what to check, where to make decisions, and what to review.

Frequently Used Screen 1: Prepare Prerequisites on the Project Creation Screen

When reading the PVSyst manual, the first thing to grasp is the project creation screen. Power generation simulations do not start by immediately configuring modules or inverters; they begin by deciding the assumptions for the entire project. On the project creation screen you organize the foundational information for the whole simulation, such as the location, system type, analysis target, meteorological data to be used, and the project name.

When reading this screen, it is important not simply to follow the steps to create a new project, but to understand which information will be carried over to subsequent screens. For example, setting the site information will affect the selection of meteorological data, the solar altitude, and assumptions regarding monthly solar irradiation. Choosing the system type—grid-tied, self-consumption, or off-grid—will change the items you need to enter later and the contents of the reports you should review.

In the PVSyst manual, understanding the relationship between a project and its variants is also important. A project represents the overall scope of a case, and it is easier to understand if you think of a variant as a design option to be compared within that project. Evaluations such as changing the tilt angle on the same site, changing module capacity, altering inverter configuration, or varying shading conditions are easier to compare when managed as separate variants.

Beginners often get confused about managing project names and design proposal names. If you proceed using only the project name, later when comparing multiple proposals it can be hard to tell under which conditions each simulation was run. For this reason, defining a naming convention at the time of project creation that indicates the location, whether it is rooftop or ground-mounted, the capacity scale, and the stage of consideration will make later-stage verification easier.

Also, on the project creation screen, the accuracy of the target location settings is important. Solar power output varies with solar irradiance, temperature, orientation, and the surrounding environment. Selecting a nearby point at the prefecture or municipality level can provide a rough estimate, but in practice it is desirable to use meteorological conditions as close as possible to the installation site. In particular, in mountainous areas, coastal areas, snowy regions, basins, and urban rooftops, meteorological conditions may differ greatly even at nearby locations.

When reading the PVSyst manual, you should not treat the project creation screen lightly as an "entry screen"; rather, you need to view it as an important screen that determines the consistency of the analysis conditions. If the assumptions set here are vague, no matter how detailed you later set the modules and losses, it will be difficult to explain the results.

In practice, it is useful to also record the items you confirmed on the project creation screen in internal review documents and design notes. If you record which location you selected, which system type you used for the analysis, and which variants you compared, it will be easier to reproduce the conditions when you review the report later. Because PVSyst’s analysis results naturally change when input conditions change, accurately setting the assumptions on the initial screen is the first step toward a reliable simulation.

Frequently Used Screen 2: Check the Basis of Power Generation on the Weather Data Screen

The next important item in the PVSyst manual is the meteorological data screen. In solar power generation simulations, solar irradiance and air temperature have a major impact on the results. Which module you choose and at what tilt you install it are also important, but if the meteorological data you input in the first place are not appropriate, the estimated energy production itself will deviate from reality.

On the weather data screen, check the monthly solar irradiation and ambient temperature for the site, and, where applicable, conditions such as wind speed and humidity. When reading the PVSyst manual, you need to be aware not only of the procedure for importing weather data but also of what period the data’s averages represent, which location they represent, and how the conversion to horizontal-plane and tilted-plane irradiation is handled.

In practice, the key thing to confirm is whether the meteorological data being used aligns with the project's objectives. During the preliminary assessment stage, representative meteorological data may be used to grasp approximate power generation. However, when the data will be used for investment decisions, materials for financial institutions, long-term revenue-and-expenditure studies, EPC proposals, or verifying the profitability of a power generation business, it is necessary to more carefully verify the basis for the meteorological data.

The PVSyst manual explains how to import and select meteorological data, but the point practitioners should focus on is not "use it because you can choose it" but "why you are using that data." Even data from a nearby location can lead to differences in estimated power generation if there is a large elevation difference or if meteorological patterns differ between coastal and inland areas. Especially in snowy regions, fog-prone areas, or areas influenced by mountains, it is safer not to judge solely by distance.

On the weather data screen, it is also important to examine monthly trends. Even when annual generation looks fine, a month-by-month check can show that winter solar irradiance is overestimated or that summer temperature conditions appear lower than they actually are. In solar power generation, higher ambient temperatures tend to raise module temperature and cause output to decline, so you should check temperature as well as solar irradiance.

Furthermore, meteorological data also influence comparisons of design conditions. For example, even with the same system capacity, annual energy production varies between regions with high and low solar irradiance. Moreover, at the same irradiance, regions with higher ambient temperatures tend to incur greater temperature losses. Therefore, when reading the PVSyst manual, it is important to understand the meteorological data screen not merely as an input form but as the screen for checking the foundation of the generation forecast.

What beginners tend to overlook is how to describe the selected meteorological data in the report after choosing it. When presenting PVSyst results to a third party, you need to be able to explain which meteorological data were used, which location the data represent, and why that data was chosen. If, from the stage of reading the manual, you check where the on‑screen settings will be reflected in the report, later explanations will go more smoothly.

Correctly reading the meteorological data screen is extremely important for mastering PVSyst. The accuracy of power generation simulations is greatly influenced by the validity of the input data. When studying the manual, be sure to understand not only how to operate the software but also the rationale for selecting data, how to check monthly trends, the consistency with site conditions, and the explanatory clarity required in reports.

Frequently Used Screen 3: Read installation conditions on the azimuth and tilt angle settings screen

The third screen commonly used in the PVSyst manual is the screen for setting the azimuth and tilt angles. In solar power generation, the amount of solar irradiance received varies depending on which direction the panels face and at what angle they are installed. For that reason, this screen is one of the central configuration screens for power generation simulation.

Azimuth indicates the direction the module surface faces. The tilt angle indicates the angle at which it is installed relative to the horizontal plane. In general, south-facing designs with an appropriate tilt for the region tend to be advantageous in terms of power generation, but in actual projects there are various constraints such as roof shape, site configuration, racking conditions, snowfall, wind loads, constructability, shading, and maintenance access.

When reading the PVSyst manual, it is important not only to learn how to input the azimuth and tilt angles but also to understand how they affect solar irradiation calculations. For example, in rooftop projects the existing roof pitch and azimuth are often effectively fixed, so you may not be able to adjust them to the ideal angles. On the other hand, in ground-mounted projects the racking design allows you to choose the tilt angle to some extent, so you comprehensively evaluate annual energy yield, winter generation, wind effects, row spacing, earthworks, and similar factors.

What you should be careful about on this screen is not to pursue only the angle that maximizes energy production. In PVSyst simulations, a certain tilt angle may appear to yield higher annual energy production. However, increasing the tilt angle can increase inter-row shading, increase wind loads, raise racking costs, or reduce the number of modules that can be installed. Conversely, decreasing the tilt angle can make it easier to increase the number of modules installed, but it can affect soiling and drainage, snow accumulation, and energy production at low solar elevations.

When reading the PVSyst manual for practical work, it is appropriate to view the azimuth/tilt screen not as a tool for maximizing energy production but as a screen for checking the balance between installation conditions and energy production. In particular, when comparing design proposals, it is easier to make decisions if you separate variants and compare, for example, a proposal that changes only the angle while keeping the same module capacity, a proposal that prioritizes the number of modules installed, and a proposal that emphasizes winter generation.

A point that often confuses beginners is the sign and reference of azimuth. Depending on the software, azimuth may be represented with south as the reference and east/west shown as plus/minus, or with north as the reference and measured clockwise. When reading the PVSyst manual, always check what the on-screen azimuth is referenced to. If you get this wrong, you might, for example, enter a west-facing orientation when it is actually east-facing, which can lead to large differences in the generation pattern.

In roof-mounted projects, handling multiple surfaces is also important. For east–west roofs, north–south roofs, multiple buildings, or complex roof geometries, you may not be able to represent everything with a single azimuth and tilt angle. In such cases, you need to decide whether to separate the conditions for each surface or to treat them as representative conditions. When reading the PVSyst manual, check how to set up multi-orientation systems and how detailed the separation should be, as this will be useful for practical work on rooftop projects.

Also, azimuth and tilt angle are items frequently seen in report descriptions. If power generation is lower than expected, the first things to check are meteorological data, equipment capacity, shading, losses, and the installation angle. Therefore, the values entered on this screen should be recorded so they can be explained later. Cross-check them against design drawings, layout plans, roof plans, racking drawings, and on-site photos to confirm that the settings on the screen match the actual installation conditions.

As a way of reading the PVSyst manual, it is important to treat the azimuth and tilt settings screen as the fundamental screen that determines the directionality of the energy yield. If you understand the meaning of the values, the sign conventions, how multiple surfaces are handled, and the relationship with design constraints, it will be easier to explain why the simulation results produced that energy yield.

Frequently Used Screen 4: Confirm Modules and Inverters on the System Design Screen

The fourth screen frequently referenced in the PVSyst manual is the System Design screen. On this screen you set the framework of the power generation system — including photovoltaic modules, inverters, string configuration, the number of series and parallel connections, system capacity, and the DC/AC ratio — making it a crucial screen that directly ties simulation results to actual design conditions.

When reviewing the system design screen, the first thing you should check is whether the selected modules and inverters actually match the equipment you intend to use. You need to verify not only the manufacturer and model number, but also the rated output, voltage, current, temperature characteristics, the inverter's input range, maximum input voltage, number of MPPTs, and rated AC output. Avoid selecting a model unconditionally just because there is a similar part number in the database.

The PVSyst manual explains how to select modules and inverters, how to use the database, how to edit equipment data, and so on. However, what is important in practice is whether the chosen equipment specifications are consistent with the design drawings, quotation conditions, and manufacturer datasheets. In particular, a module's nominal maximum power and temperature coefficient, and an inverter's input voltage range affect not only the energy yield but also the feasibility of the design.

String configuration is also an item that must be checked on the system design screen. If the number of modules in series per string is too small, it may be difficult to meet the inverter’s operating voltage range. Conversely, if the number of modules in series is too large, the open-circuit voltage at low temperature may exceed the maximum input voltage. In PVSyst you can proceed with the design while checking such electrical compatibility, but when reading the manual it is important to understand the meaning of warnings and errors.

The DC/AC ratio is also a parameter commonly checked in practice. How large to size the inverter capacity relative to the module capacity affects energy production, peak shaving, equipment costs, and operational policy. Designing the DC side slightly larger makes it easier to increase energy production under low irradiance, but during high irradiance clipping can occur due to the inverter's output limit. On the system design screen, you need to check this capacity balance and evaluate it together with the loss items in the simulation results.

When reading the PVSyst manual, it is important to understand the system design screen not only as a "screen for selecting equipment" but also as a "screen for checking whether the configuration is electrically valid." The combination of modules and inverters is not sufficient simply because the total capacity matches. You need to check string voltage, current, MPPT allocation, oversizing ratio, temperature conditions, and the effects of shading.

Also, when dealing with multiple inverters or arrays with multiple orientations, interpreting the system design screen becomes even more important. On east–west roofs or multi-faced roofs, whether you connect strings of different orientations to the same inverter or separate MPPTs by orientation can affect energy production and mismatch losses. When reading the manual, reviewing the settings for multiple sub-arrays and the MPPT strategy will help with practical decision-making.

What beginners often overlook is trusting equipment database values too much. The information registered in the database may be outdated, or there may be manufacturer specification updates, different model numbers, or regional specification differences. Therefore, for important projects, you should cross-check against the manufacturer's specification sheet and be prepared to verify the data as needed. When reading the PVSyst manual, you need to be aware not only of how to use the database but also of the responsibility to verify input data.

The System Design screen is the part of the power generation simulation that requires the most practical judgment. If the settings here are appropriate, subsequent loss analysis and report checks will proceed smoothly. Conversely, if module or inverter conditions are entered incorrectly on this screen, the overall reliability of the results will decrease. When reading the PVSyst manual, be sure to understand the meanings of module, inverter, string, capacity ratio, and warning displays together.

Frequently Used Screen 5: Organize Shading Conditions on the Nearby Shadow / Distant Shadow Screen

The fifth screen that many practitioners check in the PVSyst manual is the shading screen. In solar power generation, when solar irradiance is blocked by surrounding buildings, trees, utility poles, mountains, adjacent array rows, etc., power output decreases. In PVSyst, you can set near and far shading conditions and evaluate losses caused by shading.

When reading the shading settings screen, what matters is not treating shading simply as a reduction rate but understanding the time of day it occurs, the season, and the extent of the area affected by the shade. For example, shade that occurs only on winter mornings has a very different impact on power generation than shade that occurs during daytime throughout the year. Also, when shade falls on part of an array, you cannot simply judge losses by the area ratio alone, because string configuration and the effect of bypass diodes can cause partial shading to lead to greater losses than expected.

The PVSyst manual explains the creation of surrounding objects, the setup of 3D scenes, horizon profiles, and methods for calculating shadows. These are areas that can feel difficult for beginners, but they are very important in practical work. In particular, for rooftop installation projects, surrounding buildings, roof penthouses, parapets, HVAC equipment, antennas, and railings can cause shading. For ground-mounted projects, you check shading between array rows, surrounding trees, elevation differences of developed land, and nearby structures.

On the Near Shading screen, the accuracy of the 3D model affects the results. If you make the model overly detailed, the work time increases, but if you omit structures that are the main causes of shading, you risk underestimating losses. When reading the PVSyst manual, it’s easier to apply it in practice if you review it while considering what level of accuracy you should use to input objects and how to prioritize the elements that have the greatest impact.

On the distant shading screen, check the horizon obstruction caused by mountains and terrain. In particular, in mountainous areas and valley topographies the sun in the morning and evening can be hidden by the terrain, which may affect the start and end times of power generation. On flatlands and in urban areas the effect of distant shading may be small, but in regions with nearby mountains it can be significant and should not be ignored. When reading the PVSyst manual, it is advisable to be able to determine which projects require distant shading analysis and which do not.

What you need to watch out for in shadow settings is insufficient verification of on-site conditions. Even if drawings seem fine, shadow conditions can change in reality due to the height of adjacent buildings, tree growth, buildings planned for future construction, changes in the placement of equipment, and so on. The information you can enter on PVSyst's screen is only based on the given conditions. You should use site surveys, photographs, survey data, layout plans, architectural drawings, drone photos, etc., to confirm that the shadow conditions shown on screen are close to the actual situation.

Shading losses are also an item that is often checked in reports. When energy production is low, the magnitude of shading losses is always examined. From the stage of reading the PVSyst manual, it is important to be able to trace which shading conditions were set and what level of losses resulted. If you configure shading settings, don’t just build the model—make sure you can explain why you chose that particular shape, height, and position.

The near-field and far-field shading screens in PVSyst are screens that require both operational skill and judgment. When reading the manual, it is important not only to follow the 3D operation procedures, but also to understand the impact of shading on power generation, the consistency with site conditions, the approach to model accuracy, and how to explain these points in reports.

Frequently Used Screen 6: Interpreting the Elements on the Loss Settings Screen That Affect Results

The sixth screen you should be sure to understand in the PVSyst manual is the Losses Setup screen. In an energy yield simulation, various losses are subtracted from the energy obtained under ideal irradiance conditions to estimate a more realistic energy yield. Because the Losses Setup has a large impact on simulation results, you should pay particular attention to it when reading the manual.

Losses include various types, such as temperature loss, wiring loss, mismatch loss, soiling loss, incidence-angle loss, inverter loss, clipping loss, shading loss, and long-term losses that account for degradation. In PVSyst, these can be set and checked item by item, but for beginners it can be difficult to understand what each loss means.

When reading the loss settings screen, it is important not only to memorize each loss individually but also to organize which losses originate from input conditions, which stem from design decisions, and which arise from the operating environment. For example, temperature loss is related to meteorological conditions, installation methods, and module characteristics. Wiring loss is related to cable length, cross-sectional area, and electrical design. Soiling loss is related to the surrounding environment and cleaning frequency. Mismatch loss is related to variations in module characteristics and string configuration.

The PVSyst manual explains how to configure each loss component, but in practice you need to decide whether it is acceptable to use the standard values as-is. At the preliminary estimation stage it may be acceptable to use typical values, but for detailed design and investment decisions a review tailored to the project's characteristics is required. For example, in areas with high dust levels, where bird damage is expected, in regions with snowfall, close to the coast, in high-temperature areas, or for projects with poor attic ventilation, loss conditions should be examined more carefully.

Temperature loss is one of the losses commonly observed in photovoltaic power generation. When modules receive solar radiation their temperature rises, and output decreases as temperature increases. The way module temperature rises differs between installations mounted flush to a roof and those on ground-mounted racks with ventilation. When reading the PVSyst manual, make sure you understand how the temperature model and installation configuration settings affect energy production.

Wiring losses are also important in practical work. When cables are long, currents are high, or cross-sectional area is small, electrical losses increase. In PVSyst these may be set as a fixed loss rate, but in actual designs you need to verify that this aligns with the single-line diagram, cable routes, junction boxes, and the locations of power conditioners. When reading the manual, it's helpful to be aware of whether the input values have an explainable relationship with the design drawings.

Soiling losses are greatly affected by the operational environment of each project. The way soiling accumulates differs for urban roofs, factory roofs, areas near farmland, regions with frequent wind-blown dust, places with many birds, and locations with fallen leaves. Rain can naturally wash some of it away, but soiling tends to remain when the tilt is shallow or when cleaning is not performed for long periods. In the PVSyst manual, it is important to check the configuration method and consider it together with the actual operation and maintenance conditions.

On the loss settings screen, what you should avoid is generating results while leaving all items at their default values without a thorough review. Default values are not necessarily incorrect, but when the settings are used in project briefing materials you must be able to explain why those values were chosen. In particular, in materials related to power generation guarantees or profitability assessments, the validity of the loss assumptions may be questioned.

When reading the PVSyst manual, treat the loss settings screen not as a tool for tweaking results but as a means of reflecting actual generation conditions. Setting losses too low will make the estimated energy yield look high, but it risks producing an unrealistically optimistic result. Conversely, overestimating losses can lead you to underrate a project's profitability. The important thing is not optimism or pessimism, but well‑justified parameter settings.

Frequently Used Screen 7: Review Reports on the Simulation Results Screen

The screen I want to cover last in the PVSyst manual is the simulation results screen. Here you can review the annual energy production, monthly energy production, performance ratio, breakdown of losses, system output, graphs, reports, and other items calculated based on the input conditions. The purpose of using PVSyst is ultimately to interpret these results and apply them to design decisions and explanatory materials.

When reading a simulation results screen, it's important not to look only at the annual energy production. Annual energy production is an easy-to-understand metric, but that number alone cannot tell you why the result occurred. By checking monthly energy production, irradiance, temperature losses, shading losses, inverter losses, performance ratio, clipping losses, and so on together, you can assess the validity of the results.

When reading the PVSyst manual, it is easier to understand if you keep in mind which input screen each item in the report originates from. For example, the selection of meteorological data is reflected in solar irradiance and temperature. Azimuth and tilt angles relate to irradiance on tilted surfaces. The module capacity and inverter configuration on the system design screen affect energy production and clipping. Shading settings are reflected in shading losses, and the loss settings screen is reflected in the loss diagram.

What you should especially check in the simulation results is the loss diagram. By looking at the loss diagram, you can see, from the theoretical input energy, at which stages and to what extent losses occur and how they lead to the final output. Reading this lets you understand why the energy production is high or low and identify areas with room for improvement. When reading the PVSyst manual, it is important to connect each item in the loss diagram to the corresponding settings screens in the previous steps.

The performance ratio is also a commonly used metric. It is used as an indicator of how efficiently an installation generates electricity under solar irradiance conditions. However, judging performance solely by the performance ratio is risky. It can vary with meteorological conditions, temperature conditions, system design, shading, loss settings, and other factors, so when comparing with other projects you need to confirm differences in the underlying assumptions.

Checking monthly generation is also important. Even if the annual generation is reasonable, unnatural patterns in the monthly trends can prompt a review of the input conditions. For example, if generation is excessively high in winter, lower than expected in summer, shading losses are large only in certain months, or in a snowy region there is no visible winter impact at all, it is necessary to check the weather data, shading settings, loss settings, and the installation angle.

On the report screen, you should also check whether the information is sufficient to present to third parties. For internal review you can use it together with detailed validation notes, but when presenting to clients, financial institutions, government agencies, contractors, or designers, it is important that the input conditions can be clearly read. When reading the PVSyst manual, it is practical to consider not only the report output procedures but also which items should be used in explanatory materials and what supplementary documents are necessary.

On the simulation results screen, what you should avoid is selecting only the favorable results. When comparing multiple options, the option with the highest power generation is not necessarily the optimal one. You need to make a judgment that includes construction cost, racking conditions, maintainability, grid constraints, roof loading, risk of shading, and future operating conditions. PVSyst results are an important input to design decisions, but they should not alone be used to reach the final decision.

When reading the PVSyst manual, it is effective to use the simulation results screen not as "the screen you look at last" but as "a screen to back-calculate and verify input conditions." If something feels off when you look at the results, return to the screens for meteorological data, installation angle, equipment settings, shading, and losses to check the conditions. By repeating this back-and-forth, you can move closer to a convincing simulation rather than merely producing a report.

Points to Note When Reading the PVSyst Manual

When reading the PVSyst manual for practical use, it is important to be aware not only of the per-screen operation procedures but also of the rationale behind the input values. PVSyst is a multifunctional software, and if you fill in the fields you will get simulation results. However, the reliability of those results depends on the appropriateness and explainability of the input conditions. Being able to operate the software is not the same as being able to analyze it properly.

The first thing to note is not to keep using the initial values as they are. Initial values are convenient, but they are not optimized for every project. Weather data, loss settings, temperature conditions, soiling conditions, wiring losses, and so on should be checked according to the environment and design conditions of each project. Even when using the initial values, it is important to be able to explain why you judged it acceptable to leave them unchanged.

Next, be aware of the connections between screens. Although each screen in PVSyst may appear independent, they are actually closely linked. The location chosen when creating the project relates to the meteorological data; the meteorological data relates to energy production and temperature losses; the azimuth and tilt relate to plane-of-array irradiance; and the system design relates to inverter losses and clipping. Shading and loss settings are also reflected in the final report. If you view individual screens without understanding these connections, it is easy to misinterpret the results.

Also, when reading a manual, it is important to change the scope you focus on depending on your objectives. For an initial rough assessment, simply covering the project, meteorological data, installation angle, system design, basic losses, and annual energy production is enough to proceed with the evaluation. On the other hand, if you are using it for detailed design or investment decisions, you need to carefully check shading, temperature conditions, wiring losses, mismatch, clipping, monthly trends, and the consistency of the reports.

The PVSyst manual can be overwhelming if you try to understand everything at once. Therefore, a practical approach is to first read the screens you use most often and deepen your understanding of necessary items as you progress through projects. In particular, if you master the seven screens—Project creation, Meteorological data, Azimuth & Tilt, System design, Shading, Losses, and Results report—you will be less likely to get lost in most basic projects.

Furthermore, it is important to read PVSyst results with the assumption that you will need to explain them to others. When you are at a stage where only you need to operate the software, work can proceed even with some gaps in understanding. However, when the results are used for customer briefings, internal approvals, or investment decisions, you may be asked why you chose those conditions. Being able to explain the rationale for your settings while referring to the manual at that time will increase the credibility of your materials.

Finally, the PVSyst manual should be used not to make the energy yield appear higher, but to assess projects under reasonable conditions. Simulation results change depending on the input values. If you reduce losses, the energy yield rises; if you downplay shading, the results will look better. However, such outcomes become a risk in practice. The purpose of reading the manual, in addition to learning how to operate the software, is to set appropriate assumptions and make judgments that are close to reality.

Summary

When reading the PVSyst manual, it is more important to organize your approach around the screens you use in practice rather than trying to memorize every function perfectly from the start. In particular, focusing on the seven screens — the project creation screen, the meteorological data screen, the azimuth and tilt setting screen, the system design screen, the near-field shading and far-field shading screens, the loss settings screen, and the simulation results screen — makes it easier to understand the flow of a power generation simulation.

On the project creation screen, you set up the overall project assumptions. On the meteorological data screen, you check the solar irradiance and temperature that form the basis for power generation. On the azimuth and tilt screen, you interpret the relationship between installation conditions and power output. On the system design screen, you check the modules, inverters, string configuration, and capacity ratio. On the shading screen, you organize the shading conditions caused by surrounding buildings and terrain. On the loss settings screen, you check elements that affect the results, such as temperature, wiring, soiling, and mismatch. And on the simulation results screen, you validate the appropriateness of the input conditions while reviewing not only annual generation but also monthly generation, performance ratio, and loss breakdown.

To make effective use of the PVSyst manual, simply memorizing screen names and operation procedures is not enough. It is important to understand how the values set on each screen are reflected in the reports and how they ultimately affect the energy production. By doing so, you will not only be able to operate the software, but will be closer to being able to explain the analysis results.

Simulations of solar power generation tend to draw attention only to the numerical results. However, what truly matters is being able to explain the assumptions from which those numbers were derived. By reading the PVSyst manual screen by screen, it becomes easier to see the connections between input conditions, losses, and energy generation, which also leads to improved quality of design reviews and proposal documents.

If you are just starting to use PVSyst, first prioritize reviewing the seven screens outlined in this article. Even if you are already using it, re-examining the rationale behind the settings on each screen can improve your ability to explain the analysis results. The PVSyst manual is not merely a reference for how to operate the software; it is an important resource for correctly understanding solar power generation simulations and turning that understanding into practical, usable decisions.