7 Key Screens to Understand PVSyst

Table of Contents

• PVSyst becomes easier to read if you first understand the role of each screen

• Point 1 The first screen to grasp the whole project

• Point 2 The screen to confirm meteorological conditions and site location

• Point 3 The screen to decide panel orientation and tilt

• Point 4 The screen to organize the system configuration

• Point 5 The screen to refine the impact of shading

• Point 6 The screen to make loss conditions closer to reality

• Point 7 The screen to interpret results and turn them into decisions

• Understanding how to read the screens makes PVSyst more practical for real work

PVSyst becomes easier to read if you first understand the role of each screen

The reason practitioners new to PVSyst often get stuck is not so much the sheer number of functions, but that it’s initially hard to see which decisions are made on which screen. Power generation simulation software isn’t just about entering numbers and getting results; it’s built on a workflow of sequentially layering assumptions—site, meteorological conditions, equipment configuration, shading, and various losses. If you proceed without understanding the role of each screen, it’s easy to lose sight of which settings you are editing and which values will actually affect the final result.

Conversely, once you can view the main screens by their roles, PVSyst becomes much easier to use. For example, one screen defines the overall framework of a project, another fixes the solar irradiation conditions, and another aligns the loss assumptions with reality. Just by organizing the screens this way, you reduce missed or duplicated inputs and are less likely to misread simulation results.

In practice you often need to compare multiple options quickly or organize the rationale behind results for internal briefings. What matters then is not merely being able to operate the software, but being able to explain which screen and which settings produced the change in results. This article explains the seven main screens you should especially understand in PVSyst. The goal is not to memorize screen names, but to organize a method of reading the screens so you won’t get lost in practical work.

Point 1 The first screen to grasp the whole project

The first screen you should view is the one that organizes the overall framework of the project. At this stage, before refining detailed losses and shading, clarify what project you are examining and under what conditions. The role here is not to deep-dive into individual settings, but to prepare the entry point for the whole simulation. If you keep the project name, basic conditions, and the type of study in mind from the start, subsequent inputs on each screen are less likely to drift.

When looking at this screen, it’s important to decide in advance what within a single project will be fixed and what will be treated as a comparison. For example, whether you want to change only the system configuration at the same site, or compare multiple options including tilt angles and loss conditions, will change how you read the later screens. If this is ambiguous, you may not be able to tell what the differences were when you look at comparison results, which often leads to redoing the study.

From a practitioner’s perspective, this initial screen is useful not just as a starting point but as a checklist for organizing study conditions. Make it easy to recall later under what assumptions this project was run. If you are not yet comfortable with the operations, don’t rush ahead—take this stage to put the project objectives into words while you proceed; it will help you grasp PVSyst’s overall flow.

Also, this screen is important for understanding PVSyst’s basic approach of setting the broad outline first and then moving to details. Instead of diving into the minutiae immediately, build the project’s skeleton first so the roles of subsequent screens naturally connect. Those unfamiliar with PVSyst should treat this first screen not merely as a waypoint but as the place to create an overall map.

Point 2 The screen to confirm meteorological conditions and site location

The foundation of a power generation simulation is the screen that handles site location and meteorological conditions. Here you set where the project is located and what solar irradiation and temperature conditions it will experience. Generation is not determined by equipment performance alone; it is strongly influenced by the received irradiation and temperature conditions, so if your understanding of this screen is weak, no amount of careful equipment configuration later will prevent a mismatch in the underlying assumptions.

When viewing this screen, don’t treat the site input as mere place-name entry. In practice you need to consider how to handle meteorological data near the candidate site, how much to account for differences in elevation and surrounding environment, and whether the data aligns with existing documentation. PVSyst’s numbers may look tidy, but if the underlying meteorological conditions don’t match the project, result reliability falls. Therefore, this is one of the screens to check most carefully as the starting point for generation estimates.

It’s also important not to judge only by irradiation values. In practice, temperature conditions affect module temperature and output reduction, and they interact with wind and installation considerations. Thus, on this screen you should grasp the site’s overall operating environment rather than merely whether the annual irradiation is high or low. This perspective links to later loss settings and system configuration readings; developing a habit of thinking about meteorological conditions in three dimensions helps the PVSyst screens connect from point to point rather than appearing as isolated items.

Additionally, during internal or client explanations you may be asked why you adopted certain conditions. If you understand how to read this screen, it’s easier to explain that you didn’t just input values arbitrarily, but set assumptions appropriate to the project. When the person operating PVSyst and the person judging the results are different people, carefully grasping this screen helps prevent rework downstream.

Point 3 The screen to decide panel orientation and tilt

In solar PV simulation, panel orientation and tilt greatly affect the received irradiation. Therefore, the screen where you set azimuth and slope is more important than it might appear. This screen’s role is to simplify installation conditions and decide the basic configuration—whether it’s roof-mounted or ground-mounted, and roughly what tilt to take. Because these settings directly affect generation, you should read them with the installation intent in mind, not just the numerical values.

An important point when reading this screen is to understand that the theoretically optimal angle is not always practically adoptable. In practice, site constraints, constructability, racking limitations, and surrounding shading often lead you to prioritize realistic values over theoretical optimums. Settings in PVSyst that produce high generation are meaningless if they cannot be implemented on site. Thus, this screen should be used not to simply maximize output but to understand generation characteristics within feasible conditions.

Also, tilt and azimuth settings relate to subsequent shading and loss conditions. Changing the angle affects not only the received irradiation but also how inter-row shading appears, soiling tendencies, and even equipment configuration approaches. Therefore, don’t view this screen as an isolated setting; consider how it connects to later screens to deepen your understanding. Although PVSyst screens may look independent, they actually influence one another.

Beginners tend to treat this screen as merely where you input angle numbers. In practice, however, it’s a place to reflect project design intent. Whether you prioritize maximizing generation, aligning with equipment layout, or balancing maintainability will change the meaning of the chosen settings. As you become more familiar with PVSyst, this screen will appear less like a numerical input form and more like a place to organize design decisions.

Point 4 The screen to organize the system configuration

The system configuration screen is one of the most practice-oriented parts of PVSyst. Here you concretize how the power plant will be assembled—number of modules, string layout, input circuits, and so forth. If site and meteorological conditions are the external assumptions, this screen decides the internal makeup of the equipment. Therefore, you need to check not only component selection but also whether the design conditions are actually met.

When reviewing this screen, it’s important to carefully confirm not only generation but also whether the electrical configuration is feasible. Even if the simulation runs, in practice you must verify the design with temperature and operational conditions in mind. If the entered module counts or wiring details differ from the actual construction plan or operating conditions, you risk performing a study that is detached from reality. Read PVSyst with an awareness of configuration validity.

This screen is also well suited for comparing multiple options. Even with the same site and tilt, changing string configuration or how you size capacity can change output characteristics and how losses manifest. Therefore, use this screen to understand differences by condition rather than to search for a single correct answer. Whether PVSyst becomes a mere calculation tool or a means of preparing decision-making materials depends on whether the practitioner uses this comparative perspective.

As you get used to this screen, it becomes easier to give meaning to numbers in the result screens. For example, if a certain loss appears large, you can more easily separate whether it stems from external environment or from how the system configuration was sized. To master PVSyst, don’t just chase the result screens—always keep in mind what you decided on the system configuration screen.

Point 5 The screen to refine the impact of shading

Shading is one of the elements that often causes significant differences in generation estimates. The screen that handles shading reflects real-world illumination losses—surrounding obstacles and inter-row shading—more realistically. Even if installation conditions look favorable, optimistic assumptions about shading can lead to overestimated annual generation. Therefore, understand this screen not as a way to reduce generation arbitrarily, but as a correction screen to bring the plan closer to on-site reality.

When using this screen, avoid lumping shading into a single number. Shading varies by season, time of day, and direction, and shaded objects can be external to the site or internal to the installation. The purpose of modeling shading in PVSyst is not merely to input a loss rate but to verbalize during the design stage where and how shading may occur. Practitioners who carefully model shading tend to read results more consistently.

Also, shading settings shouldn’t always be as detailed as possible. The required accuracy differs between preliminary and detailed studies. In early stages prioritize a rough understanding; in detailed stages focus on key areas. Always be aware of the study phase when reading PVSyst screens to avoid spending unnecessary effort or, conversely, failing to examine things in sufficient detail.

On actual sites, shading issues are sometimes not fully captured by drawings. Surrounding trees, terrain undulations, and the positions of existing structures often reveal conditions only during site visits. Thus, treat this screen not just as an input field but as the place to think about how to translate field information into the simulation. Those who understand PVSyst view the shading screen not as number-tweaking but as a window that connects site reality with design.

Point 6 The screen to make loss conditions closer to reality

To make PVSyst results useful in practice, how you treat loss conditions is indispensable. The losses screen incorporates realistic losses that do not occur under ideal conditions—wiring, temperature, mismatch, soiling, operational constraints, and so on. If this screen is too rough, the results may look neat but lack real-world relevance; if you are overly conservative, you may draw excessively cautious conclusions. That’s why you must read this screen carefully.

An important way to read this screen is to distinguish the meanings of each loss rather than just summing them up. For example, some losses strongly depend on how equipment is placed, while others relate to construction quality or maintenance practices. Treating everything as a uniform coefficient blurs the distinction between what can be improved and what should be accepted as a premise. In practice, this breakdown directly affects design improvements and accountability in explanations.

Loss settings are also where you see the project’s temperature—metaphorically speaking. In early proposals you generally use standard assumptions, and in detailed studies you refine them according to site conditions. Therefore, when reading this screen, be conscious of whether the entered values are standard or adjusted for the specific project. Overlooking this can lead to comparing multiple options that in fact don’t have aligned loss assumptions.

As you learn to interpret losses, you can judge variations in generation more calmly. If results seem too high, you can check which loss is likely underestimated instead of relying on a vague sense of unease. Conversely, if results are lower than expected, you can trace which loss items are having a large impact. Making PVSyst work in practice means not fearing losses but being able to decompose and explain them.

Point 7 The screen to interpret results and turn them into decisions

The result screen is what most people ultimately focus on, but it is not merely the place to view annual generation. Rather, it’s where you verify how the assumptions accumulated on the previous screens have manifested in the results. While reading generation, specific yield, loss breakdowns, and monthly trends, check whether the set conditions were appropriate and where there is room for improvement. Whether you know how to read PVSyst is most evident in how you interpret this result screen.

What you should avoid when viewing this screen is judging by a single annual figure. Even if the annual total looks good, monthly breakdowns may reveal severe dips in particular seasons or imbalances in losses. In comparisons, it’s important not only to look at differences in total generation but also to trace which factors caused those differences. Otherwise, when you see similar outcomes side by side, it becomes hard to decide which option to adopt.

The result screen also serves as the basis for materials used in internal sharing and decision-making. So read the numbers with the aim of being able to explain the results in words. For example, organizing explanations such as “this option benefits from the tilt condition but has somewhat larger shading losses” or “this option’s configuration is stable and losses are well balanced” will make PVSyst a decision-support tool rather than just calculation software.

More importantly, when results don’t meet expectations, you should be able to decide which screen to return to for revision. Knowing whether to revisit site assumptions, adjust tilt conditions, or refine shading and losses improves the quality of recalculations. People who have internalized how to read PVSyst’s main screens use the result screen not as an endpoint but as a starting point to improve the study. Adopting this perspective greatly increases PVSyst’s usefulness in practice.

Understanding how to read the screens makes PVSyst more practical for real work

What really matters when using PVSyst is not memorizing every function in detail. It’s understanding which screen has which role and how each setting links to later results. Grasp the overall framework on the initial project screen, set the foundation with meteorological conditions, determine the directionality of incoming irradiation with tilt settings, create the physical reality with system configuration, bring the plan closer to reality with shading and losses, and finally use the result screen to make decisions. Once you can read in this flow, PVSyst becomes far easier to navigate.

For practitioners, being able to explain the meaning of settings is more important than operating speed. If you can put into your own words why you chose certain assumptions and why you got the results you did, the quality of your studies stabilizes. Conversely, if you open the screens in order without assigning meaning, you may be able to compute but not to judge. Understanding how to read PVSyst means having a line of reasoning for the study based on the role of each screen rather than knowing the operation steps.

To support the accuracy of such simulations in the field, you also need not only desk-based settings but reliable position and terrain information obtained on site. In particular, confirming the installation position, understanding surrounding conditions, and organizing potential shading require accurate field data. When you want to carry out positioning and reference checks more reliably on site, using a high-precision GNSS positioning device that can be attached to an iPhone, such as LRTK, is an effective option. By linking PVSyst studies with on-site verification, you can further improve the accuracy of your plans.