photovoltaics – Voltmax Energy Solutions in Luxembourg

Overpaneling and inverter sizing – how much DC oversizing is smart?

Voltmax — Wed, 10 Dec 2025 11:39:25 +0000

When planning a PV installation and trying to match the power of your solar panels to the inverter, you quickly discover that inverter sizing and PV system design have a major impact on long-term solar energy production. One of the most important concepts in modern solar engineering is over-paneling, also known as DC oversizing. In today’s PV systems, the DC/AC ratio directly influences performance, return on investment and how effectively the solar system works in real-world conditions.

This guide explains when over-paneling is worth applying, how an oversized PV array can increase annual energy yield, what solar designers should consider when choosing the DC/AC ratio, and which limitations signal that adding more panels no longer provides meaningful benefits.

What is overpaneling in a solar PV system?

DC-to-AC ratio explained in simple terms

Overpaneling refers to installing a photovoltaic array with a higher DC power capacity than the nominal AC power output of the inverter. In other words, the solar panels are intentionally oversized in comparison to the inverter’s rating. The key parameter here is the DC-to-AC ratio, which tells us how much total panel power (DC) is connected to how much inverter power (AC). For example, if a 7 kW DC array is connected to a 5 kW AC inverter, the DC-to-AC ratio is 1.4. Increasing this ratio allows the system to produce more usable power during most daylight hours, especially in the morning, late afternoon, or during cloudy conditions. As a result, the inverter spends more time operating close to its peak efficiency rather than underloaded.

What is inverter clipping and why it happens

Because the solar panels can generate more DC power than the inverter is able to convert to AC at any given moment, there are short periods—typically around midday on very sunny days—when the inverter reaches its maximum output and cannot convert the surplus energy. This limitation is known as inverter clipping. The excess power is simply not used, so the system’s production curve gets “flattened” at the top. While clipping may sound like a drawback, the additional energy produced during the rest of the day usually outweighs the small amount of energy lost during peak production hours. This is why overpaneling is considered both economically and technically beneficial in many installations, especially in regions with variable climate or limited roof space.

Why overpaneling works in real-world PV performance

In theory, solar panels should deliver their full nameplate power output — but this happens only under Standard Test Conditions (STC), which almost never occur on an actual rooftop. Real-world weather, temperature, dirt, shading, and seasonal angles reduce the effective production of every PV array. Overpaneling compensates for these natural performance losses by connecting more DC power (solar panels) to the inverter than the inverter’s maximum AC rating. As a result, instead of working underloaded most of the time, the inverter delivers high output more consistently throughout the day and throughout the year.

Panels rarely reach their STC nameplate power

The wattage printed on a solar panel label represents output under perfect laboratory conditions: 1,000 W/m² irradiance, 25°C cell temperature, and an ideal light spectrum. On a real roof, these numbers are almost never achieved. High cell temperatures in summer can reduce panel efficiency by 10–20%. Dust, clouds, morning and evening sun angles, and winter conditions bring the output even lower. This means a “10 kW” PV array often spends only a tiny portion of the year operating anywhere near 10 kW. By oversizing the DC side, homeowners make better use of the inverter’s capacity throughout the day instead of leaving energy production unused.

Lower cost per kWh by adding more solar panels

From a financial point of view, overpaneling increases the return on investment. In many markets, solar panel prices have dropped significantly, while inverters remain a relatively expensive component. Instead of buying a substantially larger inverter, it is usually cheaper to add a few more panels to boost annual energy production. Even if a small amount of energy is occasionally clipped at noon on very sunny days, the extra energy harvested in the mornings, afternoons, and in cloudy weather far outweighs those losses. The result is more solar electricity for the same or nearly the same total system cost — and therefore a lower cost per kilowatt-hour over the lifetime of the installation.

Why overpaneling boosts real-world performance

Solar panels reach their nameplate power only under rare laboratory conditions
Overpaneling helps to compensate for temperature, weather, and seasonal losses
The inverter runs closer to its optimal efficiency for a larger portion of the day
Occasional inverter clipping is minimal compared to gains in yearly energy output
Adding extra panels is usually cheaper than upgrading to a larger inverter
More annual production = lower cost per kWh and faster ROI

When does over-paneling stop being beneficial?

Over-paneling remains effective only within a certain range. Industry-standard inverter sizing usually recommends a DC/AC ratio between 1.2 and 1.5. Beyond this level, the benefits flatten out while the disadvantages grow.

One of the first symptoms of excessive DC oversizing is prolonged inverter clipping. Short, midday clipping peaks are normal and have minimal impact on yearly output, but clipping that lasts for hours each day reduces annual production and can undermine the purpose of over-paneling.

Voltage limits also play a critical role. In cold conditions, open-circuit voltage increases, and overly long strings can exceed the inverter’s maximum input voltage. This poses a technical risk and requires the array to be redesigned. Excessive oversizing may also lead to higher thermal stress on the inverter, reducing reliability and lifespan by forcing it to operate near its limits too frequently.

Economic factors matter as well. When using high-end solar panels, adding more modules can become disproportionately expensive compared to selecting a slightly larger inverter. For these reasons over-paneling is best applied within an optimal range where PV system efficiency rises without surpassing electrical or economic limits.

Recommended DC-to-AC ratios for modern PV design

Selecting the right DC-to-AC ratio is one of the most important decisions when sizing a solar PV system. A well-designed system aims to maximize yearly electricity production while keeping hardware costs under control and avoiding excessive clipping. In modern PV engineering, slight oversizing of the DC side is not a flaw — it is now considered a best practice, especially given today’s panel efficiency, temperature behavior, and rapidly falling module prices. The key is not to avoid clipping completely, but to choose a ratio where the inverter runs close to its peak efficiency much of the year while clipping remains minimal and financially insignificant.

Typical design ranges for residential and small commercial

Most PV designers today no longer aim for a 1:1 DC-to-AC match. For residential systems, optimal ratios frequently fall between 1.2 and 1.4 — and even 1.5 can be justified in climates with frequent cloud cover, high temperatures, or east–west roof layouts. For small commercial installations, ratios of 1.3 to 1.6 are common due to higher daytime energy demand and larger roof areas. These ranges allow the inverter to operate closer to its peak power rating more consistently, improving energy yield without requiring a larger, more expensive inverter.

Annual energy gain vs clipping losses

When the DC array is oversized, two things happen:

Annual energy production increases because low and medium irradiation periods are used more effectively.
Short periods of inverter clipping occur around solar noon on very bright days.

However, long-term data shows that the energy gained throughout the year is significantly greater than the energy lost to clipping. Even at a 1.4 ratio, clipping losses might total only 1–3% annually, while total generation may increase by 8–15%. For most homeowners and businesses, the additional production during mornings, afternoons, and cloudy days is what drives the return on investment.

Is inverter clipping really a problem?

In practical terms — not usually. Clipping looks dramatic when viewed on a production graph, because the curve appears “flat-topped” at peak midday hours. But the duration of clipping is short, and the total kilowatt-hours lost are small. Avoiding clipping entirely would require purchasing a larger inverter, leading to higher system costs for very little additional production. Modern PV design philosophy accepts a small amount of clipping as a strategic trade-off for a larger yearly energy yield and lower cost per kWh. The real “problem” is not that clipping exists — it’s when a system is undersized on the DC side, causing the inverter to run below its optimal output for most of the day.

How to decide if overpaneling makes sense for your roof

Overpaneling is not just a technical trend — it is a strategic design choice that can significantly increase your annual solar production when applied in the right conditions. The key is to evaluate your roof, inverter size, space availability and energy goals as one system. You don’t need to eliminate clipping completely — the smartest PV systems accept a small amount of clipping in exchange for much higher total kWh across the year. If your aim is to maximise clean energy from every square metre of roof, overpaneling is often the most cost-effective solution.

Checklist for homeowners and PV designers

Use this list as a quick decision tool — if most points match your situation, overpaneling probably makes sense:

You want to maximise total annual kWh production, not just peak midday output
You have unused roof space where you could add more panels without major extra cost
Your region has variable weather, frequent clouds, high summer temperatures or winter seasons
You have east–west roof orientations or several roof planes rather than a single perfect south pitch
You want to reduce payback time and lower the cost per produced kWh over 25 years
Adding more panels is cheaper than buying a significantly larger inverter
A small amount of inverter clipping is acceptable in exchange for more energy throughout the year
The inverter manufacturer supports oversizing and the design stays within warranty limits
Local grid connection rules allow oversizing of the PV array relative to the inverter

Questions to ask your installer about overpaneling

To ensure a safe and financially optimal design, it’s useful to speak openly with your installer. Recommended questions include:

What DC-to-AC ratio do you recommend for my roof and why?
How much clipping do you expect annually and how will it affect total energy production?
Will oversizing the panels stay within the manufacturer warranty and technical limits of the inverter?
Is a bigger inverter necessary, or is adding more panels a better investment in my case?
How will roof temperature, shading and orientation affect an oversized array?
Can you show projected yearly production for a 1.0 vs 1.3–1.4 DC/AC setup?

A professional installer like Voltmax provides side-by-side annual yield simulations for different DC/AC ratios, helping homeowners choose the most profitable configuration rather than the biggest inverter. This removes uncertainty and makes the decision purely data-driven.

FAQ — overpaneling, inverter sizing and clipping

Overpaneling refers to connecting a solar panel array (DC power) that is larger than the AC rating of the inverter. The goal is to increase total yearly electricity production — not just maximize output during the brightest hours of the day. A slightly oversized DC array allows the inverter to operate closer to its maximum power for more hours across the day and across the year, especially during mornings, afternoons and cloudy weather. A small amount of inverter clipping becomes acceptable because the net energy gain far outweighs the small losses at midday.

Is it safe to oversize solar panels compared to the inverter?

Yes. Overpaneling is safe when it follows the inverter manufacturer’s specifications. Modern inverters are designed to limit their output safely once they reach their maximum AC power rating — they do not “overheat” or become overloaded. Oversizing does not push additional AC power into the grid; the inverter simply caps the output and discards the unused surplus.

How much can I overpanel my inverter — what DC/AC ratio is best?

For most residential and small commercial systems, a DC/AC ratio between 1.2 and 1.4 provides the best balance of annual production and equipment cost. Ratios up to 1.5 are often viable in climates with high temperatures, frequent cloud cover or mixed roof orientations. The goal is not to eliminate clipping, but to increase total kWh throughout the year and reduce the cost per produced kWh.

Does overpaneling damage the inverter or affect its warranty?

No — as long as oversizing stays within the limits specified by the inverter manufacturer. Overpaneling does not force the inverter to output more power than it is designed for; it simply gives the inverter more available DC power to convert. In practice, warranty conditions often include a maximum allowable DC/AC ratio, and staying under that threshold keeps the warranty fully valid.

What is inverter clipping and should I worry about it?

Inverter clipping occurs when the DC power from the solar panels briefly exceeds what the inverter can convert to AC — usually around midday on very sunny days. The inverter simply caps the output at its maximum and discards the excess. Clipping may look dramatic on a production graph, but the total lost energy is typically very small, while the extra production gained during the rest of the day is much greater. In modern PV design, slight clipping is considered normal and economically beneficial.

OPEN DAY 2025

Voltmax — Wed, 12 Mar 2025 14:01:30 +0000

Luxembourg opens the 2025 photovoltaic season! Come to the Open Day with Voltmax, SolarCells and Andy Schleck

Take advantage of the unique opportunity of the Open Day and spend a nice Saturday.

📅 Saturday, 29 March 2025 | 12:00 – 17:00
📍 Andy Schleck Cycles,
📍 2, rue des Prés, L-5972 Itzig

Luxembourg is entering a new renewable energy season! On March 29, residents will have a unique opportunity to learn how to use solar energy and take advantage of available subsidies for photovoltaic installations and home renovations.

Voltmax, an expert in photovoltaic installations, together with the Luxembourg solar panel manufacturer SolarCells and Andy Schleck, winner of the Tour de France and entrepreneur, invite all interested parties to the Open Day inaugurating the 2025 photovoltaic season.

This is a great opportunity to learn how to reduce your electricity and heating bills, modernize your home and increase its energy efficiency.

🔆 What attractions await participants?

🔹 Free consultations with Voltmax experts on:

✅ Photovoltaics and possibilities of subsidizing the installation,
✅ Choosing the right PV system for your home,
✅ Learn about the specifications and benefits of Luxembourg Solar Cells panels
✅ Energy storage and hybrid solutions.

🔹 Thermal modernization advice – learn how to:

🏡 Reduce heat loss and improve building insulation,
🔧 Replace the roof, windows and doors with more energy-efficient ones,
💡 Reduce heating costs and optimize energy consumption.

In addition:

🔹 Meet Andy Schleck – cycling legend and owner of bikes shops.
🔹 Refreshments and a glass of champagne – because talks about the future of energy should take place in a pleasant atmosphere!
🔹 Competitions with attractive prizes! 🎁

🌿 Time for a green change in Luxembourg!

Thanks to the support of the government of the Grand Duchy of Luxembourg, residents can take advantage of numerous subsidies and reliefs for photovoltaic installations and modernization of their homes. The Open Day is the perfect time to find out what steps are worth taking to get more from solar energy and make your home more energy-efficient.

💡 FREE ADMISSION – come and benefit from the knowledge of experts!

Come, find out how you can use the potential of the sun and start the new season with energy! 🔆♻️

Missed our Open Day with Andy Schleck? No worries — you can still take the lead in renewable energy by choosing your own installation today and start reaping the benefits

Shining a Light on Solar: Unleashing the Power of Photovoltaic Systems

Voltmax — Fri, 07 Mar 2025 09:12:57 +0000

As the sun rises each day, so does the potential for harnessing its radiant energy through solar power. In our article, “Shining a Light on Solar: Unleashing the Power of Photovoltaic Systems,” we delve into the transformative impact of photovoltaic systems. These innovative systems not only promise a sustainable future but also offer a practical solution to soaring energy demands.

Imagine a world where rooftops glisten with solar panels, silently converting sunlight into electricity, reducing carbon footprints, and slashing energy bills. With advancements in solar technology, this vision is becoming increasingly attainable. From residential homes to large-scale enterprises, the benefits of embracing solar power are undeniable.

Join us on a journey to illuminate the potential of solar energy and discover how photovoltaic systems are revolutionizing the way we power our world. Let’s shine a light on solar together and unleash the full power of the sun!

The Basics of Solar Energy

Solar energy originates from the sun, a colossal ball of plasma that emits an astonishing amount of energy in the form of light and heat. This energy travels through space and reaches Earth, where it can be captured and transformed into usable power. The sun releases energy at a rate of approximately 173,000 terawatts, which is more than 10,000 times the world’s total energy use. This immense potential makes solar power one of the most abundant and sustainable energy sources available to humanity.

Harnessing solar energy involves converting sunlight into electricity or heat. This can be achieved through various technologies, but the most prominent method is using photovoltaic (PV) systems. These systems directly convert sunlight into electricity using semiconductor materials. Another method is solar thermal energy, which captures heat from the sun to produce steam that can drive turbines for electricity generation. Both methods play a crucial role in diversifying our energy portfolio and reducing reliance on fossil fuels.

Understanding the fundamentals of solar energy is vital for grasping its potential impact on our world. Solar power is clean, renewable, and inexhaustible, which means that as long as the sun exists, we can continuously rely on its energy. This characteristic makes solar energy an attractive option for addressing the global energy crisis, combating climate change, and promoting sustainable development.

Advantages of Solar Power

The benefits of solar power are numerous and far-reaching, making it an increasingly popular choice for individuals, businesses, and governments alike. One of the primary advantages is the reduction in electricity bills. By generating their own electricity through solar panels, users can significantly lower their monthly energy expenses. In many cases, excess energy produced can be sold back to the grid, creating additional financial incentives for solar adoption.

In addition to cost savings, solar power contributes to a cleaner environment. Traditional energy sources, such as coal and natural gas, emit greenhouse gases and pollutants that contribute to climate change and health issues. Solar energy, on the other hand, produces no emissions during operation, helping to reduce carbon footprints and improve air quality. By transitioning to solar power, individuals and communities can take meaningful steps toward protecting the planet for future generations.

Another significant advantage of solar energy is its potential for job creation. The solar industry has seen rapid growth over the past decade, leading to the establishment of numerous jobs in manufacturing, installation, maintenance, and research. As more people invest in solar technology, the demand for skilled workers in these areas continues to rise, providing economic opportunities and stimulating local economies.

Understanding Photovoltaic Systems

Photovoltaic systems are designed to convert sunlight into electricity using the photovoltaic effect, a process that occurs in certain materials when exposed to light. When sunlight strikes the surface of a photovoltaic cell, it excites electrons and creates an electric current. These cells are typically made from silicon, which is a semiconductor material known for its effective energy conversion properties.

A complete photovoltaic system consists of multiple components, including solar panels, an inverter, mounting equipment, and sometimes battery storage. Solar panels are composed of many individual photovoltaic cells that work collectively to generate electricity. The inverter plays a critical role by converting the direct current (DC) produced by the solar panels into alternating current (AC), which is the type of electricity used in homes and businesses. Mounting equipment secures the panels in place, ensuring they are optimally positioned to capture sunlight.

Understanding how photovoltaic systems function is essential for evaluating their efficiency and performance. Factors such as the orientation and angle of the panels, shading from nearby structures or trees, and the efficiency of the inverter can all impact the amount of electricity generated. By optimizing these elements, users can maximize their energy output and enjoy the full benefits of solar power.

How Do Solar Panels Work?

Solar panels operate on the principle of converting sunlight into electricity through the photovoltaic effect, as previously mentioned. When sunlight hits a solar panel, it excites electrons within the semiconductor material, causing them to flow and generate an electric current. This process is initiated when photons from sunlight interact with the silicon atoms in the solar cells.

Each solar cell contains a positive and a negative layer of silicon, creating an electric field. When sunlight is absorbed, it energizes the electrons, allowing them to break free from their atoms and move across the electric field, producing a direct current (DC). This current is then collected by conductive metal plates on the sides of the solar cells and routed to the inverter for conversion into alternating current (AC).

The efficiency of solar panels varies based on several factors, including the quality of the materials used, the design of the solar cells, and environmental conditions such as temperature and sunlight intensity. Modern solar panels can achieve efficiencies upwards of 20%, meaning that they convert a significant portion of sunlight into usable electricity. As advancements in technology continue, these efficiencies are expected to improve further, making solar energy an even more compelling choice for energy generation.

Types of Solar Panels

When it comes to solar panels, there are primarily three types available in the market: monocrystalline, polycrystalline, and thin-film panels. Monocrystalline panels are known for their high efficiency and longevity. Made from a single crystal structure, they tend to have a sleek black appearance and can achieve efficiencies of 20% or more. Their compact design makes them ideal for installations with limited space, as they generate more electricity per square foot compared to other types.

Polycrystalline panels, on the other hand, are composed of multiple silicon crystals. They are typically blue in color and are less expensive to manufacture than monocrystalline panels. While their efficiency is slightly lower, usually around 15-17%, they are still a popular choice for residential installations due to their affordability and solid performance. For many homeowners, polycrystalline panels strike a balance between cost and energy output.

Thin-film solar panels represent a different approach, utilizing layers of photovoltaic material that can be deposited on various surfaces. These panels are lightweight and flexible, making them suitable for a range of applications, including building-integrated photovoltaics (BIPV) and large-scale solar farms. However, they tend to have lower efficiencies, around 10-12%, requiring more space to generate the same amount of electricity as crystalline panels. Each type of solar panel has its own set of advantages and considerations, allowing users to choose the best fit for their specific needs.

Factors to Consider Before Installing Solar Panels

Before making the decision to install solar panels, several factors should be carefully evaluated to ensure a successful and beneficial investment. First and foremost, it is essential to assess the site’s solar potential. This involves analyzing the amount of sunlight your location receives throughout the year, as well as any potential obstructions such as trees or nearby buildings that could cast shadows on the panels. Conducting a solar assessment can help determine the ideal placement and sizing of your solar system.

Financial considerations are also crucial when contemplating solar panel installation. While the upfront costs can be significant, potential savings on electricity bills, available incentives, and financing options should be taken into account. Researching local solar incentives, such as tax credits, rebates, or net metering policies, can help reduce the overall cost of installation and enhance the return on investment. Additionally, evaluating various financing options, such as solar loans or leases, can make solar more accessible for homeowners.

Lastly, understanding the long-term maintenance and performance of solar panels is vital. Solar systems are generally low-maintenance, but periodic cleaning and inspections are necessary to ensure optimal performance. In addition, consider the warranty and lifespan of the solar panels, as these factors can influence the overall value of the system. By carefully analyzing these considerations, you can make an informed decision that aligns with your energy goals and financial situation.

Solar Panel Installation Process

The installation of solar panels involves several steps, each crucial to ensuring a successful and efficient system. The first phase is the design and planning stage, where homeowners work with solar professionals to assess their energy needs and determine the best system size and configuration. This often involves conducting a site survey and reviewing the home’s electrical system to ensure compatibility with the new solar installation.

Once the design is finalized, the installation process begins. Solar panels are typically mounted on the roof or on ground-mounted structures, depending on the site conditions. The mounting brackets are installed first, followed by the solar panels. Electricians then connect the solar panels to the inverter, which converts the generated DC electricity into AC electricity for use in the home. This phase may also involve running electrical conduit and connecting the system to the local grid.

After installation, the final step is to perform system inspections and obtain the necessary permits. Local authorities may require inspections to ensure that the installation meets safety and building codes. Once approved, the solar system can be activated, allowing homeowners to begin generating their own clean energy. This entire process can vary in timeline depending on the size of the system, permitting requirements, and weather conditions but typically takes a few days to complete.

Maintenance Tips for Solar Panels

Maintaining solar panels is essential to ensure they operate at peak efficiency over their lifespan. One of the simplest yet most effective maintenance practices is regular cleaning. Dust, dirt, and debris can accumulate on the surface of solar panels, obstructing sunlight and reducing their energy production. Depending on the local environment, panels may need to be cleaned several times a year. In many cases, rainfall can help wash away dirt, but for areas with minimal precipitation, a gentle rinse with water or a soft sponge can be beneficial.

In addition to cleaning, periodic inspections of the solar system are recommended to identify any potential issues early on. Homeowners should visually inspect the panels for cracks, discoloration, or other signs of damage. It’s also important to check the inverter and electrical connections to ensure they are functioning correctly. Many solar systems come with monitoring systems that can alert users to performance issues, making it easier to address problems as they arise.

Finally, understanding the warranty and service agreements associated with solar panels can aid in maintenance planning. Most solar panels come with a warranty that covers defects and performance guarantees for a specific period, often 25 years. Keeping records of maintenance activities and any repairs performed can help homeowners ensure their solar investment is protected and performing optimally throughout its life.

Incentives and Subsidies for Solar Energy in Luxembourg

To support the development of renewable energy, the Luxembourg government offers a number of subsidy programs and tax breaks that reduce the costs of installing solar panels. One of the key support mechanisms is the PRIMe House program, which provides non-refundable subsidies to homeowners investing in solar installations. In addition, households can benefit from a reduced VAT rate (8%) on the purchase and installation of photovoltaic systems, further reducing the upfront cost.

In addition to subsidies, Luxembourg offers a favorable net metering system (known as a feed-in tariff mechanism), which allows owners of photovoltaic systems to sell surplus energy to the grid at set rates. This means that the energy produced during the day can be sent to the grid and settled with energy operators, increasing savings on electricity bills. Depending on the capacity of the installation and local regulations, the period of validity of feed-in tariffs can be up to 15 years.

It is also worth checking what additional support is offered by municipalities and banks – some financial institutions in Luxembourg provide preferential ecological loans for investments in renewable energy sources. Thanks to these mechanisms, investing in photovoltaics becomes even more profitable and affordable for homeowners and companies.

Conclusion: Embracing the Future with Solar Power

As we conclude our exploration of photovoltaic systems and their transformative potential, it’s clear that embracing solar power is not just a trend but a necessary step toward a sustainable future. The advantages of solar energy are vast, from reducing energy bills and minimizing environmental impact to creating jobs and promoting energy independence. By harnessing the sun’s abundant energy, we can pave the way for a cleaner, greener planet.

The technology behind solar panels continues to evolve, leading to higher efficiencies, reduced costs, and improved accessibility for homeowners and businesses alike. With various types of solar panels available, individuals can choose systems that best suit their needs and circumstances. As more people become aware of the benefits of solar energy, the momentum for its adoption will only grow stronger.

Incentives and rebates play a crucial role in making solar power a viable option for many, and understanding these programs can empower homeowners to invest in their energy future. By taking the leap into solar energy today, we not only contribute to our savings but also to the preservation of our planet for generations to come. Let’s embrace the future with solar power and shine a light on the path to sustainability.

Ready to harness the power of the sun for your home or business? Get in touch today and let’s design a photovoltaic system that works perfectly for you

Photovoltaics in Luxembourg – Is It Still a Profitable Investment in 2025?

Voltmax — Tue, 25 Feb 2025 08:48:33 +0000

In recent years, interest in photovoltaics in Luxembourg has increased significantly. More and more residents are choosing solar energy to lower their electricity bills. It offers independence from fluctuating energy prices and helps protect the environment. Government subsidies and the development of modern technologies are making photovoltaic systems more efficient and accessible than ever before.

However, many potential investors wonder whether photovoltaics are still a profitable solution in 2025. Do electricity prices and installation costs still allow for a quick return on investment? What changes in the law and available subsidies may affect the profitability of such an undertaking?

This article explores the current state of the photovoltaic market in Luxembourg. We’ll discuss key benefits and address common concerns. If you’re considering solar panels, you’ll find all the answers here.

How does photovoltaics work and why is it a great solution?

Photovoltaics is a technology that allows you to transform solar energy into electricity. Thanks to it, we can become independent from rising electricity prices, reduce bills and use an ecological source of energy. In Luxembourg, where more and more people are focusing on sustainable development, solar panels have become a popular solution for both homes and companies.

How does a photovoltaic installation work?

The system consists of several basic elements:

Photovoltaic panels – absorb sunlight and convert it into direct current.
Inverter – converts direct current into alternating current, which powers home appliances.
Bidirectional meter – monitors the amount of energy produced and drawn from the grid.
Optional energy storage – stores surplus energy for later use.

The system works simply—solar panels generate electricity during the day, which can be used instantly or fed into the power grid. If the installation is equipped with batteries, excess energy can be stored and used later, for example at night.

Benefits of photovoltaics

Reduced electricity bills – instead of paying for energy, you produce it yourself.
Less dependence on energy suppliers – changes in electricity prices no longer have such a big impact on the household budget.
Care for the environment – using renewable energy reduces carbon dioxide emissions.
Increased property value – houses with PV installations are more attractive to buyers.
Possibility to take advantage of subsidies – in Luxembourg, subsidies are available that reduce the cost of the investment.

Photovoltaics is a solution that allows for long-term savings and greater energy independence. It is an investment that not only pays off, but also contributes to environmental protection.

Will photovoltaics still be profitable in 2025?

Investing in photovoltaics in Luxembourg has been one of the best ways to reduce your electricity bills and become energy independent for years. However, many people wonder whether installing solar panels is still as profitable as it was before in 2025. Electricity prices, available subsidies and technological developments have a key impact on how quickly the investment pays off.

1. Electricity prices and the profitability of photovoltaics

Energy costs in Luxembourg are rising year by year. Although prices may fluctuate, the upward trend is clear, which makes producing your own electricity increasingly attractive. Photovoltaics can help you become independent from energy suppliers and limit the effects of electricity price increases.

2. Subsidies and tax breaks for photovoltaics in Luxembourg

The Luxembourg government supports investments in renewable energy sources through various subsidy programs. Depending on the type of installation and its size, you can get a refund of part of the costs. In addition, people using photovoltaics can count on favorable conditions for settling surplus energy with the grid, which further increases savings.

3. Luxembourg Photovoltaic Subsidies in 2025

In 2025, Luxembourg will continue to support investments in renewable energy sources, including photovoltaic installations, through a variety of subsidy programmes and feed-in tariffs. Below, we present the available forms of support and the factors that influence their level.

Feed-in Tariffs

Luxembourg has implemented feed-in tariffs for small photovoltaic systems. These tariffs guarantee a fixed price for electricity generated by the installation and supplied to the grid for a specified period. This programme covers installations up to 200 kW, divided into three categories:

Up to 30 kW: The smallest installations, often used in single-family homes.
From 30 kW to 100 kW: Medium-sized systems, suitable for larger residential buildings or small businesses.
From 100 kW to 200 kW: The largest installations covered by the programme, intended for large commercial or industrial facilities. Feed-in tariffs are valid for 15 years from the date of installation. The rates depend on the capacity of the system and current government regulations. The aim of this program is to provide financial stability to investors and encourage the development of small and medium-sized photovoltaic installations.

Subsidy programs

In addition to the feed-in tariffs, the Luxembourg government offers direct subsidies for photovoltaic installations. The amount of support depends on several factors:

Type of beneficiary: Individuals, companies or farmers can qualify for different levels of support.
Power of installation: Larger systems can receive higher subsidies, but the percentage of support may decrease with increasing capacity.
Location: Some regions may offer additional incentives to promote renewable energy sources.
Technology and efficiency: Modern and more efficient technologies may qualify for higher subsidies.

For the latest details on available programs and subsidy amounts, consult local authorities or visit official government websites on renewable energy.

Tax breaks and other incentives

Luxembourg also offers tax breaks for investors in renewable energy sources. These can include income tax deductions for costs related to the purchase and installation of a photovoltaic system. Additionally, some programs allow for favorable loans or leasing on preferential terms.

It is also worth mentioning special support programs for low-income households. In 2025, Luxembourg plans to triple the energy allowance for the most vulnerable families to combat energy poverty. Eligibility for this support depends on the household’s income.

How to apply for subsidies?

The application process for photovoltaic subsidies in Luxembourg usually includes the following steps:

Project assessment: Determine the capacity and costs of the planned installation.
Check available programs: Familiarize yourself with current support offers and their conditions.
Prepare documentation: Collect the necessary documents, such as technical designs, cost estimates, or proof of ownership.
Application submission: Submitting a complete application to the appropriate institution before starting installation work.
Project implementation: After receiving approval, carry out the installation in accordance with the approved project.
Settlement of subsidy: Submitting evidence of project implementation and incurred costs in order to receive financial support.

Due to the dynamic changes in regulations and availability of funds, it is recommended to regularly monitor official government announcements and consult with local experts in the field of renewable energy.

Investing in photovoltaics in Luxembourg in 2025 remains a profitable venture, supported by numerous government programs and financial incentives. Thanks to them, it is possible to significantly reduce installation costs and return on investment faster.

4. Payback period

The average payback period for a photovoltaic installation in Luxembourg is around 6-10 years, depending on several factors:

Total installation cost,
Level of own electricity consumption,
Subsidies obtained,
Electricity price.

The more energy you use for your own needs, the faster the return on investment, because you avoid the high costs of purchasing electricity from the grid.

Is 2025 a good time to invest?

Considering the increase in energy prices, the availability of subsidies and the development of photovoltaic technology, investing in solar panels remains a very profitable solution. Modern systems allow for greater efficiency, and energy storage allows for even better use of the electricity produced.

Photovoltaics is not only a saving, but also a way to independence and financial stability in the face of rising energy costs.

Common fears and myths about photovoltaics

Despite the growing popularity of solar energy, there are still many myths and misunderstandings surrounding photovoltaics. Many people fear that the panels will not work in winter, that the installation is complicated, or that the assembly may damage the roof. In reality, most of these fears are unfounded, and modern photovoltaic systems are efficient, safe, and adapted to various conditions.

One of the most common myths is the belief that photovoltaics do not work in winter or on cloudy days. In reality, panels produce energy even when the sun is not shining brightly. In winter, energy production is lower than in summer, but low temperatures can enhance cell efficiency, partially offsetting shorter days. A well-designed system also allows for storing excess energy or drawing additional power from the grid under favorable conditions.

Another concern is the complicated installation and possible damage to the roof. In reality, a photovoltaic installation is safe and installed by certified specialists who choose the right mounting system for the roofing type. Panels are secured without damaging the roof structure, and high-quality components prevent leaks or mechanical damage.

Some people also fear that the investment in photovoltaics in Luxembourg will not pay off in a reasonable time. The payback period depends on factors like energy consumption, subsidies, and electricity prices. In Luxembourg, it currently averages 6–10 years. After that, the system generates real savings, with a lifespan often exceeding 25 years, ensuring long-term financial benefits.

Low Maintenance, High Returns: The Truth About Solar Panel Care

There is also no shortage of concerns about the need for frequent maintenance. Modern photovoltaic systems are practically maintenance-free. The panels are resistant to weather conditions, and their surface often has self-cleaning coatings that reduce the deposition of dirt. Periodic inspections and possible washing of the panels once every few years are enough for the system to operate effectively for many years.

Debunking these myths shows that photovoltaics is a reliable and effective solution. It not only reduces electricity bills but also increases property value and supports environmental protection. With advancing technology and available support programs, investing in solar energy is now more accessible and profitable than ever.

Photovoltaics with Voltmax – why is it worth trusting us?

The decision to invest in photovoltaics in Luxembourg is a step towards savings and energy independence. However, choosing the right contractor who will provide professional installation, high quality components and comprehensive service at every stage of the project is crucial. Voltmax is a company that specializes in photovoltaic installations in Luxembourg, offering its clients modern, efficient and tailored solutions.

With years of experience and hundreds of completed projects, Voltmax offers a full-service approach—from consultation and design to installation, service, and maintenance. Each system is tailored to individual technical conditions and user needs, ensuring maximum solar energy efficiency.

The quality of components is one of the most important aspects of every PV installation. Voltmax partners only with trusted suppliers of panels, inverters, and mounting systems, ensuring long-term reliability and high efficiency. Additionally, the company offers optional energy storage and integration with power management systems, optimizing costs and maximizing self-consumption of generated energy.

Comprehensive Service: From Installation to Maintenance and Subsidies

Professional installation and attention to detail are another reason to trust Voltmax. Each installation is carried out by experienced specialists who ensure safe and aesthetic installation, without the risk of damaging the roof or other structural elements of the building.

After-sales service and maintenance are another advantage. Voltmax not only installs installations, but also offers technical support, system operation monitoring and regular inspections that help maintain the installation in excellent condition for many years.

By partnering with Voltmax, customers receive support in obtaining available subsidies and tax reliefs for photovoltaics in Luxembourg. The company assists with preparing the necessary documentation and applications, helping to minimize investment costs and shorten the payback period.

Choosing photovoltaics with Voltmax means not only lower electricity bills but also the assurance of a reliable and efficient system for years to come. It’s an investment that positively impacts both your budget and the environment, making it essential to choose a trusted partner in the industry.

Final conclusions – is this a good time to invest in photovoltaic in Luxembourg?

Photovoltaics is currently one of the most cost-effective and future-proof solutions for households and businesses in Luxembourg. As energy prices continue to rise, increasing government support and rapid technological advancements make investing in solar panels a smart financial and ecological decision.

Moreover, modern photovoltaic installations are not only efficient and safe but also designed to withstand various weather conditions. With the addition of energy storage and intelligent power management systems, you can further enhance your savings and energy independence. Furthermore, available subsidies and tax breaks significantly lower initial costs, making the payback period even shorter—often just a few years.

Despite common misconceptions, photovoltaics work efficiently all year round, and installation does not pose a risk to the roof structure. In fact, modern systems require minimal maintenance and can operate reliably for 25–30 years without issues.

By choosing Voltmax, you benefit from professional advice, high-quality components, and expert installation tailored to your specific needs. Additionally, the company provides comprehensive support, including assistance in securing subsidies, ensuring a smooth and cost-effective process from start to finish.

If you’re considering investing in photovoltaics in Luxembourg, contact Voltmax for a free consultation. Discover how you can lower your electricity bills and contribute to a greener future by harnessing the power of solar energy in your home or business.

Thinking about going solar in Luxembourg? Let’s talk about how much you could save in 2025 – our experts are ready to guide you every step of the way.

We invite you to our stand at the HOME EXPO

Voltmax — Wed, 02 Oct 2024 11:54:51 +0000

We are with our stand at the HOME EXPO fair, we invite you, your friends and family to participate in the fair and visit us in the Hall.

Our Stand 8D74

Join us at the largest construction and interior design fair – Home Expo 2024! Visit the Voltmax stand, where our experts will show you the latest solutions in photovoltaics, energy storage and electric car chargers.

10 to 13 October 2024 @ LUXEXPO THE BOX

Thursday: 10:00 am – 7:00 pm
Friday: 10:00 am – 9:00 pm
Saturday 10:00 am – 7:00 pm
Sunday: 10:00 am – 7:00 pm

✅ Learn how to reduce your electricity bills
✅ Discover the benefits of your own PV installation
✅ Take advantage of our specialists’ advice

Our advisors offer:

Energy consulting
Photovoltaic installation consulting
Heat pump heating installation advice
Consulting on government and municipal subsidies
Electrical Services Consultation

Don’t miss this opportunity – come and see how you can take care of savings and ecology in your home. See you at Home Expo 2024!

Fair website: https://home-expo.lu/

Your free admission: (download free ticket with QR code)

Admission tickets 2024

Home Expo 2024 is the largest construction, renovation and interior design trade fair in Luxembourg. The event will bring together hundreds of exhibitors from the construction, energy and design industries, offering the latest technologies and innovative solutions for homes and apartments.

During the fair, visitors will have the opportunity to:
✅ Learn about modern technologies in the field of construction and energy
✅ Consult with experts in photovoltaics, heating and energy saving
✅ Discover trends in interior design and smart home systems
✅ Take advantage of special offers and discounts available only during the event

The fair is also a great opportunity to talk to industry leaders and gain valuable tips on construction, modernization and energy-saving solutions.

Don’t miss this unique event!

Missed us at last year’s Home Expo? Book a private consultation today and enjoy the same experience — tailored exclusively for you, with the attention of a true luxury client

Do photovoltaic panels produce a magnetic field?

Voltmax — Thu, 18 Apr 2024 10:20:13 +0000

Solar panels are a frequently debated topic, especially when it comes to their potential health effects and environmental impact. One of the skeptics’ arguments is that photovoltaic panels generate a magnetic field that may harm human health. Is there truth to these fears?

Do photovoltaic panels produce a magnetic field?

Yes, solar panels do produce some magnetic field. As do many other electrical devices such as cell phones, TVs and Bluetooth devices. However, according to research conducted by scientists from the University of North Carolina, the level of this field is comparable to those encountered in everyday life and does not pose a health risk. What photovoltaic panels generate is the so-called non-ionizing radiation. That does not have the ability to damage DNA or cause genetic mutations.

It’s worth noting that tradditional materials like roofing and insulation significantly diminish any field experienced at the height of a room, whether it’s in a house or a farm building, almost to zero. Additionally, insulating materials such as polyurethane foam, mineral wool, or polystyrene are also highly effective in absorbing electromagnetic fields.

Who confirms no negative impact of photovoltaic panels?

Furthermore, the World Health Organization confirms that photovoltaic installations do not negatively impact human health. Additionally, photovoltaic panels aid in enhancing health by lowering emissions of harmful substances into the atmosphere. Moreover, the generation of electricity from photovoltaic panels is a clean process that reduces emissions of carbon dioxide, sulfur, and other pollutants. Consequently, this translates into an overall improvement in societal well-being.

Of course, there are many benefits to using solar energy, both for health and the environment. Research conducted by renowned scientific institutions confirms that solar energy obtained from photovoltaic panels contributes to a significant reduction in emissions of harmful substances such as nitric oxide and sulfur. This substances which are the main components of smog.

It is also worth noting that most photovoltaic panels are resistant to interference related to the magnetic field. The process of converting sunlight into electricity using the photovoltaic phenomenon is not significantly disturbed by this field.

In conclusion, concerns regarding the health and environmental impacts of solar panels are frequently unfounded. However, scientific research unequivocally confirms that the benefits of utilizing solar energy surpass any negative effects. Therefore, photovoltaic panels continue to stand as a pivotal element in the battle against climate change and the global shift towards sustainable energy sources.

Take advantage of a free audit! Receive a free quote for your photovoltaic installation.

Curious about the science behind solar panels? Get in touch with our experts and discover clear, reliable answers — plus the best solutions for your own installation

Recover and reuse: Recycling of photovoltaic panels

Voltmax — Fri, 22 Mar 2024 11:19:48 +0000

Recycling photovoltaic panels is an increasingly common phenomenon.

Recycling of photovoltaic panels in Europe and Luxembourg is gaining increasing importance in the context of the growing demand for sustainable energy solutions. This process, which enables the recovery of valuable materials and reduces environmental impact, becomes not only an answer to ecological needs but also to legal requirements imposed by EU directives.

Across Europe, thanks to stricter regulations on electronic waste and greater ecological awareness, countries such as Germany, Italy, Japan, and China lead in the implementation of advanced recycling technologies. The European Union, through various directives, obligates manufacturers and importers of photovoltaic panels to organize and finance recycling systems, aimed at increasing the efficiency of resource recovery and reducing the negative environmental impact.

Is it possible to recycle photovoltaic panels? If so, which part can be recycled?

In general, all photovoltaic panels are recyclable. Indeed, there are risk-free procedures for silicon-based panels as well as for thin-film panels containing cadmium. Moreover, recycling is regulated by the European Directive 2012/19/EU on waste electrical and electronic equipment, which is transposed into national law by the law of 9 June 2022 on waste electrical and electronic equipment: this framework currently requires at least 80% of the mass of a photovoltaic panel to be prepared for reuse or recycled, and 85% of the mass to be recovered.

The recycling rate of photovoltaic modules is nevertheless close to 100%, considering that the modules are generally composed mainly of glass, aluminium and other metals. Net modules usually contain very limited amounts of synthetic materials, such as silicon or other minerals. However, it is technically possible to recycle these elements, even if the processes for extracting them are not yet cost-effective. Thus, these materials are currently mainly used for thermal recovery.

The photovoltaic panel recycling process, which includes collecting and sorting, dismantling, shredding, thermal treatments, chemical processes, and cleaning, allows for the recovery of key materials such as glass, metals (including silver and aluminum), silicon, and other substances. These actions not only contribute to environmental protection but also support the development of sustainable solar energy, offering a second life to recovered materials. Let’s trace the key stages of this process that enable the transformation of used photovoltaic panels into valuable resources.

Stages of the recycling process

The photovoltaic panel recycling process consists of several stages:

Collecting and sorting: Panels are collected and transported to recycling centers, where they are sorted based on their type and material composition. The initial segregation involves separating elements into major categories: panels, equipment, wiring, heat sources, etc.
Dismantling: The preliminary dismantling involves removing aluminum frames and connectors, which are relatively easy to recover and reuse.
Shredding: Next, the panels are shredded to reduce their size and facilitate the separation of different components.
Thermal treatments: In some methods, panels are subjected to high temperatures to separate glass from other materials.
Chemical processes: At this stage, various chemical methods are used to recover valuable materials, such as silver, lead, or silicon.
Cleaning: The final stage involves cleaning the recovered materials so they are ready for reuse in the production of new photovoltaic panels or other products. Recovered substances and materials

In the process of recycling photovoltaic panels, a range of valuable materials are recovered:

Glass: Makes up about 75% of the panel’s mass and is easily recovered for reuse. The possibility of recovering glass from photovoltaic panels is high, reaching about 90-95%. This glass can be reused in the production of new panels or other products.
Metals, such as silver used in wires, and aluminum from panel frames. The recovery of metals from photovoltaic panels is also efficient, with the recovery of silver reaching up to 95%, and aluminum – up to 100%. These metals can be reused in various industrial sectors.
Silicon: Can be recovered, although its purification for reuse in photovoltaic panels is more complicated. The recovery of silicon is more complex, but recycling technologies continue to develop, aiming to increase recovery efficiency. Currently, about 85% of silicon can be recovered, which after proper cleaning can be reused in the production of new photovoltaic panels.
Other materials, including copper, lead, and plastics, are also recovered, though their percentage share in the panel mass is smaller.

Do photovoltaic panels contain hazardous materials?

With regard to cells made of silicon, which are by far the most widely used on the Luxembourg market, current production techniques do not require the use of any substances that are harmful to the environment.

Thin-film cells use elements such as cadmium or tellurium. The quantities used for the production of related modules are, however, minimal, especially for cells composed of cadmium telluride, known as CdTe. CdTe has low toxicity and the environmental consequences are considered negligible compared to the impact that could be caused by other means of electricity generation.

What is the environmental impact of photovoltaic panels?

The environmental impact is taken into account over the entire life cycle. Thus, environmental effects (such as the impact on climate change, the extraction of minerals, toxicity for human beings, etc.) are taken into consideration during the production and operation of the photovoltaic installation, including the savings made due to the energy produced during its life cycle.

Even if we consider that the production of certain photovoltaic panels requires scarce resources and hazardous materials, the environmental impact throughout their life cycle is less than that caused by the national or European electricity mix. This overall impact can be further reduced by recycling end-of-life panels or by refurbishing used panels for reuse in a second life.

Recycling law of photovoltaic panels in Luxembourg

In Luxembourg according to the law of 9 June 2022 on waste electrical and electronic equipment, the producer is responsible for the collection and processing of photovoltaic panels.

Producer means any natural person or legal entity who manufactures photovoltaic panels in Luxembourg or initially imports them onto the Luxembourg market. Any person established in another Member State or in a third country who, on a professional basis, supplies photovoltaic panels directly to a user in Luxembourg is considered a producer. In practice, in the majority of cases, this is the installer of the photovoltaic plant in Luxembourg.

Possibilities for owners to dispose of their old photovoltaic panels

For photovoltaic panels put on the market before 13/08/2005 :

in case of replacement of the photovoltaic panels, the take back of the old panel is free of charge and must be ensured by the company supplying the new equipment
in case of dismantling of the photovoltaic panel (non-replacement of the panel), the removal by a professional collector is done against payment by the user

For photovoltaic panels placed on the market after 13/08/2005 :

free take-back by the producer who bears the costs of collection and recovery of the photovoltaic panels.

In summary

In summary, the development of photovoltaic panel recycling technologies in Europe and Luxembourg is a key element of the sustainable development strategy, allowing for the recovery of valuable materials, waste reduction, and decreasing the negative environmental impact. Thanks to engagement at the national and EU levels, prospects for the efficient recycling of photovoltaic panels appear promising, significantly impacting the future of solar energy.

Take advantage of a free audit and receive a free quote for your photovoltaic installation.
Fill out the form below!

Ready to give your solar panels a second life? We’ll collect your old panels and recycle them for free when installing your new photovoltaic installation

Understanding SolarEdge Inverter Status LED

Voltmax — Tue, 02 Jan 2024 13:20:59 +0000

Understanding SolarEdge Inverter Status LED: Decoding LED Indicators and Switch Positions for System Performance Insights

Maximize your inverter’s efficiency with our comprehensive guide on interpreting the status and performance signals. Your inverter is equipped with a user-friendly switch and three color-coded LEDs, each providing crucial information about your system’s operation. Whether it’s identifying errors or assessing performance, our detailed tables explain the various LED colors and switch position combinations, ensuring you have all the necessary insights for optimal inverter performance.

Learn the significance of each LED color and switch position in our easy-to-follow guide, designed to help you quickly diagnose and understand your system’s status. Stay informed and maintain your inverter at its best with our expert insights.

Inverter Status LED

Main Indications

Description	LED
Inverter is communicating with the monitoring platform	Any combination of LEDs on condition that the blue LED is on.
System is producing	Any combination of LEDs on condition that the green LED is on.
AC is connected but the system is not producing	AC is connected but the system is not producing
System error	Any combination of LEDs on condition that the red LED is on.

System Performance Information

LED Page	Switch Position	LED
Power optimizers not paired S_OK
Power optimizers not paired No S_OK
Pairing
Wake-up/ Grid Monitoring
System Producing S_OK
System Producing No S_OK
Night mode (no production) S_OK
Night mode (no production) No S_OK
PID Rectifier S_OK
PID Rectifier No S_OK
Inverter is OFF (Safe DC) S_OK
Inverter is OFF (Safe DC) No S_OK
Inverter is OFF (DC not safe) S_OK
Inverter is OFF (DC not safe) No S_OK
Inverter configuration or reboot
Inverter firmware upgrade
No AC power
System error

AC Output Power Production Percentage

LED Page	Switch Position	LED
Percentage of AC Production: 0 – 33 %
Percentage of AC Production: 33 – 66 %
Percentage of AC Production: 66 – 100 %

Extended Inverter Lifespan through Proper Signal Interpretation: Regular monitoring and understanding of your inverter’s signals can not only enhance its performance but also extend its lifespan. By promptly responding to the indicators, you can prevent long-term damage and ensure that your inverter remains in top condition for a longer period.

Cost-Effective Operation and Energy Saving Tips:

This guide also sheds light on how understanding your inverter’s status can lead to more cost-effective operation. Learn how to adjust settings based on the LED indications to optimize energy use and save on electricity bills. This aspect is particularly beneficial for those looking to make their homes or businesses more energy-efficient.

Stay ahead in managing your energy system effectively with our in-depth guide. Embrace the full potential of your inverter by mastering the art of reading its signals and ensuring optimal performance.

If you want to know more about SolarEdge inverters, visit: https://www.solaredge.com/

Now you know the meaning of the Inverter Status LED, You can also talk to our advisor about preparing an offer and financing for your installation: Call us +352 661 444 831 or fill out the form on CONTACT PAGE

Thinking about going solar? With SolarEdge inverters, you get smart monitoring and maximum reliability from day one — contact us to design your perfect system

Switching to Photovoltaic Energy: Ecological and Financial Benefits

Voltmax — Mon, 27 Nov 2023 14:20:25 +0000

Switching to Photovoltaic Energy is more than just a trend—it’s a conscious step toward building a better future for both the planet and your wallet. By choosing solar energy, you’re actively contributing to the reduction of harmful emissions while gaining greater control over your energy costs.

Photovoltaics are at the heart of the renewable energy revolution. They allow you to produce your own clean electricity, reduce dependence on traditional utility providers, and protect yourself from rising energy prices. With modern technology and government support, switching to photovoltaic energy has never been more accessible or more financially rewarding.

This transition is not only environmentally responsible, but also economically smart. Solar panels significantly lower household energy bills, increase your property’s value, and offer long-term reliability with minimal maintenance. For homeowners and businesses alike, it’s a future-proof solution that pays off in many ways.

By investing in solar energy today, you become part of the shift toward sustainable development and energy independence. Discover how switching to photovoltaic energy can benefit both your home and the planet—and why thousands across Luxembourg are already making the change with Voltmax.

Photovoltaics and traditional energy sources

Solar energy is a renewable and inexhaustible source, unlike fossil fuels such as coal, natural gas or oil. The use of photovoltaics helps avoid the depletion of natural resources and reduces the negative impact on the climate.

Photovoltaics is clean energy

1. Zero CO2 emissions

Producing energy from photovoltaic panels does not generate carbon dioxide or other greenhouse gases that contribute to global warming. Reducing CO2 emissions is a key element in the fight against climate change.

1. Cleaner air and better health

Traditional energy sources cause the emission of harmful substances into the atmosphere, which negatively affects air quality and human health. Photovoltaics contributes to improving living conditions and protecting ecosystems.

1. Nature conservation

Installing solar panels on building roofs does not require the occupation of new land, which helps preserve the natural environment and biodiversity.

1. Water savings

Producing energy from fossil fuels requires huge amounts of water. Meanwhile, photovoltaics consumes minimal amounts of it, which is particularly important in regions affected by drought.

Financial benefits and energy independence

1. Lower electricity bills

Photovoltaic panels can significantly reduce electricity costs. Although the initial investment may seem high, the long-term savings outweigh the costs of traditional energy.

1. Independence from energy suppliers

By producing your own energy, you gain a stable supply and become independent from price fluctuations on the energy market.

1. Financial support and subsidies

In Luxembourg, there are numerous support programs that can provide funding for up to 95% of the costs of a photovoltaic installation. This is a great opportunity to reduce your initial costs and enjoy the benefits of renewable energy faster.

Additional benefits of photovoltaics

1. Supporting the green economy

The development of photovoltaics drives innovation and creates new jobs in the renewable energy sector, supporting the ecological transformation of the economy.

1. Better quality of life in cities

Photovoltaic panels help reduce the urban heat island effect, improving the comfort of residents and reducing the need for air conditioning.

1. Easy maintenance and long service life

Modern photovoltaic panels are characterized by a long service life and low maintenance requirements. Regular cleaning and inspections allow you to maintain high system efficiency for many years.

Switching to Photovoltaic Energy is an investment in long-term savings and sustainability.

Switching to solar energy is not only an ecological choice, but also a smart investment that brings economic benefits and increases energy independence. Installing photovoltaic panels allows you to reduce bills, improves air quality and supports the development of a green economy.

Don’t wait – check out the best solutions and start saving today!

Check out the best photovoltaic solutions for home -> Click

Ready to cut costs and lower your carbon footprint? Get in touch today and discover how switching to solar brings you both financial savings and ecological impact

Most common mistakes in photovoltaic installations

Voltmax — Thu, 07 Apr 2022 17:04:10 +0000

What should we pay attention to?

Are you planning to invest in photovoltaics, but you’re not sure which offer to choose? Do you want your installation to be safe and efficient, while also aiming for the lowest possible price? Photovoltaics must be of high quality – otherwise, it won’t be cost-effective or safe. The Luxembourg is characterized by very high levels of sunshine, which is why we have so many orchards and agriculture here. Favorable weather, fertile soil, and abundant sunshine are very good conditions for agriculture, but also for photovoltaic installations. The more sunlight, the faster the return on investment. Before you decide to install photovoltaics, get to know the most common mistakes related to the selection and installation of photovoltaic panels.

Most common mistakes in photovoltaic installations

Photovoltaics in Luxembourg are becoming increasingly popular. There are more and more micro-installations of photovoltaics, which may seem like an ideal situation, but in reality, many systems are poorly executed, and the responsibility for this lies primarily with the “professionals” in the photovoltaic industry, but also partly with the customers seeking excessive savings. So, how can you avoid costly mistakes?

Below, we present the most common mistakes in photovoltaic installations in Luxembourg, which may occur during the design and installation of selected solutions.

Shaded installation location

It is worth knowing that photovoltaics in the city of Luxembourg and surrounding suburban areas are very cost-effective due to the high sunshine levels in our region, and we should wisely use the possibilities provided by the location.

The placement of photovoltaic panels should enable maximum utilization of solar energy. Therefore, the photovoltaic installation is mounted on the southern sides of roofs or on ground structures facing south, where the panels can “collect” the most sunlight and produce more energy. There is no point in installing photovoltaics in poorly sunlit areas, as such an installation will not be efficient and will extend the payback period – reducing the quality and efficiency of the installation overall.

The most common mistakes concern the wrong choice of installation location. Avoid mounting on:

roofs shaded by other buildings or trees
cells can also be shaded by other PV installation elements or building parts, e.g., facades or bay windows.

Remember that shading just 3% of the PV panel’s surface can reduce the efficiency of the photovoltaic installation by up to 25%. However, there is a solution to this issue – choose the appropriate technology that uses power optimizers. This is the only way to effectively combat shading, says an expert from VOLTMAX, a Luxembourg-based company specializing in photovoltaic installations for businesses, individual customers, and agricultural farms.

Choosing a company that uses subcontractors

Choosing a contractor for a PV installation is one of the key issues. The company hired for this task must have experience and a team of qualified employees who constantly improve their skills.

Using an offer from an unknown and untested company may lead to problems later on and could me a mistakes with photovoltaic installation. When assessing the reliability of a contracting company, consider the installation cost estimate and the specification of used components and materials. If the proposed price is lower than the average market prices, there is a suspicion that the company will send subcontractors for the installation, who may not be familiar with the chosen solutions and install them improperly. Another problem is the lack of client awareness among the proposed technological solutions and components. Many representatives may offer components of very poor quality at an inflated price, while praising them. Therefore, the lack of curiosity and involvement of the client in the investment can cause many problems, and as life shows, cost-cutting can be detrimental and lead to long-term costs.

Lack of lightning protection system

A good practice to protect against storms and surge consequences is the installation of lightning protection devices. The need to place them on the roof is considered individually during a meeting with the photovoltaic company’s expert, whose services we decide to use.

Although such situations are very rare, they cannot be excluded. Panels should also be well placed in relation to the lightning protection elements – they must be located in a protected space but with the appropriate insulation gap.

Loose screws

Improper tightening of screws can lead to panels detaching from the roof surface or ground structure and damaging the system.

Any haste in installing photovoltaic installations is very deceptive – even a small oversight can have tragic consequences and cause not only financial losses but also endanger health or life.

Expert VOLTMAX – “From experience, we know situations where errors in photovoltaic installations in Luxembourg due to loose screws could result in a fire because the dislodgement of the screw leads to the failure of originally supported elements, which is not their purpose.”

Incorrectly laid photovoltaic cables

Incorrect cable laying can cause them to wear out; cables laid in a way that rub against each other or other elements can lead to unnecessary malfunctions.

Poorly laid cables can also be exposed to moisture, resulting in a short circuit. The quality of the cables themselves is also very important – the installation must last for many years (25-30 years), and for this to be possible, all even the smallest elements must meet specific requirements. The quality of the cabling used also affects the effectiveness of the generated power, which we will use or pass on to the grid.

Incorrectly connected photovoltaic panels

Next common mistakes is that incorrectly connected photovoltaic panels can result in incorrect operation of the photovoltaic installation or its failure, and in extreme cases, even a fire.

How does it look in VOLTMAX?

Expert VOLTMAX: “You must remember that a condition for the warranty of photovoltaic installations is the correct installation method. So, if the cells are connected incorrectly and get damaged, the complaint may not be accepted. For proper connections, high-quality cables and connectors must be used – relying on cheap substitutes of questionable origin is the shortest path to problems that can be avoided by opting for optimal quality and cost solutions.”

Improper tilt angle of panels

The tilt angle of photovoltaic panels should be chosen according to the specifics of the location where they will be installed. Panels used in photovoltaic installations can be mounted on both steep and flat roofs. In the latter case, a special structure is necessary to lift the cells and enable their proper positioning relative to the incident light.

If the panels have too small or too large a tilt angle, they will not properly utilize solar energy. The greatest power efficiency will be achieved by mounting panels at an angle of 25-36 degrees.

Incorrectly chosen design of the photovoltaic installation

Specialists involved in the creation of the installation design must consider the dimensions and load capacity of the roof, as well as the arrangement of individual installation elements in such a way that the installation is made according to the art and complies with all standards of proper installation while also fitting nicely into the appearance of our building, as the installation should please not only our wallet but also our eyes. A poorly executed project may result in the need for subsequent modifications, which will entail additional costs and delays.

The photovoltaic installation design for a building should be carried out by a person who has construction qualifications for designing electrical and electro-energy devices or a certificate in the field of photovoltaic systems issued by the President of the Office of Technical Inspection.

The installation elements should meet certain technical requirements:

Photovoltaic modules must have efficiency levels of not less than 16%, silicon cells, and mechanical strength of not less than 5,400 Pa.
The inverter should have a transformerless design, be characterized by at least IP65 protection class, and be equipped with convection or fan cooling.

Particularly important is the proper power rating of the installation; too low power will not allow covering the energy demand, and deficiencies will have to be supplemented from the grid, which will result in additional costs and reduced PV installation profitability. Too much power is also a mistake as it will cause unnecessary financial losses associated with the purchase of “stronger” solutions completely unsuited to our needs.

A flawless photovoltaic installation – it’s possible

Can we avoid problems with structural defects in photovoltaic installations? Expert VOLTMAX: “Of course, yes, you just need to meet the following points:” Now you know what is common mistakes in photovoltaic instalations.

The condition is to choose a reliable supplier.
Appropriately assess your needs, capabilities, and risks associated with owning a photovoltaic installation in the Luxembourg with our expert.
At home, when considering a photovoltaic installation contractor, I encourage you to make a appoitment with our expert: +352 691 986 312
Check the subsidies and financial aid programmes

Customers opting for photovoltaics should also consider its insurance – the cost of such a policy is not high, and insurance will cover potential costs not included in standard building insurance.

Want to avoid the most common mistakes in solar projects? Get in touch and let our experts design a flawless photovoltaic installation for your home or business