Voltmax Energy Solutions in Luxembourg

AFIR 2027: What the New EV Charging Rules Mean for Luxembourg

Voltmax — Thu, 08 Oct 2026 21:18:50 +0000

If you are planning an EV charger installation in Luxembourg, the installation date now deserves a place on your checklist. From 1 January 2027, new technical requirements will apply to newly installed and renovated charging points, including private wallboxes.
Zaptec has announced that its Pro and Go 2 chargers already have the hardware needed for the upcoming requirements. A software update is planned to deliver compliance. For anyone comparing chargers today, it helps to understand what is available now, what is still being prepared and whether an existing installation needs any changes.

What is AFIR?

AFIR stands for the Alternative Fuels Infrastructure Regulation. It has applied across the EU, including Luxembourg, since 13 April 2024.
For public EV charging, it sets rules covering access without a subscription, payment options and clear pricing. Related technical requirements also govern how charging points communicate with vehicles. These are separate from the operator’s responsibilities for running a public charging service

What changes in January 2027?

Newly installed or renovated public AC and DC charging points must support EN ISO 15118-20:2022. The same communication standard will apply to new or renovated private charging points operating in Mode 3 or Mode 4, which includes typical home wallboxes. Private Mode 2 charging has a separate requirement under EN IEC 61851-1:2019.
ISO 15118 defines how a vehicle and a charging point exchange information. A common standard helps equipment from different manufacturers work together.
The changes do not create a blanket requirement to replace existing chargers. They concern new installations and renovations. Routine maintenance, such as replacing a charging cable, is not considered a renovation under these rules.

What has Zaptec confirmed about Pro and Go 2?

According to Zaptec, the Pro already meets the AFIR requirements applicable to publicly accessible charging points in 2026, provided its software is kept up to date.
For 2027, the manufacturer says both Zaptec Pro and Zaptec Go 2 have suitable hardware. Compliance is to be delivered through a free firmware update, without replacing the chargers.
As of 8 October 2026, Zaptec expects the update to be available by 1 January 2027. The final release date has not yet been confirmed. If your installation is scheduled for 2027, check the current software status with your installer before proceeding.

Can you keep using an existing Zaptec Go?

Zaptec Go and Zaptec Go 2 are different products. Zaptec states that the original Go will not meet the requirements for new installations from 1 January 2027. However, units already installed can remain in use.

When reviewing a quotation, check the exact model name and the proposed installation date. This matters particularly if you are ordering a charger this year for a project that will be completed next year.

Will every charger offer Plug & Charge?

Plug & Charge allows a compatible vehicle to be recognised and authorised automatically when connected. Offering this service remains optional. New or renovated public charging points offering it from 2027 must comply with both ISO 15118-2 and ISO 15118-20. eur-lex.europa.eu

Ask which features will actually work with your vehicle and the chosen charging service. A reference to a communication standard alone does not tell you how your particular installation will operate.

Choosing an EV charger for your property

For a home installation, start with your daily routine. How far do you usually drive? How long is the car parked overnight? Will a second electric vehicle join the household? These answers help establish what you need from the charger.
Your electrical installation also needs attention. The proposed charging power should be assessed alongside other equipment in the building, especially if you have a heat pump or plan to add one. If solar panels or battery storage are part of the project, discuss the intended integration before choosing the charging equipment.
For a business, agree on who will have access. A charger reserved for staff raises different practical questions from one offered to visitors. Decide how users will be identified, whether sessions need to be billed and how additional charging points could be added later.
Before accepting a quotation, ask your installer to confirm the model, installation date, available functions and update arrangements. A clear specification makes offers easier to compare and gives you a useful record of what has been agreed.

EV charger installation in Luxembourg with Voltmax

Planning a charger for your home or business? Contact Voltmax to discuss your property, your vehicle and the way you expect to use it. We can help you assess the installation and choose suitable charging equipment, taking planned solar panels, battery storage and future needs into account.

Book a consultation with our team to discuss your EV charging project in Luxembourg.

The post AFIR 2027: What the New EV Charging Rules Mean for Luxembourg appeared first on Voltmax Energy Solutions in Luxembourg.

Voltmax at HOME EXPO 2026 in Luxembourg – Visit Us in Hall 8, Stand 8B11

Voltmax — Wed, 07 Oct 2026 17:57:01 +0000

Thinking about solar panels, battery storage or a home EV charger? Join Voltmax at HOME EXPO 2026 in Luxembourg. Meet our team, explore display equipment from Sigenergy, AIKO and Zaptec, and discuss solutions suited to your home.

You can also look forward to special offers, prizes and popcorn, alongside plenty of practical advice. Whether you have a project in mind or are exploring your options, we would be happy to talk.

When and Where Is HOME EXPO 2026?

HOME EXPO takes place from 8 to 11 October 2026 at Luxexpo The Box in Luxembourg–Kirchberg. Alongside the Semaine Nationale du Logement, the exhibition brings together professionals and visitors interested in building, renovating, furnishing and improving their homes.

You will find Voltmax in Hall 8, at Stand 8B11.

Address:
Luxexpo The Box
10, Circuit de la Foire Internationale
L-1347 Luxembourg–Kirchberg
North Entrance — Entrée Nord

Day	Opening hours
Thursday, 8 October	10:00–21:00
Friday, 9 October	10:00–19:00
Saturday, 10 October	10:00–19:00
Sunday, 11 October	10:00–19:00

Explore Equipment from Sigenergy, AIKO and Zaptec

Product photos and technical specifications are a useful starting point. Seeing equipment up close and speaking with a specialist can help you understand how it could fit into your everyday life.

At our stand, we will have display equipment from brands including Sigenergy, AIKO and Zaptec. Come and take a closer look, ask questions and discuss installation requirements, future expansion, operation and compatibility with other equipment in your home.

Our team will be available to talk about solar panels, battery storage and electric vehicle charging. We will help you identify what matters when comparing proposals and which information to gather before making a decision.

Solar Panels in Luxembourg — Start with Your Home’s Needs

Planning a solar PV installation starts with your electricity consumption, roof conditions and future plans. Available roof space matters, but so do the times when you use electricity and whether you intend to add a heat pump or electric vehicle.

At the Voltmax stand, you can discuss:

choosing the size of your PV system for current and future electricity needs;
how roof orientation and shading affect the design;
ways to use more of your solar electricity at home;
planning for future expansion.

Already have solar panels? You are welcome too. We can discuss options for developing your existing system and making better use of the electricity you generate.

Battery Storage and EV Charging — Planning a Connected System

Solar panels, battery storage and a home EV charger should be selected with your household’s overall energy use in mind. A useful discussion starts with when you generate and consume electricity, your daily driving habits and what you expect from a battery.

For battery storage, we can discuss capacity, compatibility and expansion options. If backup power is a priority, we will also explain the questions to ask: its availability and scope need to be checked for the specific system configuration.

For home EV charging, we can talk about the installation location, available electrical capacity and load management. These details help you plan a solution that suits your daily routine.

Special Offers, Prizes and Popcorn at the Voltmax Stand

HOME EXPO is also an opportunity to discover special offers prepared for visitors to our stand. Our team will explain the available promotions and their conditions in person.

We are bringing prizes and popcorn too, creating a welcoming setting for a conversation about your home. Come with a project, a list of questions or simply an interest in finding out what is possible.

If we have not had the chance to meet before, or our previous proposal did not suit your needs at the time, we would be delighted to talk again. Your plans, electricity consumption or investment priorities may have changed, making this a good opportunity to review your options.

How to Prepare for Your Visit

To help us discuss your home in more detail, consider bringing your annual electricity consumption or a recent bill, roof photos and basic information about any existing installation.

A short list of planned changes, such as buying an electric vehicle or installing a heat pump, will also be useful.

Do not have these details yet? Come and tell us about your plans. We can help you understand where to start and what information will be needed next.

See You in Hall 8, Stand 8B11

Meet Voltmax at HOME EXPO from 8 to 11 October 2026 at Luxexpo The Box. Explore the display equipment, benefit from our team’s expertise and discover options for your home.

For tickets and travel information, visit the official HOME EXPO website. Tram line T1 serves the Luxexpo stop near the North Entrance, while North and South car parks are available for visitors arriving by car.

We look forward to welcoming you in Hall 8, at Stand 8B11!

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Reference Power in Luxembourg – How to Reduce Peak Power Demand?

Piotr Porębski — Wed, 30 Sep 2026 18:52:50 +0000

A heat pump, electric vehicle charging, water heating and additional electrical appliances can significantly improve everyday comfort at home. However, if several of them operate at the same time, the power drawn from the grid can rise sharply. A typical example is the evening: the car starts charging after you return from work, the heat pump is running, the water heater switches on and the oven is being used in the kitchen. Each of these devices is operating normally, but together they can create a high peak in power demand.

In Luxembourg, this is particularly important because of the way some grid charges are calculated and the concept of reference power. This does not mean, however, that you have to give up convenience or limit the use of your appliances. The key is to distribute their operation more effectively over time and make use of photovoltaics, energy storage and an energy management system to reduce simultaneous high power demand from the grid as much as possible.

What is reference power in Luxembourg and why does it matter?

Reference power in Luxembourg is expressed in kilowatts (kW) and serves as a benchmark for the amount of power drawn from the grid. If a household draws more power than its assigned reference level for a certain period of time, this may affect the amount of grid charges. However, it is not a maximum power limit that users are prohibited from exceeding, nor does exceeding it automatically result in the electricity supply being disconnected. The main objective is to reduce prolonged and recurring peaks in power demand.

It is also worth explaining the difference between a kilowatt and a kilowatt-hour. A kilowatt (kW) describes power – how much energy appliances require at a given moment – while a kilowatt-hour (kWh) describes how much energy has been consumed over a certain period of time. Two homes may therefore use the same amount of energy over the course of a day, but the one in which an electric car, heat pump and other appliances operate simultaneously may experience significantly higher peaks in power demand. This distribution of electricity consumption over time is particularly important in relation to reference power.

Why can an electric car and a heat pump cause high power demand peaks?

An electric car or heat pump alone does not necessarily cause a problem with high power demand. The issue arises when they operate at the same time as other appliances with high electricity requirements, such as an oven, induction hob, water heater or tumble dryer. Their power demand then adds up, causing the amount of power drawn from the grid to rise significantly for a short period.

A good example is the evening, when the car starts charging after you return home, the heat pump is heating the building, hot water is being prepared and a meal is being cooked at the same time. Each device is operating normally, but together they can create a high power demand peak lasting several or even several dozen minutes. That is why it is important to consider not only how much energy a home uses over an entire day, but also when individual appliances are operating and at what power. If their operation is spread out over time, the same household can consume a similar amount of energy while drawing significantly less power from the grid during the most demanding periods.

Can photovoltaics and energy storage reduce peak power demand?

Yes, both solutions can help reduce the amount of power drawn from the grid, although they work in different ways. The best results are achieved when they are properly integrated with an energy management system.

Photovoltaics

A photovoltaic installation reduces grid consumption when it is generating electricity and covering the household’s current energy demand. If the heat pump is running during the day, the car is charging or other high-power appliances are being used, part of the required energy can come directly from the PV panels.

However, photovoltaics cannot prevent every power demand peak. If high demand occurs in the evening, at night or during periods of low winter production, electricity has to be drawn from the grid unless the home is also equipped with an energy storage system.

Energy storage

An energy storage system is particularly useful when household power demand rises sharply. For example, if the heat pump, EV charger and other appliances are operating simultaneously, the battery can supply part of the required power and therefore reduce the amount drawn from the grid.

This means that not all the power required at a given moment has to come from the electricity grid. The best results are achieved with a system in which photovoltaics supply the home and charge the battery during the day, while the stored energy is used later during periods of higher demand.

However, an energy storage system will not automatically reduce peaks in every situation. Proper configuration and energy flow control are required so that the battery actually supports the household during periods of highest power demand.

How can you check your power demand profile and identify opportunities for optimisation?

The best place to start is by checking your current reference power and data from the smart meter. It is worth looking at the times when the home draws the most power from the grid and whether high values occur regularly, for example in the evening after household members return home.

Smart meters and energy sensors can be helpful in this type of analysis, including SolarEdge solutions and Sig Sensor devices available from Voltmax. They make it possible to monitor energy flows within the home and see when grid consumption increases and when demand is covered by the photovoltaic installation or energy storage system. This makes it easier to identify recurring peaks and determine which appliances are operating at the same time.

The next step is to identify which devices are operating simultaneously during those periods. These may include the EV charger, heat pump, water heating system or kitchen appliances. It is then worth checking whether some of them can operate at different times or at reduced power without affecting everyday comfort.

Measurement itself is only the starting point. Voltmax can combine data from the meter with a properly configured photovoltaic installation, energy storage system and appliance control. Such a system monitors the situation continuously and helps address the source of the problem, for example by changing EV charging times, adjusting charger power or using stored energy during periods of highest demand. The specific possibilities depend on the equipment installed in the home and its configuration.

Finally, it is worth assessing whether part of the demand can be covered by the photovoltaic installation or energy storage system. If the highest power demand occurs during the day, current PV production may play a more important role. If peaks occur in the evening, an energy storage system or appropriate appliance control may be more helpful. The key consideration is therefore not only how much energy the home uses, but above all when it is consumed and how much power is required at a given moment.

How can Voltmax help reduce peak power demand?

Effective optimisation should begin with an analysis of how the household actually uses electricity. Voltmax can assess the current power demand profile, reference power, heat pump operation, EV charging patterns and photovoltaic production.

The analysis can also take into account the capacity and operating strategy of the energy storage system, communication between individual devices and the use of an energy management system. Based on this information, suitable settings and operating schedules can be selected to reduce unnecessary overlap between high-power appliances and lower peak demand without compromising comfort.

Would you like to know when your home draws the most power and what you can do about it? Contact Voltmax. We will analyse how energy is used in your home and propose a solution tailored to your installation, heat pump and EV charging setup. See how smart metering and properly configured control can help you reduce peak power demand without giving up everyday comfort.

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Photovoltaics on a Small Roof – How to Make the Most of the Available Space

Piotr Porębski — Sun, 06 Sep 2026 18:34:40 +0000

A small roof does not rule out a well-designed photovoltaic installation. When space is limited, the precise layout of the panels, their dimensions and efficiency, and the way the entire system is adapted to the conditions of the specific building become much more important. The goal is not simply to fit as many panels as possible, but to achieve the highest possible energy production from the available roof area.

In practice, what matters is not the total roof area, but the space that can actually be used for installation. This is affected by factors such as the shape of the roof, chimneys, roof windows, shading and the direction in which the photovoltaic panels can be installed. That is why, on a small roof, a well-prepared design and comparison of several possible panel layouts can be significantly more important than on a large, simple roof surface.

How much space is actually available for panels on a small roof?

With a small roof, the total surface area should not be the only consideration. What matters much more is how much space can actually be used for photovoltaic panels after taking into account chimneys, roof windows, dormers, vents, antennas and areas that are regularly shaded.

The final layout is also influenced by the mounting method, the roof structure and the need to maintain access to selected elements. The design should also take into account structural safety, roof loads and the ability to secure the entire system correctly. In practice, this means that a 50 m² roof does not necessarily provide 50 m² of usable space for photovoltaics. Some areas may need to be excluded from installation or may be less favourable in terms of energy production.

Which panels make the best use of limited roof space?

On a small roof, it is not worth looking only at the rated power of an individual panel. Its efficiency, exact dimensions and the total amount of power that can be installed within the available area are equally important. A high-power panel may simply be larger, which means that fewer modules may fit on a small or irregular roof.

That is why, when designing the system, it is worth comparing not only the wattage of each panel, but also its actual dimensions and how it can be arranged on the roof. A good example is that a 500 W panel does not necessarily have to be a better choice than a 450 W model if it is significantly larger and its dimensions mean that fewer modules can be installed. In such a case, what matters is which option delivers the greater total system capacity and makes better use of the available space.

On a small roof, panels with high efficiency and dimensions suited to the specific roof surface are particularly important. Sometimes even a small difference in the width or length of a module can determine whether an additional panel can be installed and the total capacity of the system increased.

How should panels be arranged on a small or complex roof?

On a small or irregular roof, the way the panels are arranged can be just as important as the modules themselves. Sometimes simply changing their orientation can deliver a better result. Panels can be installed vertically or horizontally, and this difference can determine whether a narrow section of the roof can be used, whether a roof window, chimney or dormer can be avoided, and whether an additional module can be fitted.

It is also worth checking whether more than one roof surface can be used. Photovoltaic panels do not have to be installed exclusively on a south-facing roof. When space is limited, east- and west-facing surfaces can also deliver good results. This makes it possible to increase the total area available for the installation while also spreading energy production over a longer part of the day.

A flat roof is a separate case. Here, the panels are not limited by the natural pitch of the roof, so different configurations can be compared. An east-west layout often allows modules to be installed more densely than traditional south-facing rows because it requires smaller gaps between successive rows. On a small roof, this can make it possible to install more panels and use the available surface more effectively.

On a complex roof, it is therefore worth avoiding a single standard layout. The best arrangement should be based on the shape of the roof surfaces, the available space, shading and the expected energy production from individual sections of the roof.

Can photovoltaics on a small roof meet a home’s energy needs?

In many cases, photovoltaics on a small roof can meet a significant share of a home’s energy needs, but this cannot be assessed on the basis of roof size alone. What matters much more is the capacity that can actually be installed, how much energy the panels can generate over the course of a year and the building’s actual electricity consumption.

A small roof with well-selected panels, favourable orientation and limited shading can provide surprisingly good energy production. Conversely, a larger roof does not always guarantee better results if some of the panels operate under poor conditions. That is why a project should be assessed primarily in terms of estimated annual energy production and compared with the household’s actual demand.

If calculations show that the roof cannot accommodate a system large enough to cover the entire demand, the installation may still make sense as a way to reduce the amount of electricity purchased from the grid. In such a situation, additional surfaces can also be considered, such as the roof of a garage, carport or another outbuilding.

How can Voltmax design photovoltaics for a small roof?

With a small roof, the most important factor is making effective use of every available part of the surface. Before installation, Voltmax can analyse the actual space available for panels, the shape and orientation of the roof surfaces, shading and the structural possibilities of the roof.

On this basis, different panel layouts can be compared, modules with suitable dimensions and efficiency can be selected, and expected energy production can be estimated. The goal is to create a design that makes the best possible use of the conditions of the specific building and delivers the highest practical energy production from the available space, without artificially increasing the number of panels at the expense of performance or installation safety.

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5, 10 or 15 kWh Energy Storage System – How to Choose the Right Capacity?

Piotr Porębski — Fri, 21 Aug 2026 17:37:05 +0000

When looking for an energy storage system, one of the key decisions will be choosing the right capacity – 5, 10 or 15 kWh? This choice should not be based solely on the capacity of the photovoltaic installation. Two PV systems with identical specifications may require completely different storage capacities if, in one home, most of the energy is consumed as it is generated, while in another the highest demand occurs only in the evening and at night.

When selecting the capacity of an energy storage system, the most important factors are therefore the amount of surplus energy generated by the photovoltaic installation, electricity consumption outside peak production hours and the purpose the battery is intended to serve. A different capacity may be appropriate if the main goal is to increase self-consumption, another if the aim is to reduce electricity purchased from the grid, and yet another if the storage system is also intended to provide backup power.

What determines the required capacity of an energy storage system?

The capacity of an energy storage system should be based primarily on actual energy production and consumption data. The key questions are how much surplus energy the photovoltaic installation can generate on a regular basis and how much electricity the home needs after the panels have passed their peak production period.

For example, if on a sunny day the installation exports around 6-8 kWh of surplus energy to the grid, while the household draws a similar amount of electricity from the grid during the evening and night, this range may be a useful starting point when selecting storage capacity. A larger battery will not always be better if the installation cannot regularly charge it or the household is unable to use the stored energy.

Only at the next stage should additional factors be considered, such as a planned increase in electricity consumption, the presence of a heat pump, air conditioning or an EV charger, and whether the storage system is also intended to provide backup power.

5, 10 or 15 kWh energy storage - when is each capacity a good choice?

The capacity of an energy storage system should reflect the actual way energy is used, rather than the assumption that a larger battery is always better. The examples below should be treated as general usage scenarios, as the optimal capacity depends primarily on the energy production and consumption profile.

Storage capacity	When is it worth considering?
around 5 kWh	For low or moderate evening consumption, smaller PV surpluses and the need to shift a few kWh of energy from daytime production to later hours
around 10 kWh	For larger and regular surpluses, higher electricity consumption in the evening and at night, and the presence of higher-demand electrical devices
around 15 kWh	For high energy demand, large regular surpluses, electric heating, a heat pump, EV charging or greater backup power requirements

When to choose 5 kWh energy storage system

An energy storage system with a capacity of around 5 kWh can be a good solution for households that do not use large amounts of electricity after photovoltaic production has ended. It is particularly suitable where the installation generates moderate surpluses and the main objective is to increase self-consumption and use more self-generated electricity in the evening. This capacity may be sufficient, for example, to power basic household appliances, lighting or electronics during hours when the panels are no longer generating electricity. However, this does not mean that a 5 kWh battery is intended exclusively for small PV installations.

When to choose 10 kWh energy storage system

A capacity of around 10 kWh is an intermediate option that may be suitable for households with higher electricity consumption and regular photovoltaic surpluses. It makes particular sense when a significant proportion of consumption occurs in the evening and at night, or when the home uses higher-demand devices such as a heat pump or air conditioning. If, on a typical sunny day, the installation can supply several to more than ten kWh of surplus energy to the battery and a similar amount is later required by the building, a storage capacity of around 10 kWh may be a good starting point for further calculations.

When to choose 15 kWh energy storage system

An energy storage system with a capacity of around 15 kWh is worth considering primarily in buildings with high electricity consumption and large, regular surpluses from the PV installation. It may be justified in properties equipped with a heat pump, electric heating, air conditioning, an EV charger or where there are greater backup power requirements.

However, a larger capacity does not automatically mean greater savings. If the installation usually generates only a few kWh of surplus energy per day, a 15 kWh battery may remain only partially charged for much of the time and fail to make full use of its potential. It should therefore be selected when actual consumption and production justify this capacity, rather than simply as a larger version of a smaller storage system.

How does Voltmax help select the right energy storage capacity?

The selection of an energy storage system should be based on actual data rather than solely on the capacity of the photovoltaic installation or the nominal capacity of the battery. Voltmax can analyse PV production, the amount of surplus energy generated, the hourly electricity consumption profile and the largest energy consumers in the building.

We can also take into account planned increases in electricity demand, such as the installation of a heat pump, air conditioning or an EV charger, as well as backup power requirements. Another important element is assessing the existing inverter and the technical possibility of integrating the storage system with the current installation. This makes it possible to select a capacity that reflects the actual needs of the building and the way energy is used.

Interested? Contact us – at Voltmax, we will help you choose the right energy storage system for your needs.

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Is It Worth Adding an Energy Storage System to an Existing Photovoltaic Installation?

Piotr Porębski — Fri, 14 Aug 2026 18:20:33 +0000

An energy storage system can be added to an existing photovoltaic installation in many cases, which means that expanding a PV system does not necessarily require rebuilding the entire installation from scratch. Such an upgrade can increase the use of self-generated energy, reduce electricity drawn from the grid and, under the right conditions, lead to lower energy bills. An additional benefit may be the possibility of preparing the installation for backup power operation.

However, simply connecting a battery to the existing installation is not always enough. Compatibility with the inverter, the way the entire system operates, the times of highest energy consumption and the cost of the upgrade are also important. In some installations, a relatively simple retrofit solution will be possible, while in others it may be necessary to replace or expand selected components. That is why, before choosing an energy storage system, it is worth checking how the existing photovoltaic installation performs and which upgrade option will be the most appropriate.

Can an energy storage system be added to an existing photovoltaic installation?

Yes, in most cases an energy storage system can be added to an existing photovoltaic installation. However, this does not mean that every system can be expanded in exactly the same way. The type of inverter currently in use, the way individual components are connected and the existing system configuration are all particularly important.

If the current inverter is designed to work with an energy storage system, the upgrade may be relatively straightforward. In older or standard installations, it may be necessary to install an additional battery inverter or replace the existing unit with a hybrid inverter.

When is an energy storage system for an existing PV installation cost-effective?

An energy storage system for an existing photovoltaic installation is most likely to be cost-effective when the system regularly produces surplus electricity that cannot be used immediately. This is particularly relevant for households where residents are away during the day and the highest energy consumption occurs in the evening, at night or in the morning. In such cases, electricity produced around midday can be stored and used later instead of being exported to the grid.

The electricity settlement system also matters. Under a net-billing system, an energy storage system can help increase self-consumption and reduce the amount of electricity purchased from the grid, especially during periods when energy is more expensive. The investment may be particularly beneficial in buildings equipped with a heat pump, air conditioning, electric heating or an EV charger, as these devices increase electricity demand and make it easier to use more of the energy generated by the photovoltaic installation.

However, simply having photovoltaic panels does not mean that an energy storage system will always be cost-effective. If most of the generated energy is already consumed directly, surplus production is limited or the cost of upgrading the installation is high, the economic benefit may be much smaller. That is why, before purchasing a battery, it is worth analysing the actual energy production and consumption profile rather than relying solely on the installed PV capacity.

What should be checked before choosing an energy storage system?

Before choosing an energy storage system, several key factors should be analysed, as they affect both the profitability of the investment and the subsequent operation of the entire system.

Energy production and consumption profile

The most important step is to determine how much energy the installation produces, how much of it is exported to the grid and at what times the building uses the most electricity. This information helps determine what battery capacity is actually needed. A storage system that is too small may not be able to make full use of the available surplus, while one that is too large will unnecessarily increase the cost of the investment.

Condition and compatibility of the installation

The next step is to assess the existing photovoltaic installation, particularly the inverter, protections and the way individual components are connected. Not every inverter can work directly with an energy storage system, so in some cases it is enough to choose a compatible battery, while in others an additional battery inverter or replacement of the existing unit may be necessary. It is also worth taking into account any future expansion of the PV installation or the addition of new energy-consuming devices.

Backup power

If the energy storage system is also intended to provide backup power, it is necessary to check whether the selected system actually supports this function. Simply having a battery does not automatically mean that the entire house will remain powered during a grid outage. Appropriate inverter functions, additional switching components and a clear decision on whether backup power should cover the entire building or only the most important circuits, such as the refrigerator, lighting, internet connection or heating system, are required.

Does every photovoltaic system owner need an energy storage system?

An energy storage system is not a solution that will automatically be cost-effective for every photovoltaic installation. It can provide the greatest benefits where regular production surpluses occur and a significant share of energy is only needed after the panels have stopped generating. On the other hand, where daytime self-consumption is already high or surplus production is limited, the economic effect of adding a battery may be smaller.

An energy storage system is worth serious consideration	It may be better to postpone the investment
A large share of production is exported to the grid	Most of the energy is consumed directly
Peak consumption occurs in the evening	The installation produces only small surpluses
The building operates under a net-billing system	The upgrade would require replacing many system components
New energy-consuming devices are planned	There is insufficient data on the actual consumption profile
Properly designed backup power is important	The only argument is a temporarily available subsidy

An energy storage system should therefore not be sized solely according to the capacity of the photovoltaic panels or purchased simply because batteries have become a popular addition to PV installations. The decision should be based on actual measurements of energy production and consumption, electricity bills and a technical assessment of the existing installation. Only then is it possible to determine the appropriate storage capacity and assess whether the investment will genuinely deliver the expected benefits.

How can Voltmax help expand a photovoltaic installation with energy storage?

Expanding an existing photovoltaic installation should be preceded by an analysis of its parameters, the energy consumption profile and the available technical options. Voltmax helps assess the compatibility of the existing system, select the appropriate storage capacity and plan the upgrade so that it increases the use of self-generated energy and adapts the operation of the installation to the building’s actual needs.

As part of these solutions, we offer Breeze energy storage systems, which can be matched both to new photovoltaic installations and to suitably prepared existing systems. The selection of a specific solution is preceded by a technical analysis, ensuring that the storage system is not simply an additional accessory to the photovoltaic installation, but an integral part of the entire energy management system.

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Should a Building Be Thermally Upgraded Before Installing Photovoltaics?

Piotr Porębski — Thu, 30 Jul 2026 15:12:20 +0000

A photovoltaic installation can be planned either before a building undergoes thermal modernisation or after the work has been completed. There is no single sequence that is suitable for every property, as the decision depends on several factors: the condition of the roof, the quality of the insulation, the heating system and any planned changes in energy consumption. Thermal modernisation of a house should be approached differently from the modernisation of a barn, warehouse or other farm building. Before starting the investment, it is therefore worth determining whether any roof renovation, insulation work, replacement of the heating source or installation of additional equipment is planned in the near future. Such an analysis – and, in more complex cases, an energy audit before installing photovoltaic panels – makes it easier to define the scope of work and correctly size the photovoltaic system after thermal modernisation.

Is thermal modernisation necessary before installing photovoltaics?

Not every building needs to undergo comprehensive modernisation before photovoltaic panels are installed. A PV system can also be installed earlier, provided that the condition of the roof, the planned renovation work and the building’s future energy demand are known. This is particularly important when insulation work, roof joinery replacement, heating system modernisation or the installation of a heat pump is planned for the coming years.

Thermal modernisation and photovoltaics serve different purposes. Thermal modernisation reduces energy losses and improves the comfort of using the building, while photovoltaics generate electricity. The best results are achieved when both processes are properly coordinated, allowing the photovoltaic installation to be used as effectively as possible.

How does thermal modernisation affect photovoltaic system sizing?

Thermal modernisation can change a building’s energy demand, which is why the capacity of a photovoltaic installation should not be selected solely on the basis of current electricity bills. After insulating the walls or roof, or replacing windows and doors, the amount of electricity used for heating may decrease. On the other hand, the subsequent installation of a heat pump, air conditioning or mechanical ventilation may increase electricity demand.

For this reason, a PV installation should be designed with the building’s future use in mind. This makes it possible to match the system capacity more accurately to actual needs after the planned work has been completed and reduces the risk of undersizing or oversizing the installation.

What should come first - thermal modernisation or photovoltaics?

There is no single correct sequence of work that is suitable for every building. The decision should depend primarily on the condition of the roof, the scope of the planned modernisation and the building’s future energy demand.

Thermal modernisation first

This sequence is particularly advisable when the building is already heated using electrical equipment such as a heat pump, electric heating mats or air conditioning with a heating function. Insulating the building, renovating the roof or replacing windows and doors first reduces energy demand, after which the photovoltaic installation can be sized according to the building’s actual long-term electricity consumption.

Photovoltaics first

Installing a photovoltaic system may be the first stage if the roof is in good condition and no major thermal modernisation work is currently planned. When sizing the installation, however, future changes should be taken into account, especially a planned switch to electric heating, such as a heat pump, electric heating mats or air conditioning. This helps avoid a situation in which the PV installation proves too small once electricity consumption increases.

Both investments planned together

Planning thermal modernisation and photovoltaics together makes it possible to properly coordinate work involving the roof, insulation, heating system and electrical installation. This does not mean that all work has to be carried out at the same time. Individual stages can be spread over time, while maintaining the correct sequence and matching the photovoltaic installation to the building’s future energy demand.

How does Voltmax combine thermal modernisation with photovoltaics?

Voltmax assesses a building from a broader perspective than simply the available surface area for photovoltaic panels. We take into account, among other things, the condition of the roof, the level of insulation, the heating system, current energy consumption and planned changes such as the installation of a heat pump or air conditioning, or the replacement of windows and doors.

This allows thermal modernisation and photovoltaics to be planned as one coherent process, even if the individual stages are carried out over time. It makes it possible to better match the scope of the modernisation, the capacity of the PV installation and the sequence of work to the building’s actual needs.

The post Should a Building Be Thermally Upgraded Before Installing Photovoltaics? appeared first on Voltmax Energy Solutions in Luxembourg.

Which direction should photovoltaic panels face?

Piotr Porębski — Sat, 18 Jul 2026 13:23:06 +0000

The direction in which photovoltaic panels are installed affects energy production, system efficiency and the overall return on investment. In most cases, a south-facing orientation delivers the best results, but the optimal setup also depends on the roof layout, pitch, shading, available surface area and the building’s energy consumption profile. East- and west-facing panels can also perform very well, particularly when electricity consumption is higher in the morning or afternoon. The direction of the panels should therefore be selected individually, following an analysis of the roof, solar exposure and energy consumption profile.

The best direction for photovoltaic panels

In most cases, south is the best direction for photovoltaic panels because it allows the system to achieve the highest annual energy production, especially on an unshaded roof with a suitable pitch. However, this does not mean that a PV installation only makes sense on a perfectly south-facing roof. South-east and south-west orientations also perform very well, while an east-west layout may be suitable in certain situations, particularly when energy is mainly consumed in the morning and afternoon. North is generally the least favourable direction, so this option should only be considered when no better surface is available and a production simulation confirms that the investment remains worthwhile. Even then, a north-facing PV installation may still provide benefits in certain circumstances.

Panel orientation	Assessment	When it makes sense
South	the most optimal option	when the roof is unshaded and the goal is to maximise energy production
South-east / south-west	a very good compromise	when the roof does not face directly south but still receives good solar exposure
East-west	a good daily production profile	when energy consumption is concentrated mainly in the morning and afternoon
North	the least favourable option	recommended only in exceptional cases, following a roof assessment and production simulation

Why does the direction of photovoltaic panels matter?

The direction of photovoltaic panels affects how much solar radiation reaches the modules and at what time of day the installation produces the most energy. South is usually the best orientation, although slight deviations towards the south-east or south-west also perform well. For year-round installations, a tilt angle of approximately 30-35° is often used, while east-west systems are typically installed at a slightly lower angle to distribute production more evenly throughout the day. The direction of the panels, also known as the azimuth, should be selected not only to maximise annual yield, but also to match the times when energy is actually used in the building.

South-facing photovoltaic panels - when are they the best choice?

The direction of photovoltaic panels matters because it determines how much sunlight reaches the modules and at what time of day the system generates the most energy. South-facing panels usually reach their highest production around midday, east-facing panels generate more in the morning, and west-facing panels perform more strongly in the afternoon. When designing an installation, it is therefore worth considering not only the annual yield, but also the hourly production profile and the way energy is consumed in the building.

Can photovoltaic panels face north?

Photovoltaic panels can also be installed on a north-facing roof, but this option requires a more detailed analysis. A north-facing roof usually receives less direct sunlight, which means that energy production may be lower than with a south-, east- or west-facing orientation. However, this does not necessarily mean that such an installation is not worthwhile. With a low roof pitch, no better available surface or as an extension of a larger PV installation, a north-facing system may still be worth considering, particularly after carrying out a yield simulation and assessing the expected return on investment.

What is the optimal tilt angle for photovoltaic panels?

The optimal tilt angle for photovoltaic panels depends on the location, roof orientation, type of mounting system and the purpose of the installation. In Central Europe, an angle of approximately 30-40° is often recommended for year-round systems, but this is not a strict rule. In many cases, it is more practical to use the existing roof pitch rather than complicate the installation with an additional mounting structure. The profitability of a photovoltaic installation is influenced not only by the panel angle, but also by their direction, shading, available surface area and the way energy is consumed in the building.

Panel shading - a greater problem than an imperfect orientation

Shading can reduce the performance of a photovoltaic installation more significantly than a less-than-ideal panel orientation. Before installation, it is important to check whether the modules may be shaded by trees, chimneys, dormer windows, antennas, neighbouring buildings or other roof elements. Seasonal shading should also be taken into account, as the sun is lower in winter and shadows are longer than in summer. Only a proper shading analysis can determine which part of the roof is best suited for photovoltaics.

Before installing the panels, it is particularly important to check:

trees and tall shrubs,
chimneys and dormer windows,
neighbouring buildings,
antennas and rooftop installations,
shading caused by subsequent rows of panels,
dirt, leaves and accumulated snow.

How does Voltmax select the direction and angle of photovoltaic panels?

Voltmax selects the direction and tilt angle of photovoltaic panels based on an analysis of the individual building. We assess the roof orientation, pitch, available surface area, technical condition, shading and actual energy consumption. This allows us to determine the appropriate system capacity, panel layout and positioning that best match the building’s conditions and the way electricity is used.

Voltmax supports investors at every stage, from analysis and system design to photovoltaic installation and planning for future expansion. If you would like to find out whether your roof is suitable for photovoltaic panels and which system configuration would be the most cost-effective in your specific circumstances, it is worth consulting the project before making a final installation decision.

The post Which direction should photovoltaic panels face? appeared first on Voltmax Energy Solutions in Luxembourg.

Replacement of Old Photovoltaic Installations on Farms

Piotr Porębski — Sat, 27 Jun 2026 09:04:37 +0000

In many agricultural farms, photovoltaic installations have already been operating for quite some time on the roofs of houses, barns, cowsheds, machinery halls, workshops, garages, shelters and other farm buildings. Some of them still generate energy, but they do not always achieve yields that match today’s technological capabilities or the current needs of the farm. Over time, module efficiency, inverter condition, protection quality, technical requirements and the way energy is used in agricultural buildings all change. Replacing an old photovoltaic installation does not always mean dismantling the entire system and installing panels from scratch. In many cases, PV modernisation may be enough: replacing the inverter, improving protections, repairing wiring, expanding the installation or implementing more accurate production monitoring. However, if the system is outdated, prone to failure, no longer suited to current energy consumption or installed on a roof that requires renovation, a complete replacement of the installation may be more justified. For farmers and farm owners in Luxembourg, photovoltaic modernisation is an opportunity to reassess the potential of farm buildings. When larger works are planned, it is worth checking whether the best solution will be new photovoltaic panels on the existing roof, expansion of the current system or a solar roof for the farm. A well-planned replacement makes it possible not only to replace older devices, but above all to better match the PV installation to the farm’s actual operating profile and use the available roof surface more efficiently.

Why do old photovoltaic installations on farms need inspection?

Photovoltaic installations are becoming increasingly popular, but some owners of houses and other buildings decided to install them quite some time ago. An old photovoltaic installation on a farm may still work, but that does not mean it performs as well as it should. Photovoltaics are not a completely maintenance-free system throughout their entire operating life. Over the years, the efficiency of panels, the condition of the inverter, the quality of connections, wiring, protections and mounting structure all gradually change. Technical standards and the needs of the farm itself also change.

In the case of farms and agricultural buildings, there are additional factors: dust, dirt, moisture, more demanding roof conditions, seasonal operation of equipment and variable energy consumption throughout the year. An installation mounted several or more than ten years ago may have been well matched to the needs at that time, but today the farm may include different buildings, more equipment or a higher demand for electricity.

That is why an inspection of an old photovoltaic system should cover more than just the panels. It is worth checking production from previous seasons, inverter operation, the condition of cables, connectors, protections, the mounting structure and monitoring. Only after such an assessment is it possible to decide whether a minor modernisation is enough, or whether replacing the old photovoltaic installation with a new, more efficient system will be the better solution.

Old photovoltaics may work, but not always perform well

The fact that an old photovoltaic system is still operating does not necessarily mean that it is working optimally. A farmer may see production in an app or on a meter, but the actual yield of the installation may be lower than it was a few years ago. The difference often becomes clear only when comparing data from previous seasons, energy bills and current consumption on the farm. The reason may be the natural decrease in panel efficiency, dirt, micro-damage, weaker inverter performance, wiring issues or shading that did not exist before. That is why, before deciding to replace the panels, it is worth checking the entire installation, not just whether the system still produces electricity.

When is it worth considering replacing photovoltaic panels on a farm?

Replacing photovoltaic panels on a farm makes sense when the installation stops working as it should and maintenance alone does not solve the problem. The point is not to replace panels after a certain number of years simply because they are old. Specific symptoms are more important: a clear drop in production, visible module damage, frequent failures or the inability to repair the system on reasonable terms. A farmer should pay particular attention to situations where energy production is noticeably lower than in previous seasons, despite similar weather conditions. Cracked glass, discolouration, signs of overheating, delamination, damaged frames or modules that perform clearly worse than the rest of the installation may also be warning signs. In older systems, the lack of spare parts and outdated technology can also become a problem, making it difficult to expand the installation or connect it to a newer inverter.

On an agricultural farm, the decision to replace panels should be made after inspecting the entire installation, not only based on the age of the modules. Sometimes replacing the inverter, improving the wiring or upgrading the protections is enough. However, if the panels are damaged, heavily worn, unreliable or no longer meet the farm’s needs, PV modernisation may be a better solution than continuing to maintain the old system.

Do you need to replace the roof when replacing photovoltaics?

When replacing an old photovoltaic installation, it is first necessary to check whether the roof is still suitable for new panels. Installing a new system on a covering that will require renovation in a few years may mean double costs: dismantling the installation, repairing the roof and reinstalling the PV system. That is why, before modernisation, it is worth assessing the condition of the roof covering, watertightness, structural load-bearing capacity, corrosion of elements, water drainage and service access. On agricultural farms, this applies especially to large roofs on barns, cowsheds, machinery halls and storage buildings. Such surfaces are very well suited to photovoltaics, but they were not always designed for additional loads and many years of PV system operation. If the roof is old, leaking, damaged or contains asbestos, it is better to plan its replacement together with the new photovoltaic system.

Learn more about replacing an asbestos roof.

Photovoltaics on farm buildings - where should they be installed?

Replacing an old photovoltaic installation is a good opportunity not to copy the previous panel layout one-to-one. The farm may have changed over the years: new buildings or equipment may have been added, work seasons may have changed or energy consumption may have increased. That is why, before installing new photovoltaics, it is worth checking which buildings use the most electricity and at what times energy is needed the most.

Panels can be installed on various farm buildings. However, it is worth remembering that the best roof is not always the largest one. Its technical condition, load-bearing capacity, orientation, shading, service access and distance from the place where the energy will be used all matter. On agricultural farms, electricity from photovoltaics can power, among other things, ventilation, pumps, cold storage, milking machines, lighting, a workshop, office, sorting areas and storage buildings. That is why a new PV installation should be matched to the real operating profile of the farm, not only to the available roof surface. In Luxembourg, this is particularly important because well-planned photovoltaics on farm buildings make it possible to use existing roofs without taking up land.

Solar roof instead of traditional panels - when does it make sense?

A solar roof can be an alternative to traditional photovoltaic panels mounted on a finished roof covering. In this solution, PV elements are not a separate layer on the roof, but become part of the covering or the building structure. This is particularly interesting for farms that are already planning a larger modernisation: replacing an old roof, rebuilding a barn, renovating a machinery hall or preparing a new farm building.

A solar roof makes the most sense when the current covering is worn, leaking or unsuitable for another PV installation. Instead of ordering a new roof and then adding panels on top of it, an integrated option can be considered. However, this requires a more detailed design, verification of the structure, roof layout, sunlight exposure, costs and actual energy consumption on the farm. Traditional panels will often be the simpler choice if the roof is in good condition and has suitable conditions for installation. However, a solar roof is worth considering when you want to combine roof replacement with new photovoltaics and plan the building for the long term. It is not a solution for every farm, but during a full modernisation it can make the roof a permanent part of the energy production system.

Check out our Energy solutions for farms i Luxembourg.

How does Voltmax help farmers replace old photovoltaics?

Voltmax helps farmers approach the replacement of old photovoltaics as a modernisation of the entire PV system, not just the purchase of new panels. The first step is an inspection of the existing installation: checking production from previous seasons, current energy consumption on the farm and the condition of panels, inverter, wiring, protections and mounting structure. This makes it possible to assess whether the problem lies with the modules themselves, the inverter, connections, monitoring, or simply the fact that the installation no longer meets today’s demand.

On this basis, Voltmax helps select the best scope of work: modernisation of the current system, replacement of panels, replacement of the inverter, expansion of the installation or switching to a solar roof. An important element is also assessing the roof for new photovoltaics, especially on barns, cowsheds, machinery halls, workshops and storage buildings. If the covering is old or technically weak, replacement or preparation of the roof for a new PV installation can be planned.

The entire process also includes safe dismantling of old equipment, collection and responsible handling of used panels, installation of the new system and monitoring configuration. Voltmax also supports farmers with formalities and commissioning of the installation, so that they receive not only new panels, but an efficient, well-organised and properly matched photovoltaic system for their farm in Luxembourg.

The post Replacement of Old Photovoltaic Installations on Farms appeared first on Voltmax Energy Solutions in Luxembourg.

Replacement of old asbestos roofs on farms

Piotr Porębski — Fri, 26 Jun 2026 18:14:28 +0000

Old asbestos roofs on agricultural farms in Luxembourg are not something worth leaving until the last moment. This applies not only to residential houses, but also to barns, cowsheds, garages, shelters, storage buildings, workshops and other farm buildings. For years, such roofing was considered durable and practical. Today, however, it is increasingly becoming an obstacle when renovating, expanding or carrying out an energy modernisation of a farm. Removing asbestos from a roof should not be treated only as a technical problem. It is a good moment to look at the building from a broader perspective: check the condition of the structure, plan the new roofing and decide whether the roof should simply protect the building in the future, or also produce energy. After the old covering has been safely removed, the roof can be prepared for photovoltaics – PV panels can be installed, a solar roof can be considered, and the whole system can be connected to an energy storage system, a heat pump or an EV charger.

For farmers and farm owners in Luxembourg, replacing an old roof can therefore become the beginning of a larger change. On the one hand, it is about safety and handling the asbestos issue in accordance with local rules. On the other hand, it is about using the surface area of farm buildings to reduce energy costs and prepare the farm for the years ahead.

Asbestos roofs on agricultural farms - why are they a problem?

For many years, asbestos was used in roof coverings, including on agricultural and farm buildings. Asbestos-cement sheets were lightweight, durable and resistant to rain, frost and high temperatures, which is why they were often installed on older buildings. Today, the problem is not only the age of such a roof, but above all its condition and the way work is carried out on the building. If the sheets are stable and are not disturbed, the risk is different than in a situation where the roof starts to crack, crumble, leak or needs to be removed during renovation. The greatest risk appears when the material is damaged: during cutting, breaking, drilling, sanding, dismantling, transport or improper storage. At such moments, asbestos fibres may be released. They are invisible to the naked eye, but dangerous to health.

Asbestos on a house, barn, cowshed and farm buildings

Old asbestos-cement roofing may be found in different parts of a farm, not only on the residential house. It is often found on buildings that were built or renovated many years ago, when such sheets were a popular roofing material. That is why, when planning renovation work, it is worth checking not only the main building, but also all other buildings located on the property.

Asbestos may be present, among others, on buildings such as:

the residential house on the farm,
barn,
cowshed,
pigsty,
chicken coop,
garage,
shelter,
machinery hall,
workshop,
feed storage building,
auxiliary buildings.

Each of these buildings may have a different technical roof condition and a different role within the farm. The roof of the house is important above all for the safety of residents and everyday comfort, while the roof of a barn, cowshed or machinery hall may also become a large surface for future photovoltaics. That is why, before replacement, it is worth assessing not only whether the covering contains asbestos, but also whether the new roof should be prepared for PV panels, a solar roof or a broader energy modernisation.

Asbestos in Luxembourg and the EU - what should you know before renovation?

Asbestos has been banned in Luxembourg since 2001. This applies to placing asbestos and asbestos-containing products on the market, as well as their use. However, this does not mean that all older materials automatically disappeared from buildings. Elements installed before the ban may still be present in houses, barns, cowsheds, garages, storage buildings and other farm buildings, which is why the subject returns during renovations, demolitions, roof replacements and energy modernisation. For a farm owner, the most important thing is to check what type of material they are dealing with before any work begins. An old roof may look like an ordinary covering, but during dismantling, cutting, breaking or transport there may be a risk of asbestos fibres being released. That is why removing such a roof should not be treated as a standard roof replacement. It must be planned in accordance with safety rules and local requirements.

What does safe asbestos removal from a roof involve?

Safe asbestos removal from a roof begins with confirming whether the old covering actually contains asbestos, followed by an assessment of the condition of the sheets, the roof structure, access to the building and the possibility of securing the area around the site. On a farm, this is particularly important because the work may take place next to a building that is still used on a daily basis. The dismantling itself is not simply a matter of removing the old covering. With asbestos, it is important to limit dust generation and carry out the work in a way that avoids breaking, crumbling or damaging the sheets. The material should be removed carefully, properly secured, packed and prepared for transport in accordance with local rules. Waste collection and transfer to the appropriate facility are just as important – it should not be stored loosely on the farm.

Why should old asbestos-cement sheets not be removed on your own?

Old asbestos-cement sheets should not be removed on your own, even if they look stable and easy to take down. The main problem is asbestos fibres, which can be released when the material is damaged. They are invisible to the naked eye, but can be dangerous to health, especially when the sheets are cut, broken, sanded, drilled or thrown down from the roof. That is why asbestos-cement sheets should not be treated like ordinary construction waste. They should not be crushed, cut, stored loosely or transported without protection. In Luxembourg, work involving asbestos-containing materials should be carried out by specialist companies in accordance with safety, packaging, transport and waste transfer rules.

Replacing an asbestos roof - a standard roof or a roof prepared for photovoltaics?

After asbestos has been removed, you do not have to limit yourself to installing a new roof covering. This is the moment to decide what role the roof should play over the coming years. It can simply be a watertight and durable protection for the building, but it can also be prepared for a photovoltaic installation, PV panels or a more advanced solution such as a solar roof.

The simplest option is a standard roof covering replacement. This works well when the main goal is to protect the building against leaks and further structural deterioration. Even with this solution, however, it is worth checking the roof load-bearing capacity, roof layout, shading and the possibility of installing panels in the future. This means that the new roof will not close the door to the farm’s energy modernisation. Another option is to plan the roof for photovoltaics from the very beginning. In this case, not only the covering itself matters, but also the structure, cable routes, space for the inverter, protections, energy storage and service access. For farmers in Luxembourg, this can be a particularly practical solution, because large roofs on farm buildings can become surfaces for producing energy for the needs of the farm.

The most advanced option is a solar roof or BIPV, meaning a solution where photovoltaic elements are part of the roof covering or the building structure. This makes the most sense when the roof is being replaced from the ground up and the owner wants to combine renovation with energy production. This option requires a more detailed design, but it allows the roof replacement to be treated as part of a broader farm modernisation.

Solar roof or photovoltaic panels?

After removing asbestos and planning a new roof covering, an important question arises: should you choose a traditional roof with photovoltaic panels or decide on a solar roof from the start? PV panels are usually the simpler option. They are installed on a finished roof covering, which makes them suitable when the roof is in good condition or has just been replaced and has the right load-bearing capacity, roof layout and space for the installation. A solar roof is a more advanced solution. In this case, the photovoltaic elements are not just an addition mounted on top of the covering, but become part of the roof, facade or building structure. This option makes sense when the roof is already being replaced from the ground up, for example after asbestos-cement sheets have been removed.

Check: Photovoltaics for farms

However, it will not always be the best choice for every farm. A solar roof requires a more detailed design, good coordination between roofing and electrical works, and a profitability assessment. Costs, surface area, sunlight exposure, building orientation, future energy consumption and whether the installation is to power the house, farm buildings, heat pump, energy storage system or EV charger all need to be taken into account. For farmers in Luxembourg, the most important question is therefore not simply whether to choose a solar roof or photovoltaic panels, but whether the new covering will be planned as part of a broader farm modernisation.

Photovoltaics for farmers in Luxembourg - why think about them when replacing a roof?

Replacing an old roof is a good moment to think about photovoltaics on a farm. Agricultural buildings often have large roof surfaces that, for years, served only a protective function. After asbestos has been removed and a new covering installed, the same roof can start producing energy for the house, cowshed, barn, machinery hall, workshop or storage building. This is important where the farm uses a lot of electricity during the day. Energy from photovoltaics can power ventilation, pumps, lighting, cold storage, workshop equipment, the office, a heat pump or an EV charger. As a result, the roof not only protects the building, but can also genuinely work for the needs of the farm.

Photovoltaics for farmers in Luxembourg also have the advantage of using existing roof areas without taking up land. The roof of a barn, cowshed, garage or storage building can become a place of energy production, while the farm land remains available for crops, animals, machinery and everyday work. That is why, when replacing an asbestos roof, it is worth checking its orientation, load-bearing capacity, shading and the possibility of installing PV panels in the future right away.

Subsidies and Klimabonus during asbestos roof replacement

Replacing an asbestos roof does not automatically mean eligibility for an energy subsidy. Luxembourg has the Klimabonus programme, which supports, among other things, photovoltaic installations, energy storage systems and heat pumps, but the conditions depend on the type of investment, the building and the devices used. That is why, in the case of an agricultural farm, it is necessary to check separately whether support applies to the residential house, a farm building, the PV installation, battery, heat pump or another element of the modernisation.

A farm often consists of several different buildings: a house, barn, cowshed, machinery hall, garage or storage building. Not all of them will qualify for the same type of support. The situation may be different for photovoltaics on a house, panels on a farm building, and an energy storage system or heat pump used in the residential part.

That is why, before replacing a roof, it is worth treating subsidies as part of planning the entire investment, rather than as something guaranteed. After asbestos has been removed, it is possible to check whether the new roof should be only a covering, or immediately become a surface for photovoltaics, a solar roof or a system connected with energy storage. Voltmax points out that with Klimabonus, specific technical and administrative conditions matter, so it is best to verify in advance which solutions may realistically suit a given building and scope of work.

How does Voltmax help farmers plan the roof and energy system on a farm?

Voltmax helps farmers look at old roof replacement more broadly than just as a single renovation project. For farms in Luxembourg, it is important not only to safely remove the asbestos covering and install a new roof, but also to check whether that roof can immediately become part of a larger energy plan. This applies to residential houses, barns, cowsheds, machinery halls, workshops, storage buildings and other farm buildings.

Work involving asbestos should be carried out in accordance with local safety rules and by properly prepared companies. After this stage, it is possible to plan a new covering, roof insulation, thermal modernisation of the building, photovoltaics, a solar roof, energy storage, a heat pump or an EV charger. Voltmax analyses the condition of buildings, available roof areas, energy consumption on the farm and future needs, and then helps select solutions that will work together. As a result, the farmer does not have to make several separate decisions: one about the roof, another about panels, another about heating and another about energy storage. The whole process can be planned as one farm modernisation project – with lower energy costs, better use of roof surfaces and preparation of buildings for the years ahead in mind. If you are planning to replace an old roof on a farm in Luxembourg, it is worth checking from the start whether the new roof can work not only as a covering, but also as part of the energy system.

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