about joule
joule inspires change and aspires innovation
joule is an owner-managed, medium-sized company based in Luxembourg. joule’s range of services includes:
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Consulting
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Fast Online Simulation of your PV system
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Home Assessment
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3D Roof Measuring with drones
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3D Simulation for PV systems
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Amortization calculation
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Authorization requests preparation
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Installation and Initial Operation
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Maintenance and Repair
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Cleaning of PV systems
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E-mobility
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Integration of E-Mobility with PV
joule is dedicated to leading the charge in the green energy revolution, focusing on sustainable investments that foster innovation and contribute to a cleaner, more efficient future.
joule has a suitable solution for you.
Whether you are a tenant, a flat owner, or the owner of a house or other property, joule provides tailored solutions for every living situation.
Tenant
Even if you don’t own property, you can benefit from the energy transition too. For example, a balcony power plant can generate enough electricity to cover a significant portion of your household appliances and lighting needs.
Owner
Your house, flat, or even unused building or plot of land offers numerous opportunities for self-consumption, as well as the potential to sell excess electricity back to your energy supplier
Co-owner
As a co-owner, you can achieve a lot by collaborating with like-minded individuals. Sustainability is becoming increasingly important to many people—why not start the conversation with your neighbours?
about our services & products
what can joule do for you?
Mini solar plant
Fits on balconies, flat roofs, carports or lown areas.
Each solar module produces 400W, while the lightweight version produces 200W. A maximum of 2 standard solar panels or 4 lightweight modules can be installed, offering a total output of 800W (which corresponds to the power usage of several common household appliances.)
joule provides the complete PV system:
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Solar Panels
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Inverter
(What converts the solar energy into energy you can use)
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Wi-Fi Antenna
(In order to connect with the mobile app)
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Production Control App
(So you can monitor the performance of your solar panel)
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Optional Wi-Fi-Repeater
(If it is too far from your router)
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10 year product warranty
Our service includes on-site installation for immediate use.
Good to know
Your benefits:
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Increased energy independence
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Electricity bill reduction
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Active contribution to the energy transition and climate protection
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Fast amortisation in 3 to 5 years
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Up to 50% investment subsidy
(Klima-Bonus), plus possible subsidy from your municipality)
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Systems of 800W
do not require authorization or registration with your grid operator
Compared to a Classic solar plant:
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Any overproduction
can be fed into the grid, but without financial compensation.
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Maximum of 800 watts
per residential unit
What are my next steps?
Verify with your municipality if a building permit is required and obtain it if necessary.
Order your system directly from joule or via Letzshop .
joule delivers and installs the system.
joule prepares all necessary documents to help you apply for investment subsidy(ies) quickly and easily.
Classic solar plant (Mostly self-consumption)
Fits on roofs, lawn areas or any flat area.
The most common installation for this type of system is on a roof, whether it’s your home or an outbuilding like a barn. As a single-family homeowner, you can set up the system for your own use. If you co-own a property, you can collaborate with other owners to plan a collective self-consumption installation.
joule provides the complete PV system:
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Solar Panels
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Inverter
(What converts the solar energy into energy you can use)
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Battery Storage System
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Wi-Fi Antenna or optional 4G antenna with SIM card
(if Wi-Fi is unavailable)
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Production Control App
(So you can monitor the performance of your solar panel)
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Optional Wi-Fi-Repeater
(If it is too far from your router)
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10 year product warranty
Our service includes on-site installation for immediate use.
Good to know
Your benefits:
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Increased energy independence
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Electricity bill reduction
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Option to feed excess energy into the grid for compensation
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Fast Amortisation in less than 5 years
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Active contribution to the energy transition and climate protection
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Increased property value
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Up to 50% investment subsidy
(Klima-Bonus), ) (max. 1562,50€ per kWp for systems under 30kWp), plus possible subsidy from your municipality
Compared to a Value solar plant:
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Lower feed-in tariff for overproduction
you need a purchase agreement with an electricity supplier and are subject to their tariff policies
What does it cost me?
The photovoltaic market is complex and constantly evolving, with numerous models and formats available. To help you navigate this landscape, joule offers a free simulation with our calculation tool that provides a detailed assessment of your roof’s potential.
This tool estimates energy output, cost savings, and environmental impact in terms of CO2 reduction and an estimation of the installation cost. After using the simulation tool, you can book a site visit for a binding offer that includes all technical details for the recommended system.
What are my next steps?
Determine the potential of your roof by using our solar roof simulator.
Contact us to book a visit.
joule visits your property for a 3D measuring with a drone and assess the technical conditions.
joule prepares an offer within a maximum of 2 weeks after the site visit.
By signing the offer you place the order.
joule prepares all the necessary documents so that you can request authorisation from the grid operator and your municipality.
If requested, joule can coordinate the feed-in tariffs with the electricity supplier and prepare feed-in contracts.
joule delivers and installs the system.
joul takes care of commissioning the system in coordination with the grid operator.
joule prepares all necessary documents to help you apply for investment subsidy(ies) quickly and easily.
If requested, joule can do a yearly maintenance on the installation.
joule can repair any issues that arise to ensure its optimal performance and longevity.
Value solar plant (100% feed in)
Fits on roofs, lawn areas or any flat area.
This type of installation is particularly advantageous for unused buildings or plots of land. It allows the owner(s) to generate income, increase the property’s value, and contribute to the energy transition all at the same time.
joule provides the complete PV system, including on-site installation and initial operation.
joule provides the complete PV system:
-
Solar Panels
-
Inverter
(What converts the solar energy into energy you can use)
-
Battery Storage System
-
Wi-Fi Antenna or optional 4G antenna with SIM card
(if Wi-Fi is unavailable)
-
Production Control App
(So you can monitor the performance of your solar panel)
-
Optional Wi-Fi-Repeater
Optional Wi-Fi-Repeater
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10 year product warranty
Our service includes on-site installation & initial operation.
Good to know
Good points:
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Feed-in of your solar energy production
into the grid with a guaranteed feed-in tariff for 15 years (Grand-Ducal regulation of 12 April 2019). Alternatively, you can negotiate a purchase agreement with an electricity supplier that offers a flexible feed-in tariff and contract duration.
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Amortisation of the system in less than 5 years
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Active contribution to the energy transition and climate protection
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Increased property value
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20% and max. 500€ per kWp investment subsidy
(Klima-Bonus) ) for installations under 30kWp, plus possible subsidy from your municipality
Compared to a Value solar plant:
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You cannot consume the energy you produce.
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The investment subsidy is smaller
(20% compared to 50%)
What does it cost me?
The photovoltaic market is complex and constantly evolving, with numerous models and formats available. To help you navigate this landscape, joule offers a free simulation with our calculation tool that provides a detailed assessment of your roof’s potential.
This tool estimates energy output, cost savings, and environmental impact in terms of CO2 reduction and an estimation of the installation cost. After using the simulation tool, you can book a site visit for a binding offer that includes all technical details for the recommended system.
What are my next steps?
Determine the potential of your roof by using our instant simulator.
Contact us to book a site visit.
joule visits your property for a 3D measuring with a drone and assess the technical conditions.
joule prepares an offer within a maximum of 2 weeks after the site visit.
By signing the offer you place the order.
joule prepares all the necessary documents so that you can request authorisation from the grid operator and your municipality.
If requested, joule can coordinate the feed-in tariffs with the electricity supplier and prepare feed-in contracts.
joule delivers and installs the system.
joule takes care of commissioning the system in coordination with the grid operator.
joule prepares all necessary documents to help you apply for investment subsidy(ies) quickly and easily.
If requested, joule can do a yearly maintenance on the installation.
joule can repair any issues that arise to ensure its optimal performance and longevity.
Charging station for e-cars
You can charge your electric vehicle either at a permanently installed wall charging station or occasionally using a standard socket. For reasons of convenience and safety, we advise you to install a wall charging station.
A wall charging station is a powerful charging solution that significantly reduces charging time. It allows you to charge your electric car safely and efficiently at home, as conventional household sockets are not designed to handle the continuous load of charging an electric vehicle.
Since every home has different requirements, we will assess on a site visit how your wall charging station can be installed for optimal performance.
Wall charging station AMTRON® 4You 100 installation includes:
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11 kW charging power
(the average power, it can add 50-70km per hour of charging depending on the vehicle)
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Easy cable management
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LED status indicator
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Replaceable covers in the colors of choice
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Made in Germany
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Investment subsidy Klima-Bonus: 750€
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2year product warranty
Our service includes on-site installation & initial operation.
What are my next steps?
Contact joule to schedule an appointment.
joule visits your property your property to assess the technical conditions.
joule prepares an offer within a maximum of 2 weeks after the site visit.
By signing the offer you place the order.
joule prepares all the necessary documents so that you can request authorisation from the grid operator.
joule delivers and installs the charging station.
joule takes care of commissioning the charging station in coordination with the grid operator.
joule prepares all necessary documents to help you apply for investment subsidy(ies) quickly and easily.
Smart charging station for e-cars
If you arelooking to purchase a wall charging station for your electric vehicle and already have, or are planning to install, a photovoltaic system? With our intelligent wall charging station, you can utilize your self-generated electricity to either power your vehicle or feed it back into the grid.
The smart wall charging station detects when there is a surplus of electricity from your solar modules and uses this excess energy to charge your vehicle.
Since every home has different requirements, we will assess on a site visit how your wall charging station can be installed for optimal performance.
Smart wall charging station AMTRON® 4You 300 installation includes:
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11 kW charging power
(the average power, it can add 50-70km per hour of charging depending on the vehicle)
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Easy cable management
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LED status indicator
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Replaceable covers in the colors of choice
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Made in Germany
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Investment subsidy Klima-Bonus: 1.200€
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2year product warranty
Smart wall charging station AMTRON® 4You 500:
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Optional RFID access control to prevent unauthorized use
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Optional App for managing functions such as starting, stopping, and monitoring the charge
Our service includes on-site installation & initial operation.
What are my next steps?
Contact joule to schedule an appointment.
joule visits your property to assess the technical conditions.
joule prepares an offer within a maximum of 2 weeks after the site visit.
By signing the offer you place the order.
joule prepares all the necessary documents so that you can request authorisation from the grid operator.
joule delivers and installs the charging station.
joule takes care of commissioning the charging station in coordination with the grid operator.
joule prepares all necessary documents to help you apply for investment subsidy(ies) quickly and easily.
Case study
The sun shines for you!
Solar Roof Simulator
Get an estimation of your roof's potential.
Quickly check and discover the benefits of joule's photovoltaic solutions with the help of our simulation and calculation tool.
Single family house
Solar panels
2024
- 24 pannels (420Wp/pannel) =10,56kWp
- Inclination 10°
- Panel orientation 209°
- Self-consumption : 32% 32% of the energy produced is used for personal consumption, the rest is fed-into the grid against financial compensation
- Self-sufficiency*: 87% 13% of the energy consumed still needs to be purchased from the grid because the consumption happens when the battery is empty and the sun isn t shining enough yet/anymore –early morning and late in the evening
- Yearly CO2 reduction: 4.519 kg
- Is equivalent to a – car ride of 22.595km – a reduction of your carbon footprint of 39% – the amount of CO2 yearly absorbed by 362 trees
Roof
Flat
E-car
No
Annual consumption
3.494 kWh
Heating & Hot water
Fuel
Battery storage
10,5 kWh
questions
Frequently asked questions
Is Joule a Luxembourgish company?
Does Joule only operate in Luxembourg?
What does kWp mean?
Who is my grid operator?
In Luxembourg it rains a lot. Does a PV-installation make any sense?
How about maintenance?
What happens if my installation has a problem? Can I be without electricity?
My name is Marc Wagener, and I am an electrical engineer. I founded joule to help all types of households contribute to a sustainable future. My goal is to provide both home owners and tenants with the opportunity to invest in solar energy.
With over 20 years of experience as Manager and Managing Director in different industries (energy), as well as in the construction, renovation and management of properties in Luxembourg and abroad, I have gained extensive knowledge in energy efficiency and building sustainability. I am eager to share this expertise with you, both now and in the future.
I look forward to building a sustainable future together with the joule team and our customers.
joule is an owner-managed, medium-sized service company based in Luxembourg dedicated to helping electricity consumers participate in the energy transition. Whether you are a tenant, a flat owner, co-, or the owner of a house or other property, joule provides tailored solutions for every living situation. With joule’s expert advice and support, you can make a meaningful impact on the environment while also lowering your energy costs. joule is committed to making sustainable energy accessible to all.
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