This page was written by
Nicolas Nihon
Co-founder of Vectura
Professionals
Photovoltaic panels
Adding photovoltaic panels to an existing installation in Wallonia: everything you need to know in 2025
Do you already own photovoltaic panels in Wallonia and are considering adding new modules to increase energy production? As of January 1, 2024, new rules apply to pre-existing photovoltaic installations. Although the compensation scheme is still in force for certain installations, it's important to understand the conditions that must be met to maintain it. This article explains how to add photovoltaic panels while maintaining your current benefits, as well as the technical points to watch out for.
Request a quoteWhy add solar panels in Belgium?
Adding solar panels in Belgium offers many advantages for both individuals and businesses. With rising energy costs and the transition to renewable energy sources, adding a photovoltaic panel in Belgium is an effective solution for reducing your electricity bills and contributing to a greener future.
By opting for a solar panel extension, you can increase the production capacity of your existing installation, while taking advantage of new technologies that improve yield. Whether to maximize self-consumption or to keep pace with changing energy needs, such as the addition of electric vehicles or environmentally-friendly heating systems, photovoltaic installation in Belgium is becoming a necessity.
What’s more, Belgian regulations and the various financial incentives available make this approach even more attractive, enabling you to recoup part of your investment through bonuses or tax deductions. Whether you’re planning toadd photovoltaic panels to your existing installation, or to install your first photovoltaic system in Belgium, you’ll benefit from both savings and added value for your property.
Contact usWhen should photovoltaic panels be added to an existing installation?
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Evolution of your energy needs
If you've got into the habit of maximizing self-consumption to reduce your bills, and your needs have increased (growing family, new consumption habits), adding panels will meet your energy demands.
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Acquisition of new electrical equipment
Installing new energy-hungry appliances, such as a heat pump or an electric vehicle charging station, requires more electricity. Adding panels will cover these additional needs.
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Optimize the resale of your surplus electricity
Adding photovoltaic panels represents an investment strategy to increase electricity production and generate additional income by selling your surplus to the grid.
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How do I add photovoltaic panels to an existing installation?
Adding photovoltaic panels to an existing installation is an effective way of increasing your renewable energy production and optimizing your electricity savings. Before taking this step, it’s important to check the capacity of your current inverter, as it must be able to support theaddition of new panels. If necessary, a replacement or upgrade may be required. It’s also essential to assess the condition of the roof and the space available for the new modules. Calling on a certified installer such as Vectura guarantees you an extension that complies with safety standards, as well as optimal integration with your existing system.
What are the advantages of adding photovoltaic panels to an existing installation?
Adding photovoltaic panels to an existing installation offers several advantages:
- Optimize self-consumption: produce more energy to cover your new needs, reducing your electricity bills.
- Long-term savings: The extension increases savings by up to 30%, while reducing your energy costs.
- Property value: A more efficient installation increases the value of your property.
- Access to financial aid: Take advantage of the grants and subsidies available in Belgium to reduce your initial investment.
- Environmental impact: Increase your contribution to the reduction of CO2 emissions and the use of clean energy.
Get a quote for a photovoltaic extension and maximize your green energy production
How do we improve the yield of photovoltaic panels?
I would like to make an appointment
01Audit your installations
An expert will carry out a detailed analysis of the site to determine the possibilities without causing you to lose the compensation system if your installation was approved before 31/12/2023. If your system was approved after this date, the added power may exceed 1 kW.
02Submitting a proposal
Once the needs and restrictions of the site have been assessed, the expert presents various options for adding new panels, either on the same slope or on other areas of the roof. The inverter could also be replaced, depending on the needs and specifics of your installation.
03Installation on schedule
Once all the formalities have been completed, the new panels can be added. The certified installer will ensure that the installation runs smoothly and in compliance with safety standards.
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Why choose Vectura?
We are experts in installing charging stations, photovoltaic panels and storage batteries. Thanks to our recognised expertise, we offer customised, reliable solutions that comply with the most stringent standards. By choosing us, you are opting for a sustainable, economical energy transition supported by a team committed to your satisfaction.
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Experienced staff
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Fast intervention
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Quality products
Frequently asked questions about adding panels to an existing installation
Find answers to frequently asked questions about boosting your solar output
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Do I have to replace my inverter to add panels?
This depends on the current capacity of your inverter. In some cases, we recommend replacing it with a hybrid inverter.
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What are the advantages of photovoltaic panels?
Photovoltaic panels offer many advantages: clean, renewable energy production, lower electricity bills, added value for your property, partial energy independence, etc.
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Is my inverter compatible with the addition of new panels?
Vectura checks the capacity of your current inverter and, if necessary, proposes solutions to support the addition of new panels.
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What financial assistance is available for adding panels in Belgium?
Vectura can help you obtain regional incentives and tax benefits for adding photovoltaic panels.
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How much does it cost to install photovoltaic panels in Belgium?
The cost varies according to the size of the extension and the equipment required. Vectura can provide you with a personalized estimate.
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What is the compensation plan?
In Wallonia, the compensation scheme is a mechanism that allows owners of photovoltaic panels to deduct the energy fed into the grid from the energy consumed. In other words, your meter “turns upside down” when you produce more electricity than you consume. This system remains valid for photovoltaic installations completed before 2024, provided certain criteria are met, even if you add panels after this date. For all photovoltaic systems installed after January 1, 2024, the compensation system has been discontinued by the Walloon authorities, which in no way reduces the profitability of a photovoltaic system.
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Do you need to add batteries to your existing photovoltaic system?
Adding batteries is becoming increasingly relevant. With a hybrid inverter and batteries, you can store excess energy and use it when you need it, further reducing your dependence on the grid.
Can I add photovoltaic panels?
It’s perfectly possible toadd photovoltaic panels to an existing installation. This option is ideal if your energy needs have changed, or if you want to maximize your self-consumption. Before proceeding, here are a few things to consider:
Installation compatibility
Your current inverter and electrical system must be able to support the addition of new panels. An audit of your installation by a professional is recommended to ensure technical compatibility.
Available space
Make sure your roof or plot has enough space to accommodate new panels without compromising their efficiency.
Financial aid
In Belgium, there are various grants and subsidies for solar panel extensions, which can reduce your initial investment.
If these criteria are met, adding photovoltaic panels is a cost-effective and environmentally-friendly way to increase your energy production.
How to increase photovoltaic production?
If you want to maximize the output of your photovoltaic system, there are a number of solutions available. Here are the main methods for increasing photovoltaic output efficiently and cost-effectively:
1. Add photovoltaic panels
One of the most common options for increasing production is toadd photovoltaic panels to your existing installation. This allows you to increase your energy production capacity in line with your growing energy needs. Before proceeding, it’s important to check the compatibility of your inverter and the space available on your roof.
2. Replace or optimize inverter
The inverter is a key component of your photovoltaic system. If your inverter is undersized or obsolete, it could limit the production capacity of your panels. Replacing the inverter with a higher-capacity or more efficient model can significantly improve the yield of your photovoltaic panels.
3. Optimize panel orientation and inclination
To maximize production, your panels need to be ideally oriented and tilted. Optimizing the orientation or tilt of existing panels can improve their exposure to the sun and increase their energy production. If you’re planning toadd panels, it’s advisable to choose the location with the best solar exposure.
4. Install an energy storage system
Adding storage batteries allows you to store the excess energy produced by your photovoltaic panels. This allows you to use this energy during periods when the panels are not producing (night or cloudy days), increasing your self-consumption and further reducing your dependence on the electricity grid.
5. Regular panel cleaning and maintenance
Photovoltaic panels need regular maintenance to ensure optimum production. Dust, leaves and other debris can reduce the efficiency of your panels. Periodic cleaning and maintenance will increase the performance of your panels and extend their lifespan.
By combining several of these solutions, you can considerably increase the photovoltaic output of your existing installation and maximize your return on investment. Talk to one of our experts to assess your options and get a quote tailored to your needs.
