« Devis clair, sans surprise, primes comprises. Un seul interlocuteur du début à la fin. Je recommande sans hésiter pour le photovoltaïque. »
Pierre M.Tournai
Service · installation
Installation of solar panels
From the survey of your roof to commissioning, we handle your entire photovoltaic installation. Precise sizing, careful mounting, compliant grid connection and production monitoring: you track your savings from day one.
RESCert certified teams
from 950 kWh/kWp/year estimated output
6% VAT on renovation
RESCert certifiedcompliant mounting & connection
Monitoring includedproduction tracked in real time
What we take care of
A turnkey photovoltaic installation
A good installation cannot be improvised: every step, from the roof survey to the grid connection, determines the yield and profitability of your project over 25 years.
Roof survey & layout
Analysis of orientation, tilt, shading and structure. Module layout to make the most of the available surface.
Sizing in kWp
Calculation of the ideal capacity based on your consumption and your roof. Neither oversized nor too tight: a well-calibrated kWp means optimised profitability.
Module & inverter mounting
Fixing of the rails and panels, mounting of the inverter and optimisers if needed. Careful work, watertightness preserved, wiring protected.
Connection & meter
Electrical connection compliant with RGIE standards and link to the meter. We handle the declaration to the grid operator for your installation.
Commissioning & monitoring
Full test of the installation, start-up and configuration of the monitoring: you track your production and self-consumption day to day.
Prosumer guidance & paperwork
Prosumer tariff in Wallonia, certificates, compliance certification: we guide you through all the administrative steps.
How it works
From survey to commissioning
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Survey & visit
Analysis of your roof and your consumption. We check the orientation, shading and structure to confirm feasibility.
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Quote & sizing
A costed proposal with the capacity in kWp, the estimated output and the return on investment. Everything is clear, with no surprises.
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Installation
Mounting of the modules, inverter and wiring by a RESCert-certified team. A clean job, usually completed in one to two days.
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Commissioning & production tracking
Grid connection, start-up and configuration of the monitoring. You track your production and we remain available for maintenance.
≈ 1 550 €/kWp installed, 6% VAT included
950 kWh/kWp of output per year in Belgium
~35% self-consumption, 70% with a battery
RESCert certified teams
Self-consumption
With or without a battery?
Without a battery, you self-consume around 35% of your production: the rest goes to the grid, subject to the prosumer tariff in Wallonia. With a battery, you reach up to 70% self-consumption by storing the daytime surplus for the evening.
- Without a battery: ~35% self-consumption, surplus fed into the grid
- With a battery: up to 70% self-consumption, evenings covered
- Simulate your profitability based on your consumption profile
Photo — inverter and home battery installed in a utility room
Is your roof suited to solar?
A free survey is enough to find out: orientation, surface area, estimated output and budget, with no commitment.
Frequently asked questions
Solar panel installation
How many panels do I need for my home?
It depends on your consumption and your roof. A typical 4 kWp installation has around 9 to 10 panels and produces nearly 3,800 kWh per year, which covers a good share of the consumption of an average household. Our survey calculates the exact capacity suited to your profile.
How long does the installation take?
For a standard residential installation, the work usually takes one to two days: fixing the modules, mounting the inverter, wiring and connection. Commissioning follows once the checks have been carried out.
Are your teams certified and is the installation guaranteed?
Yes. Our installers are RESCert certified, a recognised mark of quality in Belgium. The panels come with a 25-year production warranty depending on the manufacturer, and the inverter with a manufacturer warranty. The mounting and connection comply with RGIE standards.
Is photovoltaic still profitable in 2026?
Yes. With a cost of around €1,550/kWp installed (6% VAT) and an output of 950 kWh/kWp per year, the return on investment remains attractive, especially in self-consumption. A battery increases the self-consumed share and speeds up profitability. Our simulator works out your specific case.
Indicative pricing
How much does an installation cost?
2026 ranges — turnkey, 6% VAT included, confirmed after the roof survey
| Service | Range | Typical lead time |
|---|---|---|
| 3 kWp installation (~7 panels) | 4 500 – 5 200 € | 1 day of mounting |
| 4 kWp installation (~9 panels) | 5 800 – 6 600 € | 1 – 2 days of mounting |
| 6 kWp installation (~14 panels) | 8 500 – 9 800 € | 2 days of mounting |
| Hybrid inverter (battery option) | from 1 200 € | On survey |
| Power optimisers | on quote | Depending on shading |
On renovation (home over 10 years old), 6% VAT applies to the supply and the mounting. Allow around 1 550 €/kWp installed for a standard installation.
Coverage
Our service areas
LiègeNamurCharleroiMonsBrusselsWavreVerviersHuyWaterlooLa LouvièreTournaiGemblouxNivellesMarche-en-Famenne
Your municipality isn’t listed? See all our areas.
Go further
Solar panels — go further
Customer reviews
They chose wendows
5.0/5 · 1verified reviews
A photovoltaic project to launch?
Tell us your roof type and your consumption: we offer you a free survey, precise sizing and a clear quote, with no commitment.
Reply within 24 working hours No obligation Grants & 6% VAT handled