« Ajout d'une batterie à notre installation solaire existante. Le dimensionnement était juste, on consomme désormais le soir notre propre énergie. »
Claire D.Wavre
Service · installer
Home battery installer
Store your solar electricity and use it in the evening instead of feeding it back to the grid at a low price. Our certified installers fit your LFP lithium battery — new or as a complement to existing panels — with a compliant connection and supervised commissioning.
LFP lithium safe and long-lasting chemistry
Self-consumption ~70% instead of ~35% without a battery
Certified fitting compliant connection
Certified installerWallonia & Brussels
10-year warrantyon the LFP battery
What we take care of
From study to supervision, everything is covered
A well-fitted battery starts with proper sizing and a flawless connection. Here are the six areas we handle on every project.
Sizing study
Analysis of your consumption, your solar production and your habits to choose the useful capacity (5 to 10 kWh) — neither oversized nor too tight.
Inverter compatibility
Check of your existing inverter and choice between an AC- or DC-coupled, hybrid or all-in-one battery, for a coherent and high-performing setup.
Fitting & connection
Wall or floor mounting, power cabling, connection to the electrical panel and to the inverter, in compliance with the RGIE and the grid operator’s rules.
Safety & protections
Choice of the room, ventilation, safety distances, electrical protections and emergency cut-off: an LFP lithium installation fitted to last without risk.
Commissioning & supervision
Setting of the charge/discharge thresholds, commissioning and activation of monitoring: you see in real time what the battery stores and releases.
Adding to an existing installation
Already have panels? We graft a battery onto your solar installation without replacing everything, reusing the existing setup as much as possible.
How it works
Four steps, from study to follow-up
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Study
We analyse your consumption profile, your solar production and your inverter to target the right storage capacity.
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Quote
You receive a clear quote: capacity, LFP equipment, connection and commissioning, with detailed 6% VAT for renovation.
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Installation
Our installers fit the battery, carry out the compliant connection and secure the room in a single intervention.
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Commissioning & follow-up
Setting, charge/discharge tests, activation of supervision and explanation of how it works. We stay reachable afterwards.
~70% self-consumption with a battery
5–10 kWh capacity of a home battery
6% VAT for renovation (+10 years)
10 years warranty on the LFP battery
New or as a complement?
New battery or addition to existing panels
Two scenarios, the same demand for quality. Whether you start from scratch or equip a solar installation already in place, we adapt the equipment and the connection to your situation.
- New battery: sized with your panels for an optimised setup from the start
- Addition to existing PV: we reuse your inverter when possible, otherwise a hybrid inverter
- In both cases: compliant connection, supervision and 10-year warranty on the battery
Photo — LFP home battery connected to a hybrid inverter and an electrical panel
Are you feeding your solar power back at a low price?
A battery stores that surplus for the evening and boosts your self-consumption. Let’s do the calculation together.
Frequently asked questions
Home battery installation
Which battery capacity should I choose?
For a home in Wallonia or Brussels equipped with solar panels, a battery of 5 to 10 kWh covers most evening and night-time needs. The right sizing depends on your consumption, your production and your habits: our study tells you the useful capacity, without oversizing unnecessarily.
Is the battery compatible with my inverter?
Often yes. Depending on your existing inverter, we couple the battery on AC (without replacing the solar inverter) or switch to a hybrid inverter that manages panels and battery together. We check compatibility right from the study to offer you the most economical solution.
Is a home battery worth it?
A battery raises your self-consumption from about 35% to nearly 70%: you buy less electricity from the grid and feed back less surplus at a low price. Generally count between €4,000 and €7,000 depending on capacity (5 to 10 kWh), with 6% VAT for renovation. Our profitability simulator calculates your specific case.
What warranties and what safety?
We install LFP lithium batteries (LiFePO₄), a chemistry renowned for its stability and longevity, with a manufacturer’s warranty of around 10 years. The fitting complies with the RGIE: suitable room, ventilation, electrical protections and emergency cut-off. An installation designed to last in complete safety.
Indicative prices
How much does a home battery cost?
2026 ranges — equipment fitted, 6% VAT for renovation, confirmed after the study
| Service | Range | Typical lead time |
|---|---|---|
| LFP battery 5 kWh (fitted) | 4 000 – 5 000 € | By appointment |
| LFP battery 7 kWh (fitted) | 5 000 – 6 000 € | By appointment |
| LFP battery 10 kWh (fitted) | 6 000 – 7 000 € | By appointment |
| Hybrid inverter (if needed) | on quote | Depending on installation |
| Addition to an existing solar installation | on quote | After study |
For renovation (home over 10 years old), 6% VAT applies to labour and equipment. The final price depends on the capacity chosen and on your existing inverter.
Go further
Battery & solar — going further
Customer reviews
They chose wendows
5.0/5 · 1verified reviews
A home battery project?
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