Solar panels in Brussels, Flanders and Wallonia

How much does a solar PV system produce in Belgium?

In Belgium, one well-oriented kilowatt-peak (kWp) generally produces between 850 and 950 kWh a year. A 4 kWp system, roughly ten panels, therefore covers a good share of an average household's consumption. South-facing is ideal, but an east-west roof is still worthwhile: it produces slightly less overall, but spreads output more evenly between morning and late afternoon.

Getting the size right is not just about covering the whole roof. It depends on your annual consumption, your plans (an electric car, a heat pump) and how much of the output you can use yourself. That is exactly what the adviser checks with you before requesting quotes.

Brussels, Flanders and Wallonia: different rules

In Brussels, solar PV systems earn green certificates for 10 years, based on production. For systems commissioned since 1 April 2026, Brugel has lowered the award rates above 5 kWp, while rates remain unchanged for residential systems up to 5 kWp. The certificates can be sold and shorten the payback period. In Wallonia, new systems commissioned since 2024 no longer benefit from net metering (the meter running backwards) or green certificates, and they do not pay the prosumer tariff either.

In Flanders, new systems have not had a meter running backwards since 2021: a digital meter records consumption and injection separately, and grid costs are largely based on the capacity tariff, calculated on your monthly peak demand. In both Flanders and Wallonia, you pay for the electricity you take from the grid and your supplier pays you for what you feed in, which makes self-consumption the key to profitability.

Use your own power to make it pay

Because the electricity you feed into the grid is bought back at a much lower price than the electricity you buy, profitability depends mainly on self-consumption. Running the washing machine, dishwasher or water heater during the day, charging an electric car at midday or pairing the system with a heat pump lets you use a larger share of your output directly.

A home battery can complete the set-up by storing daytime surplus for the evening. It is not always cost-effective: it all depends on your consumption profile. The adviser helps you assess whether it makes sense in your case, now or later. It can be added afterwards if the inverter is compatible.

A certified installer and a compliant installation

Choose an installer with RESCert PV certification, which is also required for many regional schemes. Before commissioning, the installation is inspected by an approved body under the RGIE/AREI electrical regulations, then registered with the grid operator (Sibelga in Brussels, Fluvius in Flanders, ORES or RESA in Wallonia). In Brussels, Brugel certification is also required to receive green certificates.

RhinoEnergy only puts you in touch with certified installers in your area. You receive up to 3 comparable quotes, detailing the equipment, installation and warranties, so you can choose with full knowledge and no obligation. The adviser also helps you read these quotes: actual output, panel and inverter quality, production warranties and commissioning lead times.