Introduction
In 2026, solar energy is a pillar of the energy transition in Belgium, especially for single-family homes. With rising electricity prices and EU climate goals, more owners choose solar panels to cut bills and CO2 emissions. But how many panels for a 100m² house? This question is key for proper sizing. In this article, we explore factors, calculations, subsidies, and more.
Belgium benefits from average 1,500 sunshine hours per year, making installations profitable. Per APERe, over 500,000 households adopted solar in 2025. For 100m², consumption is 3,500 kWh/year.
This article is based on 2026 data. Use our calculator for estimate, and request a quote.
The choice is not just about quantity, but quality. In Belgium, prosumers benefit from mechanisms like injection tariffs in 2026.
Factors Influencing the Number of Solar Panels
Various elements determine the number. First, annual consumption: 2,500-5,000 kWh depending on insulation. Orientation: South roof maximizes, 1,100 kWh/kWc.
Power: 400-500 Wc in 2026. Batteries optimize. Habits: EVs double needs.
List:
- Consumption
- Location
- Type
Personal calculation essential.
Calculation for a 100m² House
For 3,500 kWh, 3.5 kWc needed. With 400 Wc panels, 9-12. Table:
| Region | Panels |
|---|---|
| Wallonia | 10 |
Integrate batteries for reduction.
Steps: Estimate, Calculate.
Subsidies in Belgium for 2026
Wallonia: €1,500 premium. Flanders: €750/kWc. List:
- Wallonia
- Flanders
Aids total €2,000.
Costs and Profitability
€8,000-12,000 for 10 panels. ROI 6-8 years. Table:
| Component | Cost |
|---|---|
| Panels | 3,000 |
Savings €1,200/year.
Installation and Maintenance
1-2 days. Maintenance: Annual cleaning. List:
- Cleaning
- Monitoring
Conclusion
8-12 panels for 100m². Use calculator and quote.
