Are your solar panels profitable?
Move a few sliders and instantly see your estimated production, annual savings and payback time — under 2026 Belgian conditions.
How we calculate
Production
Capacity × average Belgian sunshine, adjusted for the orientation and shading of your roof.
Self-consumption
The share of energy you use directly — much higher with a battery, which shifts usage to the evening.
Profitability
Annual savings against the investment, to estimate the payback time and the net gain over the system’s lifetime.
Solar profitability
Is the calculator reliable? +
It gives a serious order of magnitude based on Belgian averages. The final quote takes your roof, your consumption profile and the chosen equipment into account.
Do I need a battery to be profitable? +
Not necessarily. A battery increases self-consumption and therefore the savings, but adds to the investment. The calculator shows you both scenarios.
Why does exporting earn so little? +
Since the end of the reverse-running meter, exported surplus is paid at a much lower rate than the electricity you buy. Hence the value of consuming your own production.
With a battery, the same family would reach ~70% self-consumption and save nearly 900 €/yr — for a higher investment. The calculator above compares both scenarios.
What the calculation takes into account
- Production: 950 kWh per kWp per year (Belgian average), adjusted for orientation and region
- Electricity bought at 0,35 €/kWh, exported surplus paid at 0,05 €/kWh
- Self-consumption of 35% without a battery, 70% with a battery
- Investment ≈ 1 550 €/kWp (6% VAT included), + 4 800 € for a battery
- Excludes the prosumer tariff and energy price inflation — a quote refines these parameters
Want a precise calculation?
We refine your simulation with a free roof survey and a detailed quote, grants deducted.