Three parameters influence the profitability of your installation:
1. Price per Watt-Peak
Himself influenced by:
- The size of your plant: the rule is simple, the larger the plant, the greater the economies of scale. There are many fixed costs associated with installation (workers' travel, inverter, rental of a gondola, etc.). An installation with more panels will therefore be cheaper per Watt Crete installed, and therefore more profitable.
- Panel type
- Inverter type
- The distance between the inverter and the panels: if the panels are placed outside your home (e.g. a ground structure in the back of the garden), trenching work will have to be taken into account. And the greater the cable distance, the greater the cable diameter. This increases the price per Watt-peak.
2. The orientation and inclination of the panels, as well as their geographical location.
A south-facing panel produces more than an east- or west-facing panel. It makes perfect sense. Depending on the orientation and inclination of a panel, a 'producible' can be determined. Productivity is the number of kWh produced per kWp installed. In Brussels, this can vary from +/-1,050 kWh/kWp for an optimal situation at 30° South, to 850 kWh/kWp for a situation at 30° East-West. A loss of only 20% in the worst case.
3. The region
This is the most important criterion, along with the size of the installation. In fact, the region in which you carry out your project has a direct influence on the grants you receive.
- Brussels: 3 to 6 years return on investment and 12 to 25% annual financial return
- Wallonia: 5 to 10 years' return on investment and 10 to 20% annual financial return.
- Flanders: 7 to 10 years' return on investment and 7 to 15% annual financial yield.
