Solar panels on your roof: Is it still interesting?
Sure! Solar panels remain an attractive investment for many households. Let's take a look at the numbers.
The calculation:
1. Principles
- You have 10 solar panels of 400 Wp each (which stands for watt peak). The total cost is approximately €5000.
- The total yield of these panels is 3000 kWh per year (75% of 4000 Wp).
- You use 33% of this generated power directly yourself and return 66% to the electricity grid.
2. With Netting
- Personal use: 33% x 3000 kWh x €0.30 = €300 per year.
- Return with netting: 66% x 3000 kWh x €0.30 = €600 per year.
- Total: €900 per year, which represents a return of 18%. The payback period is then 5 years and 7 months.
Other options.
3. With Netting and Feedback Costs
- Feedback fee: €0.10 per kWh.
- Personal use: €300 per year.
- Return with compensation: 66% x 3000 kWh x (€0.30 - €0.10) = €400 per year.
- Total: €700 per year, with a return of 14%. The payback period is then 7 years and 2 months.
4. Without Netting
- Personal use: 33% x 3000 kWh x €0.30 = €300 per year.
- Return: 66% x 3000 kWh x €0.00 = €0 per year.
- Total: €300 per year, which still provides a return of 6%. The payback period is then 16 years.
5. Increase personal use:
- Without netting, you can strongly influence the return by increasing your own usage. For example, by using more devices during the day when the sun is shining.
- Please note: without netting, you will receive a market rate for return, which may fluctuate. In practice, the payback period will therefore be shorter than the 16 years mentioned.
In short, solar panels are still a smart investment, especially if you're optimizing your own power consumption.
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