Rising electricity prices and climate protection. There are good reasons to think about building a photovoltaic roof system. "If the operator manages to consume enough of the electricity generated himself, then the investment pays off," says Nils Seidel, photovoltaic (PV) expert at the North Rhine-Westphalia Chamber of Agriculture. However, the construction of a pure feed-in system is currently not generally worthwhile.
Example of EEG funding
An example (see overview 1): Suppose a PV system with an installed capacity of 50 kWp and an annual electricity yield of 47,000 kWh was put into operation in January 2022. The EEG remuneration, i.e. the feed-in remuneration set for 20 years under the Renewable Energy Sources Act (EEG), is then 6.38 cents per kWh of electricity fed in. With full feed-in, this adds up to a yield of €61,235.
However, since the costs for the system (980 €/kWp, full financing over 10 years; interest rate 1.1%) and the running costs for maintenance, measuring point operation, tax advice and insurance total over 74,000 €, the operator of this system makes within the 20th -year term, a total loss of almost €13,000. The interest rate is minus 2.1%. Nobody has to think long and hard about it: the feed-in system doesn't pay off.
This is different for self-consumption: In the example, it is now assumed that self-consumption of 25,800 kWh per year is possible with the same system size, the same yield and the same costs. "Then the feed-in revenue will drop to almost €28,000....
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