For a reliable and low cost electricity supply

Supply security is the key word of the energy revolution. At the same time, it is the subject to which the solar company RWenergy is currently giving its full attention. The subsidiary of the Rädlinger Group has made it its mission to pave the way to a self-sufficient, ecological and low cost electricity supply. But that is not all.

As a proven specialist company, RWenergy is performing all the 50.2 Hz retrofitting work in the domain of the network centre in Regen, within the framework of the System Stability Regulation. The large order from Bayernwerk AG includes work on approximately 6000 photovoltaic systems. Operators of PV systems who are affected by the System Stability Regulation and have to retrofit their inverters have received a letter from their network operator in relation to this. If a specialist company with specialist expertise and trained staff, commissioned by the network operator, such as RWenergy, performs the retrofitting work, the owner of the photovoltaic system does not incur any costs.

The objective of the System Stability Regulation is to improve supply security. To this end, inverters attached before 2012 are set for higher frequencies of up to 51.5 Hz. The aim is to prevent smaller electricity generation systems, such as PV-systems, from disconnecting too early in high frequency periods. This happens if a lot of electricity is fed into the grid, but only a small amount is consumed. Nowadays, solar systems are responsible for an important share of the general electricity supply. If they all disconnect at the same time, the frequency would fall too abruptly and the supply security would be put at risk. In the worst case, this could lead to a large-scale failure of the electricity grid, a so-called blackout.

For their own supply security and independence from electricity price increases, the Technical Director of RWenergy, Dieter Janker, recommends clients to rely on a combination of a photovoltaic system and a storage battery: “It is not without cause that the PV systems have developed into an important pillar of electricity supply in Germany. And even if the feed-in tariffs have fallen, self-supply is profitable to date, and the profitability can be significantly enhanced by modern storage solutions.”

About 30% of personal requirements can be covered by this kind of little power plant on the roof. When it is combined with a suitable battery system, even approx. 75% of the electricity consumption can be covered. And that pays off. The average annual consumption of a four-person family is approximately 5000 kWh. With a current electricity price of 28 cents per kilowatt hour, this results in an electricity bill of € 1,400 at the end of the year. But not for someone who takes energy from his own PV system. He keeps € 420 at the end of the year and when the system is combined with a storage battery solution, he even saves approx. 1050 Euro. And that’s without including the feed-in tariff for feeding the excess into the grid. The current tariff of approx. 13 cents per kilowatt hour fed into the grid is added to this. With a system size of 10kWp, this is approximately € 1000 per year. A storage battery increases the amount by another € 330.


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