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Customer application 28 October 2020

Solar Power from Our Own Roof

If distribution networks are loaded to their limits, then network operators cannot issue connection permissions for new renewable energy systems to feed into the network. A pilot project in Bavaria is showing how a photovoltaic system can be economically operated purely for self-consumption.

In the past, operating PV arrays was primarily economical in that supply tariffs for the electricity guaranteed that the power produced could also be sold. However, the falling payments for electrical supply over the last few years have made self-consumption of the energy more important. Self-consumption becomes even more necessary, when the distribution networks are so overloaded that network operators can no longer connect systems for feed-in. This was precisely the case in Pottenstein in Upper Franconia. Klubert + Schmidt, an automotive supplier, wanted to install a PV array on the roof of their production hall there.

Controlling Photovoltaic Systems – Here’s How WAGO Supports You:

How Companies Use Their Own Solar Energy

In cases where solar systems for renewable energy generation cannot be connected a network, the company Münch Energie offers its customers a rewarding alternative with the WAGO Solution Provider “JPs Projects” Solution Provider:
Just use the energy yourself. With this concept, Münch Energie output nearly hits a level of 550 Megawatts a year – as much energy as half a power plant! With this much power, this company is the largest decentralized energy supplier in Germany – and WAGO Technology helps make it possible.

In this video, see how Münch Energie went from vision through pilot project – as seen on this website – to become leading trailblazer in keeping pace with the energy transition.

“Bayernwerk Netz GmbH, which operates the Pottenstein distribution network, was willing to link to the PV array with its peak of approximately 1000 kilowatts. However, the connection point was several kilometers away,” explains Sebastian Kremer, a project manager at M. Münch Elektrotechnik GmbH & Co. KG. The company operates its own photovoltaic and biogas systems and also plans and implements PV systems – including PV modules, brackets, control technology, inverters and network connections – for customers including agricultural and industrial operations. “Because energy costs are increasing just as prices for PV arrays are falling, solar energy consumption is more economical than ever,” emphasizes Kremer, who supervised the project for Klubert + Schmidt.

Although the supply from the planned system would have corresponded to the average electrical consumption of the producing company, the network operator initially balked at the request for a network connection directly at the company location. To obtain the connection release for the system, they had to ensure than no supply into the network would result. The network operator additionally demanded a security circuit that could shut down the system within ten seconds if a feed-in were to occur despite this.

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