Author
Jochen Siemer
Jochen joined pv magazine in 2023. He began working as a freelance journalist in 1988. A few years later, he found himself focusing on renewable energies. Since 2021, he has dealt exclusively with photovoltaics in all its aspects – from scientific studies on the development of the global market to the product presentation of a new roof hook.
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Articles written by Jochen Siemer
Pilot project in German lab tests high voltage battery storage system at up to 20 kV
The KV-Batt research project aims to reduce battery system energy losses by operating at up to 20 times the usual voltage. A long-term practical test will take place after the development of high-voltage-resistant components.
Oct 16, 2025
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Day-ahead European electricity market switches to 15-minute intervals
More accurate mapping of renewable energy generation is expected, which could bring advantages for solar sites involved in direct marketing. Customers with dynamic electricity tariffs or load management, as well as battery storage operators, are also likely to benefit.
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German state of Bavaria wants to end ‘wild growth’ of battery storage
Bavarian Minister-President Markus Söder, and Economics Minister Hubert Aiwanger, believe grid capacity for gas-fired power plants, industry, and data centers is being blocked by requests to connect battery energy storage systems (BESS). Federal council the Bundesrat will consider a Bavarian proposal to accelerate grid expansion at its next meeting.
New real-time measurement process can determine State of Charge and battery operational safety
A method developed at Fraunhofer IFAM, known as "dynamic impedance spectroscopy," provides real-time data on a battery's safety status and more, all while it's in operation. This breakthrough is set to enable optimized battery management in electric vehicles and is also intended for applications like photovoltaic storage systems.
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German battery maker Customcells files for insolvency
The battery technology company, spun out of the Fraunhofer Society in 2012, was reportedly unable to compensate for payment defaults by a major customer: flying taxi developer Lilium, which has been insolvent since February. The payment of CustomCells' 200 or so employees is guaranteed until June.
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