About Us – BESSr GmbH

BESSr GmbH was founded in 2025 and is therefore a young company with a clear focus on modern battery storage solutions (BESS). Even though our company name is new, we look back on a long tradition: our founding partners have been successfully active in the fields of wind energy, photovoltaics, charging infrastructure and energy systems for around 20 to 25 years.

A defining figure of our company is Martin Rosendahl, managing partner of Rosendahl Windtechnik and NEA GmbH. He not only brings decades of experience in the field of renewable energies but also has extensive expertise in planning and project development – from rooftop PV systems to large-scale PV ground-mounted systems.

This wealth of experience forms the foundation of our work. We combine the freshness and innovative strength of a young company with the long-standing expertise and deep technical know-how of our partners.

Our goal is to actively drive the energy transition – with customized battery storage solutions that make renewable energies efficient, safe and economically viable.

With BESSr GmbH, you are choosing a company that is young in appearance but experienced in execution.

Team and Expertise

Our partner structure enables a unique combination of technical expertise, market access and network within the energy industry.

Hysum Technology Co. Ltd.

An innovative company from China specializing in the production of high-quality components – including ultra-low-resistance battery connection cables using ultrasonic welding. Its renowned customers include world-leading battery manufacturers such as CATL and BYD. Through these high-level connections, BESSr GmbH benefits from direct access to world-class quality products and is therefore ideally positioned to select and implement battery storage solutions based on the latest technology.

NEA GmbH

With over 20 years of experience in the photovoltaic and wind energy sectors, NEA GmbH is a recognized specialist in the technical operations management of wind turbines, photovoltaic systems and battery storage systems. Its range of services extends from continuous monitoring, analysis and optimization of systems to the coordination of service assignments and comprehensive project consulting. The goal is to minimize downtime, reduce costs and sustainably increase yields.

Together, the partner companies of BESSr GmbH offer a complete range of services – from the selection and procurement of market-leading battery storage systems to their implementation and on to long-term, efficient and reliable operations management.

Additional Partners

Coebiz GmbH
https://www.coebiz.com/

Green N-R-GY Temminghoff GmbH
https://www.green-nrgy.de/