Bosch Power Tec

Sponsored by the Federal Ministry for the Environment, Nature Conservation, Building and Nuclear Safety: Research for more efficient energy consumption and more stable power grids The project aims to highlight the benefit of solar energy storage for end users and distribution networks

  • PV storage systems play a decisive role in the energy revolution
  • Greater private consumption of solar energy can contribute to the stabilisation of the power grids
  • 4 companies and 3 research institutes are cooperating in the project
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  • March 03, 2014
  • Bosch Power Tec
  • Press releases

press release

Böblingen – January 2014 saw the start of the research project Sol-ion+: Seven partners from the fields of research and industry aim to prove that the storage of solar energy offers many benefits not only to the end user but also to the stabilisation of distribution networks. Such storage systems enable the consumer to draw significantly less energy from the public power grid and, instead, to use more electricity from their own photovoltaic system. The scalability of these systems also makes it possible to achieve higher outputs, so that they can absorb power fluctuations when used in the public power supply, thereby increasing the stability of the electricity supply.

Preparing for the energy markets of tomorrow
The first phase of the project, which runs until the start of 2018, involves plans for the development of a storage system which can also be used in the consumer sector. Bosch Power Tec, as a manufacturer of storage systems for solar energy, is the project coordinator, entrusted with the task of developing this device. "The new generation of storage systems will enable users of the system to actively participate in future energy markets for the first time", says Dr. Armin Schmiegel, Project Manager at Bosch Power Tec. "The systems enable optimal interaction between the network and storage operators so that they can supply their self-produced power to the electricity exchange or, if required, purchase cheap electricity".

Saft Batterien, the German sales company of the Saft Group, provides the battery technology: "Due to the interaction with the grid, the batteries have to work considerably harder here than in existing storage systems. Sophisticated lithium-ion technology and control engineering are necessary to ensure the highest degree of efficiency and a long service life" explains Holger Schuh, Managing Director of Saft Batterien GmbH in Nuremberg.

PV storage systems are of central importance for power grids
Stadtwerke Mainz Netze GmbH and Überlandwerk Groß-Gerau GmbH (ÜWG), two additional project partners, determine the specific demands on a grid-supporting system. A total of 17 storage systems are going to be installed as part of a field test in the ÜWG Stromnetze GmbH & Co. KG grid area in the Groß-Gerau district. "The future lies in innovative storage technology for the power grid. This is what makes our grid intelligent and enables the grid to meet demand for further flexibility" comments Jürgen Schmidt, Technical director of Überlandwerk Groß-Gerau GmbH, explaining the objective of this project. Stadtwerke Mainz AG, as the majority shareholder of ÜWG, supports the project. "Renewable energy must and can make a significant contribution to system stability. Local storage systems, which can provide energy at any time and are operated by highly efficient power electronics and suitable algorithms, are virtually predestined for the task. The Sol-ion+ project takes up the important task of grid usefulness and implements it for real PV storage systems", says grid expert Lars Nehrkorn of ÜWG.

The Fraunhofer Institute for Wind Energy and Energy System Technology (IWES), the Centre for Solar Energy and Hydrogen Research Baden-Württemberg (Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg – ZSW) and the ISEA of RWTH Aachen University support the project with the development of battery charging strategies and ageing models, analyses of system performance and grid-supporting management as well as field test supervision. Another important issue is the analysis of cost-efficiency.

In 2016, the field test will begin parallel to the installation of a combination of systems to support the grid and the installation of individual systems at the end user, and will have a runtime of 12 months. The project builds on the successfully completed "Sol-ion" project of 2012 and is also sponsored by the Federal Ministry for the Environment, Nature Conservation, Building and Nuclear Safety (BMUB). The runtime is four years.
The previous "Sol-ion" project ran from 2008 to 2012. The results and experiences gained from this project led to the development of Bosch's BPTS-5 Hybrid which was introduced in 2012.

The participants:
Federal Ministry for the Environment, Nature Conservation, Building and Nuclear Safety
Bosch Power Tec GmbH
Saft Batterien
Fraunhofer Institute for Wind Energy and Energy System Technology (IWES)
Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW)
Institut für Stromrichtertechnik und Elektrische Antriebe (ISEA)
Stadtwerke Mainz Netze GmbH
Überlandwerk Groß-Gerau GmbH (ÜWG)

Bosch Power Tec GmbH is a 100% subsidiary of Robert Bosch GmbH and was founded in January 2011. The business purpose is the development and sales of electronic power components for the use of renewable energies. The portfolio includes highly-efficient solar inverters, pre-fabricated inverter stations, system management solutions and pioneering electricity storage technologies. Extensive service and maintenance contracts for every product group enhance the Bosch Power Tec range.

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The Bosch Group is a leading global supplier of technology and services. It employs roughly 375,000 associates worldwide (as of December 31, 2015). The company generated sales of 70.6 billion euros in 2015. Its operations are divided into four business sectors: Mobility Solutions, Industrial Technology, Consumer Goods, and Energy and Building Technology. The Bosch Group comprises Robert Bosch GmbH and its roughly 440 subsidiaries and regional companies in some 60 countries. Including sales and service partners, Bosch’s global manufacturing and sales network covers some 150 countries. The basis for the company’s future growth is its innovative strength. Bosch employs 55,800 associates in research and development at 118 locations across the globe. The Bosch Group’s strategic objective is to deliver innovations for a connected life. Bosch improves quality of life worldwide with products and services that are innovative and spark enthusiasm. In short, Bosch creates technology that is “Invented for life.”

Additional information is available online at and,

PI8475 - March 03, 2014

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