Business/economy

Independently-generated power: optimum energy supply Bosch supplies energy storage system for pioneering housing complex Capacity of 135 kilowatt-hours

  • The customer is Süwag Erneuerbare Energien GmbH
  • Promoting the move toward alternative forms of energy
  • Turnkey solution based on lithium-ion technology
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  • March 04, 2014
  • Business/economy
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press release

        A constant supply of renewable energy: while others are still heatedly debating
        about the move to alternative forms of energy, a housing complex near Frankfurt
        is setting new standards. As much as possible, the complex is designed to be
        self-sufficient in its energy needs. Not only that: it also saves its residents money
        in the process.


Stuttgart and Kelsterbach – The move toward alternative forms of energy is taking shape in Kelsterbach, a town close to Frankfurt, Germany. Bosch is supplying a flexible energy storage system for a housing complex that is currently under construction there, which comprises 180 townhouses. The system has an installed capacity of 135 kilowatt-hours. “On paper, this is the equivalent of the daily power requirements of ten average four-person households,” says the Bosch project manager Wolfgang Mollenkopf. The customer is Süwag Erneuerbare Energien GmbH, which is promoting the move toward alternative forms of energy with a concept of its own. The start of operation is planned for the middle of May.

Contribution to a decentralized power supply
The energy storage system meets one of the greatest challenges of decentralized power supplies. The housing complex's combined heat and power unit and solar power station do not always generate power when it is needed. Thanks to the battery, the extra power can be stored and made available later on. “We are pleased that our technology is helping Süwag implement its pioneering concept,” says Cordelia Thielitz, who is in charge of stationary energy storage systems at Bosch.

The highest possible level of self-sufficiency
“Enka,” as the new housing complex is called, is being built on the site of a former factory. The construction company Deutsche Reihenhaus AG is building 180 townhouses there. A mixed-use development and a business park will be built in a second phase of construction. When completed, the neighborhood should be able to meet a large share of its own energy needs, since it will be equipped with two combined heat and power units in addition to peak load boilers, solar power, heat storage, and electricity storage systems. The system will use the power generated in the complex in the best way possible. The efficient combined heat and power unit will meet the base load. A natural gas-powered internal combustion engine in the unit will generate electricity with the help of a generator. The heat generated in the engine as a result of combustion will be used to heat buildings or water.

Since less power is consumed at night, the large Bosch battery stores energy and releases it whenever it is needed, for instance in the morning. “It's a similar picture with solar energy,” says Cordelia Thielitz. “The sun shines and delivers a lot of energy during the day, when families aren't generally at home. The battery stores the energy until it is needed in the evening.” In terms of its power supply, Süwag aims to make the complex as self-sufficient as possible. “Every kilowatt hour that doesn't need to travel great distances reduces the need to invest in and expand the grid. It also makes integrating renewable sources of energy into the wider system easier,” the company says.

Consumers within the residential complex are directly connected to the power generation system. As a result, there are no transmission charges or similar costs. And for residents, electricity rates are significantly cheaper than usual. The Frankfurt University of Applied Sciences is providing the project with scientific support.

Turnkey energy storage systems
The Bosch turnkey energy storage system makes use of lithium-ion technology. The storage unit is some seven meters wide, about 60 centimeters deep, and 1.8 meters high. It is located in a machine room on site. Its capacity and electronics are precisely aligned to the needs of the complex's power grid.

The storage system has an output of 50 kilowatts and can be charged or discharged within two hours. Thanks to its inverter, power can be fed into and drawn from the customer network. The right battery system management and Bosch experience in the area of battery charging and discharging increase battery life. Bosch plans, engineers, and builds a range of storage systems, up to megawatt-hour capacity. In this way, Bosch makes an important contribution to sustainable power supplies, true to the company's strategic imperative “Invented for life.”

Background: energy storage systems
Energy storage systems are a key element in the move toward alternative forms of energy. They make it possible to better utilize wind and solar power, whose availability can fluctuate widely. Solar power can be made available at night, and wind power can be stored for times when winds slacken. A Bosch-commissioned study published by Öko-Institut e.V. in Freiburg rightly describes energy storage as a strategically important field of technology. Such systems will play a decisive role in the development of a decentralized power-supply infrastructure.

First and foremost, they can compensate for fluctuations in power generated from the wind and the sun. At the same time, they can act as a buffer for use in the event of unforeseen fluctuations. As a result, energy storage systems make it easier to integrate renewable sources of energy into existing power networks. This makes them an important part of smart grids, as well as an alternative to network expansion. Moreover, they help harmonize power supply and demand.

Background: combined heat and power units
Combined heat and power (CHP) units generate electricity and heat with either fossil fuels or renewable sources of energy. CHP uses the same amount of energy to generate twice the benefit. With conventional technologies, heat and power are generally generated separately. CHP combines the two, thus reducing the need for fuel. In a study written for the state of North Rhine-Westphalia, the government energy agency EnergieAgentur.NRW writes: “Its application offers enormous potential for protecting the climate and conserving resources.” If a CHP unit is needed to generate heat on a cold winter's night, for instance, the power generated at the same time can be stored in the battery until the next morning.

Contact:
Kerstin Rittler,
phone: +49 711 3653-1524

Internet:
Süwag information on the project:
http://bit.ly/1eZyBGn (only available in German)
http://bit.ly/1fcP1dV (only available in German)
Öko-Institut study:
http://bit.ly/10ORVgr (only available in German)

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.”

The company was set up in Stuttgart in 1886 by Robert Bosch (1861-1942) as “Workshop for Precision Mechanics and Electrical Engineering.” The special ownership structure of Robert Bosch GmbH guarantees the entrepreneurial freedom of the Bosch Group, making it possible for the company to plan over the long term and to undertake significant up-front investments in the safeguarding of its future. Ninety-two percent of the share capital of Robert Bosch GmbH is held by Robert Bosch Stiftung GmbH, a charitable foundation. The majority of voting rights are held by Robert Bosch Industrietreuhand KG, an industrial trust. The entrepreneurial ownership functions are carried out by the trust. The remaining shares are held by the Bosch family and by Robert Bosch GmbH.

Additional information is available online at www.bosch.com and www.bosch-press.com, http://twitter.com/BoschPresse.

PI8443 - March 04, 2014

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