Bosch Unwraps New Module Prototypes

At EU PVSEC (European Photovoltaic Solar Energy Conference and Exhibition), Bosch Solar Energy AG presented three prototypes of new crystalline and thin-film modules.

At EU PVSEC (European Photovoltaic Solar Energy Conference and Exhibition), Bosch Solar Energy AG presented three prototypes of new crystalline and thin-film modules.

In the medium-term, Bosch Solar Energy’s thin-film product portfolio is to be supplemented  by a micromorphous product with a frame. With its thermally toughened front glass panel, it has a mechanical strength of 2400 pascal. Weighing in at only 16 kilograms, it is substantially lighter than conventional thin-film glass-glass laminates, which weigh around 25 kilograms. Furthermore, it can be mounted using the assembly systems that are already well established in the market. A “low voltage concept” is also in preparation. This low voltage means less wiring work for installers. “This concept takes account of our customers’ requirements, and we plan to have it ready for series production in the medium term. Due to its special properties, this module type is highly suitable for steeply sloping roofs and roofs that do not face full south,” said Peter Schneidewind, the management board member of Bosch Solar Energy AG responsible for sales. The new module prototypes also include a crystalline solar module on the basis of black monocrystalline silicon solar cells. With a black anodized frame and black backing foil, this model has been given a completely monochromatic design to satisfy the strict demands made on appearance in special architectural settings.

Demonstration of an MWT module
Bosch Solar Energy also unveiled its first monocrystalline “MWT rear-side contact cells” (metal wrap-through cells), developed together with ISE, the Fraunhofer institute for solar energy in Freiburg, Germany. In this cell, which is integrated in a high-performance panel, the front bus bars have been shifted to the back of the panel. This means that the areas of the solar cell that were hitherto “shaded” are now available for converting sunlight into electrical power, and the solar cells’ efficiency is enhanced. “We are quite proud of this successful project work. After all, no other company has so far been able to implement the MWT cell concept with monocrystalline wafers,” says Dr. Hans-Joachim Krokoszinski, Head of Engineering Crystalline Cells, describing the first results of development in the field of MWT rear-side contacts. Work has now started on the final project phase, in which the contact structure and process parameters will be optimized.
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