Foto de stock - 26 October 2023, Bavaria, Nuremberg: Babett Ludwig (l), Stefanie Eski and Florian Brütsch from the Schülerforschungszentrum Südwürttemberg (SFZ) present their circuit board for increasing efficiency for photovoltaic systems during the Innovation Show at the International Inventors' Trade Fair ""iENA"". By connecting photovoltaic systems in series, the total power depends on the cell with the lowest power. The invention supports shaded cells with the energy of the total string and can thus compensate for power differences and thus the total possible power can be utilized. The International Trade Fair for Ideas, Inventions and New Products (iENA) will showcase 800 inventions to the trade public from October 28 to 30. This year's partner country is China. Photo: Daniel Karmann/dpa. - Nuremberg/Bavaria/Germany