Chalcopyrite thin film photovoltaic modules with CuInS2 absorber layers have been fabricated using a sequential process. Apart from single solar cells, a large quantity of complete integrated series connected mini modules on 5x5 cm2 glass substrates have been prepared at the Hahn Meitner Institut using this baseline process. At the same time, commercial CuInS2 based modules of 1.25x0.65 m2 size, fabricated by the same process, have been introduced into the market by the company Sulfurcell. This baseline process has been subject to a re evaluation of numerous parameters involved in device fabrication. As a result, a considerable improvement in mini module performance was achieved within a one year period. Commercial CuInS2 modules are available from Sulfurcell exhibiting 50 55 Wp output power