End of January Solarzentrum Stuttgart delivers a DaySy Pro 1000 system to Fraunhofer ISE, Freiburg, Germany, department "quality assurance for PV modules and power plants". Included is of course a theoretical and practical training session for Fraunhofer ISE team in using DaySy in PV systems. Hence, DaySy checked an PV test system on ISE rooftop. Freiburg did its best to make outdoor winter conditions as comfortable as possible: Sunshine accompanied our DaySy EL measurement of mc-Si modules.