1. Fraunhofer Institute for Solar Energy Systems (ISE) Heidenhofstraße 2 Freiburg 79110 Germany
2. Department of Sustainable Systems Engineering (INATECH) University of Freiburg Emmy‐Noether‐Straße 2 79110 Freiburg Germany
3. School of Engineering University of Warwick Coventry CV4 7AL UK
4. University of Konstanz Universitätsstraße 10 78464 Konstanz Germany