Josefine Helene Selj is a researcher at the department of renewable energy systems at IFE. She holds a PhD in electrical engineering, both from the University of Oslo. She has worked with PV at IFE since 2007 and is currently group manager for the PV systems group at IFE. Her research is focused on performance and reliability of PV systems. She also holds a position as associate professor II at the Institute for Technology Systems, UiO.