Patrik Ollas is an industrial PhD student at RISE Research Institutes of Sweden. He received his MSc. at Chalmers University of Technology in mechanical engineering in ’12 and has since then worked with testing and research in solar energy – including both solar thermal and photovoltaics. The PhD work focuses on energy savings from direct current (DC) distribution in buildings and the potential for grid flexibility services. Research contributions include quantification of the energy savings with DC distribution, detailed battery characterization and measures to enhance the PV utilization.