This report summarises the results of the IEA 4E EMSA international Round Robin testing programme for converters, implemented in cooperation with IEC SC22G/WG18.

The goal of the Round Robin was to support the revision of IEC 61800-9-2 with science-based evidence. It has shown that almost all converters on the market easily reach the IE2 class. Further differentiation of the efficiency classification of converters would be possible by adding more classes and revising the threshold for each class.