Under CopyrightCraciun, D.D.CraciunHeckmann, W.W.HeckmannSchäfer, N.N.SchäferArnold, G.G.Arnold2022-03-1210.11.20152014https://publica.fraunhofer.de/handle/publica/38939610.24406/publica-fhg-389396The market outlook for utility-scale PV installations is very positive. These PV plants have the capability to support the grid operation and this capability is requested more and more in the grid codes. But testing theses capabilities of very large PV inverters isdemanding for laboratories. Current developments and resulting challenges are exemplarily described inthis paper. Gaps and diversity in testing guidelines and standardization are also addressed.enpresentation