Has the mains and system protection been tested? Since it became known a few days ago that various microinverter manufacturers such as Deye have defrauded millions of customers in this respect, it must be assumed that Hoymiles and similar Chinese firecrackers do not comply with VDE AR-N 4105 either. The reports on Deye products are damning. The Federal Network Agency in Germany became aware of this during a subsequent EMC test of a DEYE inverter. The VDE AR-N 4105 prescribes that a mains coupling relay must be present so that a galvanic separation occurs and thus the inverter can be operated in a safe manner. Can Digitec guarantee that the Hoymiles inverter complies with VDE AR-N 4105:2018? The relay was simply omitted from the Deye inverters concerned! Although according to the certificate one should be installed.