According to the data sheet, this is a transformerless inverter, otherwise known as a "non-isolated" inverter, meaning that there is no isolation transformer between the dc and ac sides of the inverter. In that case—at least with PV systems—the dc system is ungrounded. (See 690.35; I don't see a parallel section in Article 694 for small wind.)
In this application, you only have dc between the rectifier and the inverter. The native wind turbine output will be wild 3-phase ac. The rectifier manual only refers to an EGC; there is no reference to a GEC.
