Is Anti-Islanding protection available?

It is technically possible, but it is currently not implemented. As grid certification is conducted this feature will be implemented for various grid certifications. Of course, anti-islanding only makes sense while the inverter is in On-Grid mode (parallel to the grid). Regardless of this function, if the grid voltage falls outside the limits (170 ~ 280 Vac and 40 ~ 65 Hz in UPS mode for 230 Vac models, half that for 120 Vac models), the PSW-H automatically switches to Off-Grid mode. When it disconnects from the grid it is galvanically isolated from the grid. There is no connection between neutral or a line and the grid and that.