Although this product is dodgy as hell - backfeeding AC into a wall outlet is never a good idea, really - I am not a big fan of the anti-islanding requirement simply because it solves an unrealistic problem. I mean, the goal behind such legislation seems reasonable on the surface - prevent utility workers from getting electrocuted from a solar PV + inverter system backfeeding to the grid - except it totally fails to acknowledge that even a relatively massive 10kVA system would be immediately overloaded if the mains dropped out. A more practical solution that would allow the system to act as backup power in the event of an outage is a fast-acting overcurrent trip that requires manual resetting and, perhaps, also notifying the user to open the main circuit breaker before doing so (via, say, a message on an LCD front panel or the like).