No, it is a backup system. In the event of grid failure, the Sunny Island inverter will switch off (as will the PV inverter, if present). The Sunny Island will transmit the signal to the disconnection board to disconnect the complete installation from the public electricity grid. Disconnecting from the network will take about 5 seconds. From that moment on, the Sunny Island will itself create a 230 V 50 Hz network in house. When the Sunny Island notices that electricity is being supplied once again by the electricity company, it will synchronise with it and switch back over to the public grid automatically and without interruption.
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