If an earth bond is required between neutral and earth and your system is a hybrid system then you can
have a permanent earth wire since this can cause faults with an RCD before the inverter.
Since the inverter is a true hybrid then the bond must only be made when the inverter is operating in
Islanding Mode. To accommodate this, Sunsynk provides an AC output, which is connected to the A/T/S
connections whenever the inverter is running on Island Mode. Therefore, you can simply connect the coil
of an AC relay to the ATS 240 connections. Next, you need to select Signal Island Mode on the battery
charge menu (click on the gear icon -> battery icon), as shown in the figure below.
You can verify if there is a voltage when the inverter is disconnected from the grid by using a simple
multimeter.
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