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Dual XW system - Why does one XW inverter make a "clicking" noise when generator shuts off?

If Cascading is Disabled, it is possible to set the Lo AC Volts (Advanced Settings>AC Settings) to different levels, which would cause the inverters to disconnect at different times when the gen winds down. 
The Lo AC Volts for AC2 (Gen input) defaults to 80VAC for Lo AC Volts, which may have the effect of causing problems with loads if inverter allows the generator to wind down to 80VAC before transferring to invert mode. 
This issue would be evident when stopping the generator manually, because the XW AGS will provide a cool down period allowing the XW to drop transfer before shutting down the generator (when set for Automatic).
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