Inverter electrical plug

[Molly Presto]

What is the male pigtail coming out of the inverter for? It doesn't seem to be plugged in to any outlet. Thank you.

[68 Overlander]

It's for the inverter bypass relay. When plugged into an outlet and AC is sensed, it will shut down your inverter to prevent damage. Conversely, if your inverter is on and in the standby mode and AC power is lost, it should kick the inverter on, similar to an uninterrupted power supply (UPS) Often they install a separate transfer switch/relay instead and in that case it would not be needed since they essentially do the same thing.

[Molly Presto]

Thank you. So how do I know whether I have a separate transfer/relay switch and therefore do not need to plug it in?