1. Your inverter should be downstream of the panel, on its own breaker (if the breaker is 20A, then you won't have to remember how to get at the 25A breaker built into the unit. It then can feed a subpanel, or, like I did on my boat, feed the breakers on one side of the panel (Blue Seas panels
allow you to disconnect columns of breakers to allow different feeds.
2. I checked the Xantrex website, the installation
instructions showed connections for AC input and output, but no factory-attached AC wires, so I'm not sure what you're looking at.