2011 Itasca Ellipse, where is the inverter actually located on the rig?
Don't know which model of 2011 Ellipse you have, but looking at the Body, 110V Wiring Installation diagram for the different models all show it (see View DA) located roughly on the coach centerline, inboard of the power cord reel.
You can access the complete wiring diagrams for your coach here: Wiring Diagrams
It is located near the center of the coach and behind the Aquahot, same compartment as the power reel. Access it by removing the metal panel from that compartment on the passenger's side, about a dozen screws. The panel is a bugger to re-install. I left the panel off - opens up a little more space in that compartment.