Thanks for the input....
It looks like the general receptacles and the microwave are on two different circuits. I may need to change approaches and just dedicate the inverter to one circuit to feed the general receptacles.
I'm considering the Xantrex ProWatt 1000 with the Xantrex inline transfer switch.
So, the Xantrex Inline Transfer Switch has the following:
1. AC input 1 from inverter (inverter plug)
2. AC input 2 from utility
3. AC output to load
The actual wiring to the electrical panel is my biggest confusion.