I completed some testing.
1. Removed the battery cables from the input side of the inverter. They measure 12.8V when not connected to the inverter. Once connected the measurements at the terminals drops to 7'ish volts. Something is fishy.
2. Unlplug from shore power and plug back in. You can hear the inverter "click". I went an measured the voltage at the batter terminal input and the reading was inconsistent each time I disconnected and reconnected shore power.
Everything points to a bad inverter.
__________________
|