[Richard]

Again, I know NOTHING about Outback inverters. But I am always amazed at the ambiguity in the English language so forgive me for asking some detailed questions, because I do not know what you mean by inverter shuts off.

Do you mean while on gen power the pass through portion of the inverter fails, meaning the outlets that are powered by the inverter when on battery power, no longer operate?

Or do you mean, that the inverter is no longer charging the batteries?

Or do you mean all circuits stay powered up, but the Inverter is ON Light goes off?

I think you mean the first one, the inverter based circuits go dead when on gen power. If so, and you state it never happens when on pedestal. It never happens when using battery to provide power through the inverter, then I would suspect some burned points in the ATS switch. If this is the case, then it’s not the inverter at all, but rather the inverter pass through is not getting power on that leg from the ATS.

Are your voltage meters where you can see them when driving? If so, does the voltage drop to zero on that leg when the issue occurs?

If I have guessed right, then you can (after unplugging everything and making sure the gen won’t start)take a flex hone and slip between the points on the contactor in the ATS. If that cures it, go ahead and replace the entire contactor soon. In my experience, cleaning up the burned contact points doesn’t last very long unless you can burnish them.