Clearly people need to be responsible in how and where they use the feature but this is how the Ford F-150 Hybrid with ProPower inverter works. The YT channel Pickup Truck and SUV Talk demonstrated powering a RV camper AC with the inverter operating just like that. It starts on battery only, then switches on vehicle as it drains the small hybrid battery capacity. 12 minute video below shows it.I kinda doubt it would automatically turn on when it gets low. Image it turning on in someone's garage and filling it with carbon monoxide... I bet it would cut power off if it got below a certain threshold, though.