This all circles back to: If the RV was a hybrid then you just hook your inverter up to the traction battery of the hybrid and then let the system automatically charge up the traction battery when it needs to just like it would if you were driving down the road.
The thing here is, however, the traction battery would be large enough (by several factors) to run the A/C overnight without the engine starting up at all--it takes far more power to move the coach than to cool it.
Now you're not idling a large V-10 you're idling a V-6 or even I-4 (most likely Atkinson cycle as well). In addition, all the OEM controller's used to keep a charge on the traction battery would not change--its just that the traction battery would be draining from the house systems instead of the motors connected to the wheels.
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