This is a little off topic, but....
All of the receptacles in my Class-C are powered from my integrated inverter.
I've considered installing a couple of USB receptacles of the type being discussed in this thread. But, I ruled it out because of residual parasitic power draw.
In order to deliver 5 VDC to a USB port, the combo receptacle must include a small AC transformer, a rectifier, and a filter. These components will necessarily draw a small amount of power, whether or not they are being used. And, there is no provision for turning them off to stop that. I know it is only a tiny amount of current but, when dry camping, every little bit matters.
Why would anybody want to add something to their rig that continuously wastes a small amount of power?
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