This is a curiosity question as much as anything. I did a search on this and not much came up beyond very early threads about Roadsters. I understand that the problem with using any electrical source it has to be clean for the MS to accept charging. With today's inverter generators that generate very clean energy why couldn't one be used in a pinch. Say my wife runs out of power and is stuck a few miles from the house. Put the inverter generator in my pickup and plug the car into it for a hour or two to get the car home. Probably very slow charging...I get that. But like I said....in a pinch.