Well, in fairness, the Second Law is far from elementary. Conservation of Energy is another matter , however. It is quite simple. Energy Out = Energy In. Or even simpler: TANSTAFL. (There ain't no such thing as a free lunch.)No batteries required. It is plugged into the wall. Of course he says that is to feed power to the grid, but we know better.
It is a sad commentary on humanity that so many people cannot grasp the second law of thermodynamics.