Living off the Grid

I've often thought about going off the grid - electricity only - but this infographic shows that it doesn't take a lot (compared to what most people think) to live off the land. It does not speak to the fact that doing this sort of thing would be a lot of work.

I'll stick with kicking electricity to the curb... and apparently I'll need a good roof full of solar panels to do it!
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What would it take for a family of four to live off the grid for a year