I lived in a house that was totally off grid. It actually was never on grid, because the owners already had a wind turbine back in the day when the utility companies where doing the rural electrification project, and declined to be added to the grid. This house had coal heat, gas and wood stoves, gas refrigeration, and no AC at all. Located in central Montana, it was equipped with a bank of around 12 CAT bulldozer batteries, (which replaced about twenty 1 gallon square glass jars with lead plates) over 200 square feet of solar panels, a small wind turbine (about a 2 foot blade) and a backup propane generator, that was set up to automatically start up and top up the system if it dropped below a certain charge level.
So basically, all the system had for load was incandessent bulbs, and occasionally a television. In the winter, that generator ran intermittently during the day, and after dark, it ran until you went to bed, and shut all the lights off.
Obviously, using LED's and more power efficient TV's is possible now, but it takes a hell of a setup to go all off grid. (you could not run a modern computer or a microwave on that system, the computers where to sensitive to the square sin of the inverters, and would randomly restart. Microwaves would pop breakers if not plugged in directly to the generator.)