You might be able to do this with a Tesla but you'd discharge the batteries. And don't let them fully discharge, or you'll have to replace the 1,000 pounds of lithium batteries at a cost of anywhere between $5 and $40,000. The Toyota would actually generate the electricity -as much as 100KW. Average KW consumption is ~30kwh/day
Remember that this power comes from a renewable source- Hydrogen- that can be made by anyone with access to electricity- from any source- with water as exhaust.
CES 2014: Toyota Wants Its Fuel Cells to Also Power Your Home in a Pinch

Toyota's CES press event yesterday was mainly dedicated to discussing the state of the carmaker's hydrogen fuel-cell program and the current state of hydrogen refueling infrastructure. But one particular aside tossed off by Toyota's senior vice president, Robert Carter, stood out. According to Carter, Toyota is also working on an external device that would allow a hydrogen fuel-cell car to charge a house for up to a week in case of an emergency.
The idea is not far-fetched. Between its fuel-cell program and the Prius, Toyota has invested heavily in battery R&D. According to Carter, Toyota's current fuel stacks, which combine oxygen and hydrogen to create water and electricity, can store up to
100 Kw of power. Considering that's the same amount of power in some commercial generators, powering your average house sounds feasible. In fact, it sounds kind of brilliant...
http://www.popularmechanics.com/cars/news/auto-blog/ces-2014-toyota-wants-its-fuel-cells-to-also-power-your-home-in-a-pinch-16353888
Honda Begins Experiments with Hydrogen Home Energy Station and Improves Solar-Cell Technology for Production of Hydrogen
http://world.honda.com/news/2003/c031002.html