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Tesla as a power source for home appliances?

I had an idea while reading the thread called "Those door handles" which is about dealing with door icing. Hopefully Tesla will provide handle heaters to deal with the issue. In the discussion, somebody mentioned a hair dryer as a solution. Great if you're parked near a power outlet. If not, you'll also need an extension cord. That's when I thought; "Wouldn't it be nice to have easy access to a little of the electricity sitting in the big Tesla power cell for other purposes if needed?" Imagine an outlet on your Tesla to power appliances like; an electric razor, computer, boom box, TV, power tools, George Foreman grill; you get the picture. I can imagine many situations when it would be convenient to suck off a few watts.
All cars have 12VDC outlets to power any number of devices. The Tesla should support those, but it would also be nice to have a 110 VAC outlet (for USA, or other geographically appropriate power outlet). It beats idling an ICE for power, using generators or using 12VDC/110VAC inverters for powering home appliances. Sounds like a tailgater's dream...which could become a nightmare if you get stupid and try to run a clothes dryer. Could also be a life saver in some emergency situations.
I don't understand the technology well enough to know if a person would quickly deplete the batteries or if you could run a radio all day and barely notice to usage. I don't know if this would involve a lot of expensive engineering or could be easily integrated into the design.
So, is this a stupid idea or does it make some sense? Is it practical or a cost prohibitive engineering task? Would you love it, hate it, or not give a fig?

Also note that a portable inverter in the Roadster will damage the 12V feed and is not covered by warranty (as one owner found out -- the hard way). Not clear if innverters are supported on the Model S.

@jerry3: I wasn't clear enough.

You program the car to start charging at the lower power rate time, perhaps at 10PM, to get a cheaper rate.

The sun sets and local air conditioners start switching off at 8PM. As the local power company spools down, it tells local EVs they may start their low cost charging immediately.

If the message doesn't come through, the car starts charging at 10PM as pre-programmed.

This would have to be a totally optional feature for both sides. The EVs may not be plugged in or may need to be charged sooner, and the local power company may have various reasons not to send the message.

EdG, that's precisely where the "intelligent grid" is heading. Only that it's not a single bit, like on or off. Rather, it's a more or less continuously adjusted electricity rate. You could tell your car to guarantee a charge of x% by y o'clock but charge up to full if the rate drops below z ct/kWh. Or start charging only when the rate drops below z ct/kWh, unless/until the charging needs to start to get to the desired charge level by the morning, whatever the rate. Or any other algorithm someone can think of and implement as a 3rd party app (some day in the not-too-distant future).

With enough cars, it might help take the edge off an otherwise abrupt drop in load. (EdG)

Yeah, that's the idea behind it.

EdG, I did not notice your second post at first. My above reply is responding to your post on the previous page. Seems that we are pretty much on the same page now! ;-)

EdG,

Okay, that makes sense.


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