Is it possible to fabricate a charge cable connector that would allow one Tesla to share charge with another? It would be very handy if you were stuck in a lonely place and another Tesla came along with charge to spare.
A male to male plug between two MS's? That is just so wrong on many levels.
Down @Rheumboy... It's not going to happen to your MS.
Calling AAA with the EV charger may cause much less headaches.
While not possible with the MS (or any EV to date?), others have talked about the possibility to export power from an EV. The idea is to allow powering your house from the car's battery in the event of a power failure or powering the grid under high electrical demand (and paying the EV owner for the electricity). While technically this is cool, I suspect it would add significant costs. Should such a system be created, it might be possible to help a fellow EVer out, but more likely there will be a range of incompatible formats, such it might only work with one brand or model of EV car.
@TeslaTap - Nissan already has a pilot program running in Japan to provide power to a building via a chain of Leaf during the day time.
It is a neat idea but it accelerates the up charge/discharge cycle of the battery. I think the battery packs are rated for 300 full charge cycles.
Not a good idea for the MS to earn a few bucks here and there only to require a battery pack replacement prematurely at over $40k.
"Nissan already has a pilot program running in Japan to provide power to a building via a chain of Leaf during the day time."
Using Leafs? So that would be like, what, five minutes of power? LOL!
Japan, Leaf, and CHAdeMO has addressed this - grid load management and backup power.
It is not something being pursued by Tesla at this time, and they void the warranty if someone else uses a Tesla in this manner.
While the SP01 does't "exist" yet, the idea was to have the cars battery attached your home "grid". While I don't understand why I would want my car powering my home instead of the sun or wind or water or natural gas, it could theoretically be used for charging another car.
^^that is the Detroit Electric car
To go back to the original question...
A simple direct cable connecting the batteries would not work, because the required voltage to charge is higher then the voltage available when discharging.
What would be needed is an inverter in between... for 20kW that would be the size of a small suitcase and for faster charging your are talking supercharger cabinet size.
University of Delaware is doing work with Vehicle to Grid (V2G) Technology using the batteries in EVs to help stabilize power demands. In addition, EV owners in Delaware can get paid up to $5000/year for being available to supply energy to the grid.
I did ask a Tesla rep about this once, and I was told that the Model S inverter was designed to work in one direction, so no, it doesn't support V2G technology nor will you be able to charge one car with another.
I have a 4kw inverter with 12kWh lead acid AGM batteries for back up power for my home. It doesn't run everything, but it does run frig, freezer, many lights, well pump, propane water heater, and propane house heat. It makes the house very livable in a power failure.
With normal operation, it powers the house for 10 to 14 hours. With restricted water use, I have powered the house for 24 hours with it.
The Nissan Leaf has a 24kWh battery, so it could power my house for up to 48 hours. Much more than 5 minutes.
Gee, an 85kWh MS could power my house for up to a week! And there is a level 2 charging station 5 miles away. Run over there for a couple hours every other day and bring the electrons home.
I think it would be a really cool thing to have a high power 110/220 volt outlet in the MS. Portable power station!