Welcome to Tesla Motors Club
Discuss Tesla's Model S, Model 3, Model X, Model Y, Cybertruck, Roadster and More.

IDEA: Car share vehicles as battery buffer at QC locations


Aug 20, 2006
Some QC locations (like Supercharging parking lots) have issues with enough power for all vehicles to charge at full rate at the same time.
Some QC locations suffer high power demand charges for those times when many cars are charging at full rate at the same time.

On idea for a solution would be to make QC locations as parking lots for car share cars to be dropped off. You leave them sitting in the spot, plugged in, and the car will sit until it gets rented later. The benefit is that with V2G technology, you could make that car be a battery buffer for other "just passing through vehicles" to charge from instead of from the grid. Then the charging station can "trickle charge" the car share vehicle back to full when the lot is being less used.

This could solve multiple problems, including where to leave car share cars when not in use. Having dedicated spots just for that is wasteful since those cars are sitting doing nothing until they get rented. Having shared "buffering" / "charging" stalls seems like it could help with some of these concerns. Getting coordinated V2G working would need to get done first though.

Another benefit is the car share cars could be swapped on a road trip. You drop off your almost empty, and just hop in a full one and carry on your trip.


Oct 6, 2013
San Diego, California
Seems like a good idea - however, there would have to be a way for a fully charged vehicle to be moved out of the way, to allow others to charge - if I left my vehicle and went on my way with a car-share vehicle - how does my car get unplugged when ready?


Aug 20, 2006
It would be left there full. Those car share vehicles need to be left somewhere. I am saying it is best left plugged in and ready (in 'standby mode') to be used as an on-demand battery buffer when another vehicle pulls up next to it. Sure, it burns up a precious parking stall with charging station, but I think it would be worth it. Another benefit is you could do "pack to pack" dump at perhaps even quicker than Supercharger rates. You aren't limited by the grid anymore.

I suppose once all the self driving stuff is worked out, the car could unplug itself when full, move itself to the "storage lot", and then quickly drive back to the bay if the system decided it was a good time to put that battery pack back online again.

- - - Updated - - -

Also, when I say "car share", I mean any vehicle that isn't left at someones home garage when not in use.
So, that could include things like future Uber self driving cars. Sort of taxi-on-demand type vehicles.
If their "depot" was the supercharging lots, then they could be used as temporary battery buffers for other vehicles passing through.

I think Tesla plans to put powerwall type systems at many supercharging lots, but this could be a cheaper alternative. Also, the pack is portable, so the pack could be driven to a shop if it needed maintenance, upgrades, etc.
Last edited:

Products we're discussing on TMC...

About Us

Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.

Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.