V2V DC charging

[nihtwar]

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[CyberGus]

To charge a battery, the input voltage must exceed the battery voltage.

It seems to me that if you charge a battery with another battery, they will simply stop at equilibrium, when both reach the same SoC.

 

[JBee]

Let alone you'd blow something up in the process if you couldn't limit amp flow.
My understanding is that the Supercharger handles all of this when DC charging, with the vehicle only providing telemetry back to the supercharger to set the correct values.

In saying that it would be nice to have DC to DC V2V charging, but that is only likely through some sort of switching DC converter to maintain the right voltage and current levels. Battery direct to battery without anything regulating it in between, is a event you won't to avoid at all costs, unless both a balanced, at which point there will also be no charge going from one to another either. There simply needs to be some sort of "potential adjustment" to make this work. A motor controller with motor can be used to make this work and certain vehicles use this technic, but I haven't seen a V2V DC/DC version of it yet.

 

[Crissa]

To charge a battery, the input voltage must exceed the battery voltage.

It seems to me that if you charge a battery with another battery, they will simply stop at equilibrium, when both reach the same SoC.

Well... not exactly, since you also need to get over internal resistance.

Generally you'd have a device like a buck converter to raise the voltage and send it in a specific direction and speed that you'd control.

Regardless, Tesla does not currently give you access to the DC. You have to manufacture your own.

-Crissa

 

[Woodrick]

I know the new NACS standard includes male to male connection capability. The intent is level 2 urban charging where cable management is too difficult to maintain. They do this with J-plugs in Europe now.

So, with this in mind, could Tesla add V2V charging with such cables, instead of the AC ports? And taking it a step further, could they eliminate the inverter at each end and directly use DC.

Such a solution should be much more efficient and possibly quicker.

There have been a few possible indications of some sort of fancier V2V PowerShare cord. Some of the videos have briefly shown something that alluded to the solution.

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