Charging from Tesla to Tesla (Vehicle to Vehicle - V2V)

[Ed1]

Just saw this post and have some questions:

Cybertruck helps charge a Model Y

I think it's great that a Cybertruck can serve as a mobile charger to rescue vehicles with a dead battery.

Will the Powershare/bidirectional charging ability of a Cybertruck allow a simple cable from charging port to charging port? Thus avoiding the inefficiency of DC-AC-DC conversion.

This is the only helpful article I found which is a bit dated.
Tesla releases Powershare bidirectional charging – on Cybertruck only, so far

Apologies if this has already been discussed here. Thanks.

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[mongo]

Just saw this post and have some questions:

Cybertruck helps charge a Model Y

I think it's great that a Cybertruck can serve as a mobile charger to rescue vehicles with a dead battery.

Will the Powershare/bidirectional charging ability of a Cybertruck allow a simple cable from charging port to charging port? Thus avoiding the inefficiency of DC-AC-DC conversion.

This is the only helpful article I found which is a bit dated.
Tesla releases Powershare bidirectional charging – on Cybertruck only, so far

Apologies if this has already been discussed here. Thanks.

Not directly, Powershare is AC output and DC-DC pack to pack would require a 10kW buck/boost converter.

One could plug a Mobile Connector into a Powershare Mobile Connector (once Tesla releases outlet adapters) for port to port charging though.

 

[Woodrick]

Just saw this post and have some questions:

Cybertruck helps charge a Model Y

I think it's great that a Cybertruck can serve as a mobile charger to rescue vehicles with a dead battery.

Will the Powershare/bidirectional charging ability of a Cybertruck allow a simple cable from charging port to charging port? Thus avoiding the inefficiency of DC-AC-DC conversion.

This is the only helpful article I found which is a bit dated.
Tesla releases Powershare bidirectional charging – on Cybertruck only, so far

Apologies if this has already been discussed here. Thanks.

It is a simple cable that comes with all of the Foundation Series and was included in many of the cars. It's the Mobile Connector. It plugs into the NEMA 14-50 connector in the bed.

No way are you going to get away from DC-AC-DC conversions. Hooking a charged 400V system to an uncharged one is quite eventful.

The inverters are relatively efficient though. I think over 97%.

 

[Ivessm]

Yes what Woodrick said.

You plug your mobile connector into the NEMA 14-50 receptionist in the bed of the vault then plug the Tesla NACS plug into the car and your charging. Don't forget to turn on the 14-50 in the bed of the CT.

Good luck.

 

[mongo]

OP's question:

Will the Powershare/bidirectional charging ability of a Cybertruck allow a simple cable from charging port to charging port?

No, it likely won't. Though technically, it could if the Cybertruck's isolation test is sufficient for GFCI protection and the Pilot&Control pin can act as an EVSE.

Thus avoiding the inefficiency of DC-AC-DC conversion.

Still would be DC-AC-DC though.

 

[Ed1]

Yes what Woodrick said.

You plug your mobile connector into the NEMA 14-50 receptionist in the bed of the vault then plug the Tesla NACS plug into the car and your charging. Don't forget to turn on the 14-50 in the bed of the CT.

Good luck.

Right. my question is whether it’s possible to directly plug from charging port to charging port and get Level 3 supercharger speeds from the Cybertruck to a stranded Tesla. If not, what would it take?

if the CT allows bidirectional charging and can receive supercharging, why not in reverse?

 

[mongo]

Right. my question is whether it’s possible to directly plug from charging port to charging port and get Level 3 supercharger speeds from the Cybertruck to a stranded Tesla. If not, what would it take?

if the CT allows bidirectional charging and can receive supercharging, why not in reverse?

The bidirectional is AC though with 11.5kW max.
Supercharging is a direct DC connection to the pack that is only regulated by the cabinet.

Directly connecting two identical packs with different charge levels results in an uncontrolled current. Connecting pack of different nominal voltages is an even worse configuration.

 

[Ed1]

The bidirectional is AC though with 11.5kW max.
Supercharging is a direct DC connection to the pack that is only regulated by the cabinet.

Directly connecting two identical packs with different charge levels results in an uncontrolled current. Connecting pack of different nominal voltages is an even worse configuration.

I was under the impression that all lines just supply DC and the cars themselves regulate the current that the batteries take in. For example you can adjust the amperage/charge rate on screen during supercharging. Are you saying that the supercharger is regulating this process?

Should be trivial to implement direct DC to DC charging. If you can receive DC, you should be able to send DC with slight modification. No?

 

[mongo]

I was under the impression that all lines just supply DC and the cars themselves regulate the current that the batteries take in. For example you can adjust the amperage/charge rate on screen during supercharging. Are you saying that the supercharger is regulating this process?

Should be trivial to implement direct DC to DC charging. If you can receive DC, you should be able to send DC with slight modification. No?

During Supercharging you only control the target SOC. The vehicle tells the cabinet the maximum current to provide and the cabinet source up to that amount. The vehicle side is basically a direct connection from charge port to battery pack.

During Level 1/2 charging, the EVSE tells the vehicle the maximum current it can provide. The UI allows you to choose a value lower than that and the vehicle's charger uses that as a control limit.

 

[mongo]

It is possible that the power conversion system could output 240V DC instead of AC, depending on circuit topology, and the charging vehicle might be able to use that. Could provide a slight efficiency boost by reducing peak current and associated losses.

 

[Ed1]

No way are you going to get away from DC-AC-DC conversions. Hooking a charged 400V system to an uncharged one is quite eventful.

How is hooking an uncharged Tesla to a charged 400V Cybertruck any different than connecting to a 480V Supercharger? (Assuming that the car itself is controlling the charge rate as indicated by the onscreen charge/amp limiter.)

Supercharger Amp/Voltage

 

[Ed1]

During Supercharging you only control the target SOC. The vehicle tells the cabinet the maximum current to provide and the cabinet source up to that amount. The vehicle side is basically a direct connection from charge port to battery pack.

During Level 1/2 charging, the EVSE tells the vehicle the maximum current it can provide. The UI allows you to choose a value lower than that and the vehicle's charger uses that as a control limit.

Thanks for explanation. Do you think it would be easy to modify the Cybertruck to do the same? Is the hardware already there and is it just a matter of software upgrade?

 

[mongo]

Thanks for explanation. Do you think it would be easy to modify the Cybertruck to do the same? Is the hardware already there and is it just a matter of software upgrade?

Wait, modify the the Cybertruck to do the same as what? To act like a Supercharger or EVSE?
If they didn't plan for that, it would probably be difficult.

 

[carsly]

Have any of you seen the size of the equipment at a Supercharger? I'm not just talking about the dispenser, that's the easy part. I'm talking about the stuff locked up behind gates. Do you want to haul all that in your bed along with some kind of dispenser?

 

[mongo]

Have any of you seen the size of the equipment at a Supercharger? I'm not just talking about the dispenser, that's the easy part. I'm talking about the stuff locked up behind gates. Do you want to haul all that in your bed along with some kind of dispenser?

Did you know the first superchargers just used multiple Model S charger units?
V3 cabinets handle four posts plus deal with incoming three phase AC and include cooling. The high power DC-DC conversion doesn't really take much space/weight.

https://teslatap.com/articles/supercharger-superguide/

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