Rivian needs to push V2H update

[mindstormsguy]

I don't think it would require an inverter but would require some way to throttle the DC voltage from the donor car to the receiver car. This could be done at either end. If it's on the receiver car, the existing circuits which manage DC charging from a charging station could be used.

Not technically an inverter, but similar-ish looking power electronics. I’m reasonably confident that the two large contacts on the L3 plug are basically just routed straight to the battery. There’s a contactor in line for protection, but no power electronics.

When charging from a DCFC station, it’s the station that handles controlling the voltage / current, based on requests from the car. Charging logic is on the car side, but power control is done on the station side.

I’m not sure how V2V is supposed to work, but something is going to have to provide that power control hardware that the vehicle doesn’t typically need.

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[docwhiz]

Not technically an inverter, but similar-ish looking power electronics. I’m reasonably confident that the two large contacts on the L3 plug are basically just routed straight to the battery. There’s a contactor in line for protection, but no power electronics.

When charging from a DCFC station, it’s the station that handles controlling the voltage / current, based on requests from the car. Charging logic is on the car side, but power control is done on the station side.

I’m not sure how V2V is supposed to work, but something is going to have to provide that power control hardware that the vehicle doesn’t typically need.

The vehicle needs to control the DC voltage coming into the battery. The DC could be coming from a L3 charge station or another vehicle battery.

 

[mindstormsguy]

The vehicle needs to control the DC voltage coming into the battery. The DC could be coming from a L3 charge station or another vehicle battery.

For V2V maybe?

For normal L3 charging, no.

 

[docwhiz]

For V2V maybe?

For normal L3 charging, no.

Are you saying that the vehicle doesn't control the power coming into it from a DC charger?

 

[Tony R1S]

For V2V maybe?

For normal L3 charging, no.

Okay, yeah makes sense that something in between needs to regulate (whether buck or boost) the voltage to match the sink (receiving side). I guess it's kind of like a solar charge controller where the 'solar' input side is the donor car. But it seems some boost or charge pump is needed if the donor side has lower voltage than the receiving side. Seems complex :/

 

[mindstormsguy]

Are you saying that the vehicle doesn't control the power coming into it from a DC charger?

It depends what you mean by control. The vehicle does *dictate* what power comes to it from the L3 EVSE, but it relies on the EVSE to do what it asks. This is different than L2, where the charger is actually on the vehicle.

 

[Stepan]

btw, AC V2H/V2G standard J3068/2, was adopted in Jan 2024: https://cleantechnica.com/2024/02/22/sae-adopts-new-standards-for-vehicle-to-grid/
It does appear to only cover Type 2 (EU) connector and is meant for commercial application, which is a big bummer.

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