Charging In Hot Sun

[miasm]

Pulled into a 350kW charger this afternoon with 18% charge.

Hooked up, and it ramped straight to 210kW.

At about 35% charge, the big fans kicked on, and the charge started tapering down with a warning message about the battery being too hot (was sitting idle before the 5 mile drive to the charger)...fairly quickly going down to 101kW before slowly recovering some speed.

This was at 5300' so thin air, direct sun, 80+F, black truck, full AC on to keep me marginally cool while charging.

Me thinks Rivian needs to update their logic to take into account some extra parameters to kick those fans on a little earlier, because it seemed like steady state was closer to 150kW, but dropped all the way to 100kW before ever so slowly recovering. After the screenshot, it slowly climbed to 137kW before I ended the charge.

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[jerseyff]

Do you have the 2022.19.03 update? I know preconditioning is introduced in there for navigation that includes DC charge stops.

Not sure if they added some logic for unplanned (not using nav) DC charging and cooling before the temp hits the previous thresholds.

 

[MountainBikeDude]

Pulled into a 350kW charger this afternoon with 18% charge.

Hooked up, and it ramped straight to 210kW.

At about 35% charge, the big fans kicked on, and the charge started tapering down with a warning message about the battery being too hot (was sitting idle before the 5 mile drive to the charger)...fairly quickly going down to 101kW before slowly recovering some speed.

This was at 5300' so thin air, direct sun, 80+F, black truck, full AC on to keep me marginally cool while charging.

Me thinks Rivian needs to update their logic to take into account some extra parameters to kick those fans on a little earlier, because it seemed like steady state was closer to 150kW, but dropped all the way to 100kW before ever so slowly recovering. After the screenshot, it slowly climbed to 137kW before I ended the charge.

For whatever reason, running AC/Heater while charging impacts a vehicles ability to cool/warm itself. I don't know if its because it's utilizing some of those heating/cooling systems to assist in maintaining the vehicles thermals, or if its the added demand of the hvac on the systems during a charge.

Kyle from outofspec seems to turn off his hvac often when doing high rate charging and or trying to maintain a high curve.

 

[DaveA]

I had one EA charger last week show that the charging cable was too hot and it slowed charge. Guessing it was the direct sun on the cable maybe?... I ended charge and then just switched cables and went back to normal tapering/speeds.

 

[ajdelange]

For whatever reason, running AC/Heater while charging impacts a vehicles ability to cool/warm itself.

With respect to cooling: there is only one compressor. If it is being used to cool the battery during charging its whole capacity is not available for cooling the cabin.

 

[MountainBikeDude]

With respect to cooling: there is only one compressor. If it is being used to cool the battery during charging its whole capacity is not available for cooling the cabin.

Yeah, figured as much. Half the cooling rate for both

 

[ajdelange]

Half the cooling rate for both

Not necessarily half and half. Telsas are notorious for giving precedence to the battery when driving under heavy load in hot weather.

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