Charging loss

[Lsthrz]

I routinely see a ~10kW difference between what is reported by an EA charger and the Rivian app (EA higher). Is this loss or something else?

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[Craigins]

10% is the standard loss i believe. so that tracks.

 

[Mysta]

Losses, climate, etc

 

[manitou202]

Here is a great article explaining charging loses.

https://insideevs.com/news/550923/lucid-air-charging-losses-explained/

 

[Lsthrz]

Thanks, this one too from Car and Driver:

https://www.caranddriver.com/features/a36062942/evs-explained-charging-losses/

 

[SeaGeo]

Thanks, this one too from Car and Driver:

https://www.caranddriver.com/features/a36062942/evs-explained-charging-losses/

This article is wrong about DC fast charging efficiency. The way Tesla reports it is misleading. DCFC is not 99% efficient. It is going to be pretty sensitive to what overhead tasks the car is doing (like heating or cooling) and the current it's pushing.

 

[ajdelange]

I routinely see a ~10kW difference between what is reported by an EA charger and the Rivian app (EA higher). Is this loss or something else?

Several factors apply here. The discrepancy you see is probably due to how the energy is accounted for. The energy coming into the EA station arrives as AC. To be applied to your battery it must be converted to DC at a different voltage. These conversions are not 100% efficient. Thus if the vehicle displays energy delivered to the battery and the charger the mains energy delivered to it the latter is going to be a larger number by about 10%. I have no idea what EA's billing scheme is but I suppose it is only fair that they charge you for what shows up on their electric bill.

To complicate things further the energy delivered to your battery is not quite the same as the energy stored in your battery as some of the former gets converted to heat in the charging process.

In any case, yes, the discrepancy is losses.

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