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Discussion Starter #1
Hi All-

I have noticed this trend, our e-Tron does not use the full capacity of an L1 or L2 charger (no matter what level of charge is remaining, so it is not throttling due to "almost being charged"). Has anyone else seen this?


Here is what I see:

Charger Rated As delivered to e-Tron
BMW I 1.2KWh 0.8KWh
Audi e-Tron 9.2KWh 8.8KWh
Clipper Creek. 6.6KWh. 5.5KWh
ChargePoint. 6.6KWh. 5.5KWh


L3 Chargers work no problem, I can get the full 150KWh until it approaches capacity.

Anyone else see this on their vehicle?
 

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E-Tron SUV charging issues have shown similarities to the A3 E-Tron from what I read so far. So you might have luck finding an answer their.

Good luck.
 

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I self-installed a 14-50 in my garage, and noticed that the Audi will only pull 8.8 kW from it (4.4 kW when set to 50%, which I almost always have it set to). This would correspond to 40A @ 220V. I haven't thrown a meter on the outlet to see if I'm getting a higher voltage there. That would indicate the Audi charger throttles it down a little bit.


Overall the rates you're seeing aren't throttled TOO low. I'm sure over the life of the car it would preserve the battery life some.
 

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Hi All-

I have noticed this trend, our e-Tron does not use the full capacity of an L1 or L2 charger (no matter what level of charge is remaining, so it is not throttling due to "almost being charged"). Has anyone else seen this?


Here is what I see:

Charger Rated As delivered to e-Tron
BMW I 1.2KWh 0.8KWh
Audi e-Tron 9.2KWh 8.8KWh
Clipper Creek. 6.6KWh. 5.5KWh
ChargePoint. 6.6KWh. 5.5KWh


L3 Chargers work no problem, I can get the full 150KWh until it approaches capacity.

Anyone else see this on their vehicle?
I am noticing the same thing. Did you
Chargepoint 6.6KWh -> 5.4KWh
Audi charger 9.2KWh -> 8.8 KWh (13 miles per hour only) Other cars in my office get ~20 miles plus per hour.
EVgo 7.2KWh -> 6.6KWh

Did you reach out to Audi about it?
 

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I suspect that the difference in the numbers everyone is seeing is related to the charging process not being 100% efficient. The EVSE is rated according to how much power it draws from the grid, while the car is reporting how much energy is being delivered to the battery. The charging system of the car has losses. Any heat generated anywhere in the charging process and any energy expended managing that heat are all losses.
When thinking in term of mikes of range per hour, also keep in mind that most EVs travel farther on a kWh than the e-tron does
 

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Discussion Starter #7
I suspect that the difference in the numbers everyone is seeing is related to the charging process not being 100% efficient. The EVSE is rated according to how much power it draws from the grid, while the car is reporting how much energy is being delivered to the battery. The charging system of the car has losses. Any heat generated anywhere in the charging process and any energy expended managing that heat are all losses.
When thinking in term of mikes of range per hour, also keep in mind that most EVs travel farther on a kWh than the e-tron does
That's not true. I have had other EVs and they gladly pull the ENTIRE rated capacity from these (SAME) chargers. The Audi is negotiating a lower rate for some insane reason and I think we shoull all be a bit more ticked off about it. Quite frankly when you are not in an area rich with CCS stations 50+kW, this discrepancy can cost you hours.
 

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Discussion Starter #8
Just as a follow up, I have asked audi support (phone #/email) and our local dealer. No real response from support line other than ask your dealer and the dealer said, Works as Designed. This is BS. The charger should be accepting the rated energy as measured at the cable (e.g., for ChargePoint 6.6kW ) and the Audi should receive it, not down rate it. Given the car can take 8.8kW from the included Pod, there is no rational explanation for taking an 15+% cut in energy from an L2 charger.

(/Soapbox due to trying to plan a trip into Eastern Washington where there are NO L3 chargers, just L2, so when you are talking 10+ hours to charge, losing 15% is a bad deal. And a REALLY BAD customer experience.
 

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trying to plan a trip into Eastern Washington where there are NO L3 chargers, just L2.
I am in Western WA - you must be getting away from I-90, as there are several good 150kW stops between Seattle and Spokane. Good luck on your trip!
 

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Discussion Starter #10
I am in Western WA - you must be getting away from I-90, as there are several good 150kW stops between Seattle and Spokane. Good luck on your trip!
Trying to get to a Wedding in Twisp. the only CCS is at a Chevy dealer in Chelan and its 24kW (so not great). I found some 80-100A L2 units at some state parks on Rt 2 and I think I can make it back to the Ellensburg L3 EA station if I make a stop in Chelan (Chevy or it seems they have lots of L2s in some of the local medical facility parking lots that are free to access). But I am worried about getting enough juice (only one J1772 at the hotel we are staying in) prior to leaving (since when we arrive we'll be at about 30% if we are lucky.
 

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Discussion Starter #12
As a follow up, I did call Audi eTron support today to lodge this as an issue. The gal there said she would be sure to review this with their management and she did agree that unless we as owners call to their support, they really have next to no visibility of issues. I think the common practice of auto dealership service folks writing things off as Works as Designed is still the case despite Audi trying to make the eTron different from the rest of their line up. So, I would encourage you all to call or email them (email: [email protected], phone +18008222834 and follow the prompts to get to the etron reservation and support).
 

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Still I am convinced that the difference between the 9.2 kW and 8.8 kW is due to the losses in the AC=>DC conversion. The car indicaties the power (8,8 kW) going into the battery (DC) and the rating on the charger is the AC-power (actually it is the current that is limited to a maximum value and by multiplying with a nominal voltage, you get the maximum power). On many public chargers in Europe the current is limited to 16A of 19A. In Europe the e-tron has a three phases 16A on board charger. that corresponds to 11 kW and still the power indicatet by the car is only 10.1kW. Losses in the conversion.
 
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