Charging capacities

[bruintoo]

To those that are able to gauge your charging levels (either using your own charger or public charging stations), what is the maximum amount of charge in kWh have you been able to put in your e-tron when the estimated range goes to zero? I have only been able to charge anywhere between 6.5 to 6.9 kWh using the ChargePoint station at work. I thought useable capacity for the battery is 7.7 kWh out of total 8.8 kWh?

 

[pjanisch]

To those that are able to gauge your charging levels (either using your own charger or public charging stations), what is the maximum amount of charge in kWh have you been able to put in your e-tron when the estimated range goes to zero? I have only been able to charge anywhere between 6.5 to 6.9 kWh using the ChargePoint station at work. I thought useable capacity for the battery is 7.7 kWh out of total 8.8 kWh?

In the US, the usable capacity is 6.0kWh; I think this is due to the difference in US emissions. You're seeing 6.5 - 6.9 kWh due to ~10% efficiency lost due to charging or pre-conditioning.

 

[bruintoo]

I found this from Audi's Online Magazine: http://audi-encounter.com/magazine/tech ... e-volt-age

The lithium-ion battery in the Audi A3 Sportback e-tron stores 8.8 kWh of energy, of which 6.2 kWh, i.e. more than 70 percent, are available for use. Depending on the charge condition, it has a tension of between 280 and 390 volts. The battery consists of 96 prismatic cells grouped into eight modules of twelve cells each. Including the electronic components – the battery management controller and the battery junction box – the battery system weighs 125 kilograms. The lower part of its casing is made from pressure die-cast aluminum, the upper part from polymer.

 

[pkulak]

I'd pay some real money to chat with an Audi engineer about why they open up 1 kWh less of the battery in NA. Part of me wonders if they noticed higher-than-expected degradation in Europe.

 

[pkulak]

I found this from Audi's Online Magazine: http://audi-encounter.com/magazine/tech ... e-volt-age

The lithium-ion battery in the Audi A3 Sportback e-tron stores 8.8 kWh of energy, of which 6.2 kWh, i.e. more than 70 percent, are available for use. Depending on the charge condition, it has a tension of between 280 and 390 volts. The battery consists of 96 prismatic cells grouped into eight modules of twelve cells each. Including the electronic components – the battery management controller and the battery junction box – the battery system weighs 125 kilograms. The lower part of its casing is made from pressure die-cast aluminum, the upper part from polymer.

Wow! That's some of the best info on the car I've seen.

> gasoline-driven stationary heating unit

What the hell is that? haha. I've never heard of that in a car. Basically, a gas-powered heater in there somewhere? Seems like a great idea. Probably a lot more efficient at creating heat than turning the engine on. And likely far better than blowing through the entire battery by heating a coil. If it's what it sounds like it is.

> the electric motor, which maintains its maximum torque of 330 Nm in a constant stream virtually from start all the way to around 2,200 rpm

That's as fast as the motor turns? No wonder it's behind a 6-speed tranny!

 

[dr61]

> the electric motor, which maintains its maximum torque of 330 Nm in a constant stream virtually from start all the way to around 2,200 rpm

That's as fast as the motor turns? No wonder it's behind a 6-speed tranny!

What I think they are saying is that electric motor torque is about 330 Nm in the 0-2200 rpm range, then at higher rpm torque gradually decreases.

 

[jerry3561]

Auxiliary heating systems for cars are quite common in cold countries. I believe Audi specifies one as an option for the e-tron in some markets.
For more information on how they work, check out the Webasto company's products

 

[rickbessex]

To those that are able to gauge your charging levels (either using your own charger or public charging stations), what is the maximum amount of charge in kWh have you been able to put in your e-tron when the estimated range goes to zero? I have only been able to charge anywhere between 6.5 to 6.9 kWh using the ChargePoint station at work. I thought useable capacity for the battery is 7.7 kWh out of total 8.8 kWh?

You would think somebody here would have used a charge system that discloses the kilowatt per hour. But the car maximum is 3.6 kW per hour no matter what fast charge system you find.

A friend’s Hyundai phev discloses, on the dash, the charge rate. At my home. 240 V 15A 6-15R, I can get 2.3 kW per hour on their plug-in charger

Audi: A self study guide on a 2016 A3 EtRon indicates it has a usable battery of 7.0kw. I have seen other folks talk about the usable portion being somewhat less and it depends perhaps where you are on the globe.

My owner’s manual matrix advises the amount of time it takes to charge full depending on the socket used and the strength in amps and of the amount of volts.

Looks like the Audi home charger maxs out at 16 A 240 V and that should probably push it to the cars maximum charge rate of around 3.7. Further, if you were to find a stronger /faster industrial charging location, I’m sure the 16 amp to 240v home charger matches the max and thus 3.6 kW per hour max rate. so I’m guessing that the 7.0kw ur able portion of battery divided by 3.7kw/h is the amount of time it takes to charge from empty 1.9hrs.

For my home, I realize to go from 2.3kw/h to max of 3.7, I’ll have to change from a 15amp/240 v flow to a 16amp/240v flow. And for me, I will have to install a higher amperage breaker, wiring, plug, etc.. I don’t think the cost of the upgrade to save an hour in charge time is worth doing.

 

[rickbessex]

 

[Jacks A3 ET]

Rick - thanks for sharing this. Interesting to see the Last Comment ...
"The state of charge is maintained at between 25% and 85%.".
This confirms what is often discussed in EV conversations - as the safe charge levels to support a long life and battery health. Might say it is another 80/20 rule for EV's.
Using my OBD Eleven my battery when "fully" charged (range 24 miles) shows the Full Battery voltage at 365 volts and each individual cell at 3.8 - 3,9 volts. I have a dedicated 240 volt circuit in the Garage with the Audi Charger connected. From Empty to full charging takes about 2.5 hours. Varies with how cold it is as this is an unheated garage in Seattle.