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Why does it charge so slowly?

Well I’ve been a M3 LR owner for a year now and still learning! Getting to the point where I may change it while it’s got some decent value. Certainly a lot to learn about Tesla alternatives. However, for me, I do tend to plan journeys, so looking for maximum range with the shortest number/duration of stops. I’m not yet comfortable for a world without superchargers, but getting there. More to learn!
 

LoudMusic

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Jul 21, 2020
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Well I’ve been a M3 LR owner for a year now and still learning! Getting to the point where I may change it while it’s got some decent value. Certainly a lot to learn about Tesla alternatives. However, for me, I do tend to plan journeys, so looking for maximum range with the shortest number/duration of stops. I’m not yet comfortable for a world without superchargers, but getting there. More to learn!

I'm not sure if this is what you're talking about, but because of the charge curve on all EVs (e-tron included) it's actually faster to make more stops and arrive at the charger between 5 and 10%, then charge to only enough to reach your next charging location. That way you're always in the state of charge range where the battery accepts power the fastest.
 
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This is odd, given it's not comparing how quickly they charge in any meaningful way. If you're driving a distance you need an amount of range, not a percentage of battery. So charge them to the same remaining range and you're comparing meaningful charging. As others observed, the percentage is just different due to how much Audi chop off the top, to be able to say "look how quick ours charges at the top end" even though this makes the car worse for the end user as they have no option of trickle charging it higher for an extra hint of range at the start of a day of driving. On a side note, my speakers go up to 11...
 
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Yev000

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May 3, 2019
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Different charging curve. It actually charges slower in total. Especially if you are talking about how many actual miles you get per time charging....

 

GeorgeSymonds

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Mar 16, 2018
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This is odd, given it's not comparing how quickly they charge in any meaningful way. If you're driving a distance you need an amount of range, not a percentage of battery. So charge them to the same remaining range and you're comparing meaningful charging. As others observed, the percentage is just different due to how much Audi chop off the top, to be able to say "look how quick ours charges at the top end" even though this makes the car worse for the end user as they have no option of trickle charging it higher for an extra hint of range at the start of a day of driving. On a side note, my speakers go up to 11...
I actually see it as completely the opposite. The test is "drive a distance and how long does it take to get back to the state of charge when you started". Now sure the Model 3 could go further before a charge, but if you looked at it as how many miles of range can the etron add in a given time compared to the Model 3, the e-tron wins. If you can avoid the stop altogether in the model 3 and not in the e-tron then the Tesla has an advantage, but I still think its a valid test.

Not using the top part of the battery is also better for the battery so for me, the e-tron wins on that too.
 

GRiLLA

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Jul 5, 2020
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I dunno, you can look at this in multiple ways. I don't think Richard's video is misleading, it's a pretty normal behavior to charge to a target figure.

If I model a long journey in ABRP from London to Glasgow, a Model 3 LR ends up about 30mins faster than an Etron 55 Quattro, pretty irrespective of what level of charge I want to end with. That's far closer than I guess I was expecting, Ionity and other 150KW chargers certainly are making a big difference.
 
Different charging curve. It actually charges slower in total. Especially if you are talking about how many actual miles you get per time charging....

A very interesting read. Thanks for posting. It’s almost like VAG have learnt nothing from Dieselgate
 
I actually see it as completely the opposite. The test is "drive a distance and how long does it take to get back to the state of charge when you started". Now sure the Model 3 could go further before a charge, but if you looked at it as how many miles of range can the etron add in a given time compared to the Model 3, the e-tron wins. If you can avoid the stop altogether in the model 3 and not in the e-tron then the Tesla has an advantage, but I still think its a valid test.

Not using the top part of the battery is also better for the battery so for me, the e-tron wins on that too.
Fair alternative viewpoint. For me, the reason I don't think this way is that if I'm fast-charging it is because I am on a journey - overnight or whenever is when I aim to return the car to pre-journey state of charge. However, others may only feel happy setting off on any given leg of a journey with x% charge or whatever.
I still wonder how well many people will do with EV charging in general - I see people on EV forums say things like "well obviously they'd exclude those slow chargers from their search filter on app xyz" but as a person with a wife who really, really doesn't care about any tech I don't see her doing that - so she may be the person who thinks charging takes 5 hours or whatever cause she used a trickle charger in the middle of a road trip.
 
One thing that was never mentioned on the video was battery precondtioning - obviously with the rules they've used preconditioning could be not an option here since the Tesla was not using a supercharger putting it at a disadvantage.
Would charging have been faster if preconditioning had been applied for that 51% to 90% charging session?
 
In the real world I'm not sure pre-conditioning buys much other than bragging rights to a high peak KW number for a few minutes. What you make in headline charging speed you lose in high energy consumption beforehand when it's pre-conditioning on the way. The rate it drains the battery in those 10 miles or so is alarming.
 

Yev000

Active Member
May 3, 2019
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Knaphill
In the real world I'm not sure pre-conditioning buys much other than bragging rights to a high peak KW number for a few minutes. What you make in headline charging speed you lose in high energy consumption beforehand when it's pre-conditioning on the way. The rate it drains the battery in those 10 miles or so is alarming.
Heavily depends on the conditions. In the summer with battery temp at 30C, very little time saved by going to 50C for peak charging/performance. in the Winter with 10C, you get a big difference with preconditioning - assuming you start early enough.

This is especially true of heatpump cars because the heatpump keeps the battery cold (less waste heat) during winter. To the point where the performance model will go into limp mode if it's -10C outside and you are nearing 10% - although I'm sure it will (if not already) be fixed by software. Bjorn did a few videos demonstrating this in Norway.

Basically at around 45C you have peak charging/performance in the battery - how many KW it can produce or take. If you are below that by a meaningful amount you will not charge as fast. I live about 3 min from a supercharger. If I go into a cold car (e.g. 5C) and drive to a supercharger with 20-30% to top up I'll get 45KW.... If I preheat for ~30 min before I go I'll get the max.

Before you ask, I live in a flat right now so cant charge at home....
 

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