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Real world charging profile

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Real world charging profile

 
Old 04-10-2019, 06:09 PM
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Default Real world charging profile

Up until now we've only seen pre-production engineering test charging sessions that showed 150+kw peak charging with tapering after 80%. This nextmove article and associated video shows a fast but different real-world charging profile on an Ionity charger that peaks at 145kw and tapers at 50%. An 80% charge would have taken ~27min on the original pre-production profile and would take 32min using this recent charge profile. There are lots of variables we could speculate about but this seems like a real-world test. It will be interesting to see how the Electrify America chargers with production e-tron BMS firmware responds.

nextmove.de

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Old 04-10-2019, 10:57 PM
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Hey now, that's not good. Where'd my 150 to 80% go?
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Old 04-11-2019, 04:54 AM
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@alexlear, thanks, good video.

There is a video for driving e-tron at 200km/h (125 mile/h) on the German autobahn:

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Old 04-11-2019, 04:41 PM
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Damn good charging performance. Came off the blocks really strong from a "dead" battery. 20-80% in 24 minutes. 10-100% is a respectable 43 minutes (that's where I'll be living given the range and charging situation). Hopefully, both these numbers would be better without taking the battery to an unrealistic 0% before charging. Charging is the one true highlight in the e-tron's less than stellar EV resume.

That being said, I still hope this is a single less than optimal instance with the Ionity charger and not Audi recontouring the charge performance. Audi can't afford to pull back the specs, even a little. They continue to promise 150kW charging, and I don't see that achieved in this case. Initial testing showed negligible taper out to 80%, also not achieved in this case. More data will come along.

Rewatching the video, is it possible that the heat buildup charging from zero limited the max rate and led to the early taper?

Last edited by LavaGrau_A3; 04-11-2019 at 05:00 PM.
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Old 04-13-2019, 09:52 PM
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alexlear,

Curious as to how a 200 kph Autobahn run would affect charging performance. It appears as though the charge video took place immediately following the high speed run which ended near Magdeburg. I'm no detective, but the trip meter in the charge video shows 59.3 kWh/100 km, that is the Ionity charger near Magdeburg, car finished the high speed run at 0%, and driver is wearing the same sweater. I know, the sweater thing is a stretch.

I assume a high speed run like that would build heat in the pack. No? Would the charging curve be influenced by an unusually fast drive like that and how?

Thanks.

Last edited by LavaGrau_A3; 04-13-2019 at 10:01 PM.
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Old 04-14-2019, 03:52 AM
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Extremes in heat or cold will affect charge rate. I've also seen videos of Models 3s charging. If they fall to a SOC of less than 10%, initial charge rates are slower until SOC is >10%, then it ramps up. Don't know how that applies to Audi. It would appear fastest charge rates occur between 10-80% SOC.
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Old 04-14-2019, 09:41 AM
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Originally Posted by LavaGrau_A3 View Post
alexlear,

Curious as to how a 200 kph Autobahn run would affect charging performance. It appears as though the charge video took place immediately following the high speed run which ended near Magdeburg. I'm no detective, but the trip meter in the charge video shows 59.3 kWh/100 km, that is the Ionity charger near Magdeburg, car finished the high speed run at 0%, and driver is wearing the same sweater. I know, the sweater thing is a stretch.

I assume a high speed run like that would build heat in the pack. No? Would the charging curve be influenced by an unusually fast drive like that and how?

Thanks.
I noticed the the same things you did, high consumption indicating it was right after the high speed run in the other video. You're 100% right about the heat buildup affecting the charge rate. I think we'll need more data points and a few EA charges here in the US. Overall - Great charging speed even after a serious battery workout!
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Old 04-14-2019, 06:45 PM
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Thanks for your input. I agree, top tier charging performance.
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Old 04-21-2019, 12:05 PM
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Here's another charge curve example on 350kw Ionity charger. This one starts (at 8% SoC) a bit slower but ultimately peaks faster and ends (at 90% SoC) faster.





Once again, a very good charge curve.


Data from this video:


Last edited by alexlear; 04-21-2019 at 02:26 PM. Reason: Updated plot with data point at 79% to better show start of taper
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Old 04-21-2019, 02:12 PM
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Thanks for posting. I would have liked to see it go all the way to 100%, but great performance. I'm starting to think the charge curve in the NextMove video was indeed influenced by the 200 km/h speed run. Here the initial loading is almost identical at 110 kW, but we do get to 150 kW + and carry that all the way to 79%. In the comments the video's author remarks on a lack of cooling noise compared to Tesla. The fans were working pretty hard in the NextMove video.
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