MME Charging Curve Data Collection

[ClaudeMach-E]

I think the 45 minutes should be an easy number to hit on a daily basis. Optimal speeds will be faster.

I'm not sure you want to charge at DCFC station on a daily basis.

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[ajmartineau]

Not literally daily... regular basis... every time you try without worrying about heating up the battery first or outside temp... not hitting it will be an anomaly. I rarely DCFC my Bolt and have never DCFC my B250e.

 

[dbsb3233]

Darren Palmer said in the Performance & Charging webinar that the MME does 20% to 80% in 38 minutes. Presumably, that's the ER since the SR is listed at 10% to 80% in the same time.

I think he just misspoke off the top of his head in that video when he said "20%" (really meaning 10%). 38 minutes being the SR 10-80 published time (45 ER).

 

[silverelan]

I think he just misspoke off the top of his head in that video when he said "20%" (really meaning 10%). 38 minutes being the SR 10-80 published time (45 ER).

Possible, but I'm not convinced. We'll find out next month.

 

[silverelan]

In terms of on-road performance, the MME Premium AWD ER seems to be a direct matchup to the Model Y non-Performance but in terms of charging, the MME's announced specs seem on par with a 2017-2019 Tesla 90D or 100D.

 

[ChasingCoral]

Collecting video's and photographs will allow us to build (an estimate of) the optimal charging curve for the Mach-E (in real-world conditions).
Post them here. Keep debates on other threads, please.

Just a reminder of this request. Plenty of other threads for discussion.

 

[ajmartineau]

12-15 charging summary. Cold day, warm battery 150kWh EA charger.

time	kWh Del.	kWh chrg	Batt. %	~miles add
0	0	0	43	0 (3*kWh del)
5	9	8.8	53	26.4
10	17	16.7	62	50.1
15	24	22.8	69	68.4
20	32	29.9	77	89.7

All numbers are estimates from the DCFC chargers screen.
Credit Tom Moloughney

See the first post in this thread for the complete curve of all sessions.

 

[silverelan]

@ajmartineau thanks for the edits and keeping this thread alive + focused. Hopefully @OutofSpecKyle will be able to keep us updated.

 

[dbsb3233]

Interesting passage from one new article...

https://chargedevs.com/newswire/2021-ford-mustang-mach-e-first-drive-report/

The Mach-E is set up to charge at 160 kW for the first 4 or 5 minutes, according to Ford EV global director Darren Palmer. Then it ramps down to about 110 kW and runs to 80 percent state of charge from there. We observed the 160-kW rate on one of our three charges, starting at 14% battery capacity. It took just 39 minutes to get from there to 80%, at which point the fast-charging rate slammed down to a grindingly slow 14 kW and we quit.

On the second EA charge, we saw a consistent 100 to 110 kW to the same point. The third wouldn’t get beyond 54 kW, and Ford is looking at its charge data to find out why (we’ll update the article if we get a definitive answer).

160 came out of the blue. We've been seeing/hearing 150 all along. But even some of the reviewer drives are reporting ~163. Except for them it was just for like the first 1-2 minutes. Palmer saying 4-5 minutes is interesting. If true in the production models, that would be about 13 kWh (~40 miles) in the first 5 minutes.

 

[silverelan]

If it really does plummet to 14kW at 80%, they really want owners to GTFO of the station. Not subtle in the slightest.

 

[balthisar]

The Mach-E is set up to charge at 160 kW for the first 4 or 5 minutes, according to Ford EV global director Darren Palmer. Then it ramps down to about 110 kW and runs to 80 percent state of charge from there.

So if we roll into a charger with, say, 10% state of charge, can we game the algorithm by disconnecting and reconnecting in order to maintain the 160 kW charge rate? Not sure if this rate is regulated by thermal monitoring (can't game a temperature reading), or is just a software limitation.

 

[dbsb3233]

So if we roll into a charger with, say, 10% state of charge, can we game the algorithm by disconnecting and reconnecting in order to maintain the 160 kW charge rate? Not sure if this rate is regulated by thermal monitoring (can't game a temperature reading), or is just a software limitation.

I does kinda read that way (just disconnect and reconnect). But surely it doesn't actually work that way.

I assume your last sentence is probably correct, that it goes by active thermal monitoring and other dynamic data rather than having a static curve profile. That's evidenced by the two charge clips we saw this week -- one showed 163 kW for 1-2 minutes starting at 7%, the other doing the same starting at 37%.

Granted, two videos of preproduction cars that probably don't have the final software in them should be taken with a grain of salt. But so far, the clues suggest just 1-2 minutes of high power when first plugging in before dropping and spending most of the time in the 80-110 kW area. (With a near shut-off when it hits the 80% mark).

I doubt it stays that way. Both the 1-2 minute time @160 and the excessive plummet at 80% scream "being overly cautious while collecting test data" to me.

 

[ajmartineau]

Collecting video's and photographs will allow us to build (an estimate of) the optimal charging curve for the Mach-E (in real-world conditions).
Post them here. Keep debates on other threads, please.

Date	Speed	SoC	Temp.	charger max	battery size
6- 2020	81 kW	61%	warm	unknown	88kWh
11-2020	121 kW	42%	unknown	unknown	88kWh

Keep debates on other threads, please.

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