MME Charging Curve Data Collection

malba2366

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This is what other tests have shown too. It only charges at max speed (150 kWh) for a few minutes then progressively throttles down to 80 -90 kwh until 80% where it hits a wall.

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ajmartineau

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When I compare the 1st charging session to the rest, it was obviously cold. So it looks like the other sessions throttled because of heat. Notice how both graphs show it holding a higher amperage deeper into the pack. We need Torque Pro to pull the battery temp while charging.
 

ChasingCoral

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Charging curve update from Norway.
@ChasingCoral ...The answer to your question in the other thread. These numbers are pulled from Bjorn's Livestream for his range test and 1000km challenge.

bjorn testing min.jpg


bjorn testing percentage.jpg
Would you mind plotting those as cumulative (kWh) curves by time and SOC? That will help establish just how much charge we get during the initial peak and then at each charging level.
 

Wildthing

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Mach-E Premium AWD, 68 kWh battery
Charging station power : 350 kW (Petro-Canada)
Outside temp : 23F
Starting SOC : 88%
Arrival SOC : 19%
Highway speed before the test : 68 MPH
Peak charging speed : about 43 kW at 65%
Session summary : 61 minutes to charge from 19-80% (42 kWh).
He ended the charge at 80% after a drop at.... 6 kW!
 
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ajmartineau

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Would you mind plotting those as cumulative (kWh) curves by time and SOC? That will help establish just how much charge we get during the initial peak and then at each charging level.
Don't have time to back through to collect the exact kWh's at the end of each minute for all the sessions, but here's a summary. There is some heavy rounding going on though.

Ford Mustang Mach-E MME Charging Curve Data Collection 1613869830515
 


ChasingCoral

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Don't have time to back through to collect the exact kWh's at the end of each minute for all the sessions, but here's a summary. There is some heavy rounding going on though.

Ford Mustang Mach-E MME Charging Curve Data Collection 1613869830515
OK, thanks. I didn't know how you collected the data as you watched it..
 

dbsb3233

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I watched some of Bjorn's 1000 km live stream drive around Norway this morning. Most of his charging sessions went pretty well. I logged one of them every few minutes. It was 3C (37F) outside.

Started charge @ 8:23 MT...
Began at 10%, ramping up fast in the first minute
155 kW at 11%
145 at 15%
105 at 17%
105 at 20%
105 at 23%
106 at 26%
106 at 29%
107 at 33%
104 at 36%
102 at 38%
90 at 40%
78 at 43%
82 at 45%
77 at 49%
75 at 51%
Stopped at 55% 8:47
 

NoPlanetB

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Don't have time to back through to collect the exact kWh's at the end of each minute for all the sessions, but here's a summary. There is some heavy rounding going on though.

Ford Mustang Mach-E MME Charging Curve Data Collection 1613869830515
Could you share the raw data (kW vs minutes and SoC) as a spreadsheet or CSV file? Then I would determine the kWh vs minutes and kWh vs SoC curves from that. I would also be interested in those curves.
 

MailGuy

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At 32 Amps on L2, Mach E took ~8 hours to go from 33% to 100%. When I picked up the car, it showed 200 miles at 100% with the ER battery. After my first charge to 100% GOM was reading 227 miles. It adapts to your driving pretty quickly. YMMV.
 

silverelan

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I watched some of Bjorn's 1000 km live stream drive around Norway this morning. Most of his charging sessions went pretty well. I logged one of them every few minutes. It was 3C (37F) outside.

Started charge @ 8:23 MT...
Began at 10%, ramping up fast in the first minute
155 kW at 11%
145 at 15%
105 at 17%
105 at 20%
105 at 23%
106 at 26%
106 at 29%
107 at 33%
104 at 36%
102 at 38%
90 at 40%
78 at 43%
82 at 45%
77 at 49%
75 at 51%
Stopped at 55% 8:47
The charge rate isn't bad. 24 minutes to add 44% SoC. I think we'd all like to see the 150+kW charge rate for longer than 2 minutes and the sustained charge for the meat of the charging session bumped up from the 100-110kW level.

Looks like Bjorn saw 75kW as the lowest sustained charge rate for his road trips.

Do you think the "52mi/ten minutes" charging speed Ford is claiming is an average or the best ten minutes?
 

dbsb3233

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The charge rate isn't bad. 24 minutes to add 44% SoC. I think we'd all like to see the 150+kW charge rate for longer than 2 minutes and the sustained charge for the meat of the charging session bumped up from the 100-110kW level.

Looks like Bjorn saw 75kW as the lowest sustained charge rate for his road trips.

Do you think the "52mi/ten minutes" charging speed Ford is claiming is an average or the best ten minutes?
I think it was advertised as "62mi/ten minutes", IIRC. Up from the 47 mi they originally advertised. But yes, I'm convinced that's the peak 10 minutes, not the average. They continue to say "10-80% in 45 minutes", which is consistent with the 47/10 number.

10-80% in 45 minutes is an 82 kW average. Bjorn averaged 99 kW, which is even better, although he stopped at 55%. If he'd continued to 80% I'm guessing his average would have been right around that 82 kW expectation. To achieve that in 37F temps is quite good. And he was able to repeat that pattern on many chargers (although some fell short). We've also seen *some* other examples consistent with that.

So I'm confident the MME is capable of it. I just think they're having some issues getting the software tweaked right to handshake with EA and other US networks. And it's compounded by the exceptional cold in the US the last month that pushed many charging attempts into below freezing range, where it probably really does fall way off. This is just my guess, but charging below 30F is probably gonna be slow even after they get kinks worked out.
 

silverelan

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I think it was advertised as "62mi/ten minutes", IIRC. Up from the 47 mi they originally advertised. But yes, I'm convinced that's the peak 10 minutes, not the average. They continue to say "10-80% in 45 minutes", which is consistent with the 47/10 number.

10-80% in 45 minutes is an 82 kW average. Bjorn averaged 99 kW, which is even better, although he stopped at 55%. If he'd continued to 80% I'm guessing his average would have been right around that 82 kW expectation. To achieve that in 37F temps is quite good. And he was able to repeat that pattern on many chargers (although some fell short). We've also seen *some* other examples consistent with that.

So I'm confident the MME is capable of it. I just think they're having some issues getting the software tweaked right to handshake with EA and other US networks. And it's compounded by the exceptional cold in the US the last month that pushed many charging attempts into below freezing range, where it probably really does fall way off. This is just my guess, but charging below 30F is probably gonna be slow even after they get kinks worked out.
https://media.ford.com/content/ford...0/05/15/10-minute-top-off-mustang-mach-e.html

"The all-wheel-drive version with extended-range battery is estimated to add an average of 52 miles of range in approximately 10 minutes"

270mi EPA range / 88kWh usable = 3.07mi/kWh

From Bjørn's videos we know it takes 30 minutes to get 50kWh.

Looks like 30 minutes of charging will get us over 150 miles of EPA range on the 4X.
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