Ford Mustang Mach-E: Analysis of the charging curve during fast charging

Article menu

The Ford charges more slowly than the VW ID.4 – it does not exhaust its potential

Ford Mustang Mach-E: Analysis of the charging curve during fast charging-charging

Recently our US colleague Kyle Conner conducted a quick charge test with a Ford Mustang Mach-E on its "Out of Spec Reviews" channel. It was the First Edition as an extended range version with all-wheel drive.

The Ford Mustang Mach-E that Kyle used in his test is one of the first to hit the streets with the original firmware from the factory. He charged the car from 0 to 100 percent at an Electrify America charging station. You can see the video here:

In the following article we analyze the charging curve. The entire charge (0-100%) took about 2 hours and 32 minutes, but we will mainly focus on the range up to about 80-85 percent.

Decrease in charging power with increasing SOC

The Ford Mustang Mach-E‘s DC quick charge curve is quite specific. It starts relatively strong and almost immediately reaches the peak value of 159 kW, which is not maintained for long. The next "stable level" is around 112 kW, which is available at around 7-10% charge level (SOC). At 11-27% SOC it is 106-107 kW. After a further decrease, the charging power remains at 95-97 kW, which is reached at 31-37% SOC.

Charging beyond 80 percent SOC doesn’t make sense at the DC fast charging station, especially not over long distances.

The main stable level is 76-80 kW at 40-77% SOC. The biggest surprise is that the charging power drops sharply to around 12 kW at 80% SOC and then stays that way. At the very end, the car charges even more slowly with only a few kW. Charging more than 80 percent on DC quick chargers doesn’t make much sense. You would just have to wait too long, especially on long journeys.

Presumably, the software still has a high potential for optimization when loading over 80 percent. The overall performance between 7 and 80 percent SOC should also be increased with an over-the-air update.

Ford Mustang Mach-E: Analysis of the charging curve during fast charging-mach-e

Average charging time for 20-80%

Now let’s look at the change in the state of charge over time. It took about 42 minutes to load from 20 to 80 percent (white area in the diagram below).

Ford Mustang Mach-E: Analysis of the charging curve during fast charging-mach-e

Average charging power at 20-80% SOC

The average charging power in the very important area of ​​20 to 80 percent SOC is 84 kW (marked with a black rectangle), which corresponds to 53 percent of the maximum value.

Ford Mustang Mach-E: Analysis of the charging curve during fast charging-mustang

Only the range up to 90 percent SOC is shown in the diagram, as the accuracy of the measurement and the calculation of the final, low power range is insufficient.

C rates over the course of the loading process

The maximum C-rate (i.e. the charging power in relation to the total battery capacity of 98.8 kWh) is around 1.61C. The average C-rate when charging 20 to 80 percent is 0.85C. In a sporty car like the Ford Mustang Mach-E, we think it should be improved.

As a reminder: The C-rate indicates how the charging power relates to the capacity of the battery. 1C means, for example, that the charging process takes one hour because the charging power in kW has the same value as the capacity of the battery in kWh. At 2C the battery would be charged in half an hour.

Ford Mustang Mach-E: Analysis of the charging curve during fast charging-charging

How fast is the range recharged??

How quickly the range is recharged depends on the car’s power consumption, and this again varies depending on the application, e.g. whether you are driving in the city or on the highway. Here we use the range figures according to the US EPA standard:

  • EPA (combined)
    The EPA range is 434 km (270 miles) and the available battery capacity is 88 kWh. This results in a power consumption of 203 watt hours per kilometer. We already know that when charging from 20 to 80 percent, an average of 84 kW is charged. If we divide the 84,000 W by 12,180 Wmin / km (which is obtained by converting the 203 Wh / km into watt minutes per kilometer), this results in 6.9 km / minute.
  • EPA (Highway)
    The EPA range for the highway is 401 km (249 miles). This and the net battery capacity of 88 kWh results in a power consumption of 219 Wh / km. The average speed when charging from 20 to 80 percent is then 6.4 km / minute.

Ford Mustang Mach-E: Analysis of the charging curve during fast charging-ford

Comparison with the VW ID.4

Ford Mustang Mach-E: Analysis of the charging curve during fast charging-mustang

Ford Mustang Mach-E

Ford Mustang Mach-E: Analysis of the charging curve during fast charging-charging

VW ID.4

Comparison of the charging performance

We recently carried out a quick charge test on the VW ID.4 with the large battery (82 kWh gross or 77 kWh net). With this we now compare our Ford Mustang Mach-E First Edition.

The charging curve of the VW ID.4: Ford Mustang Mach-E: Analysis of the charging curve during fast charging-analysis VW ID.4 (2021): Analysis of the charging curve

Ford Mustang Mach-E: Analysis of the charging curve during fast charging-mach-e VW ID.4 in the DC charging test: How fast does the car really charge?

The Ford has a higher maximum charging power, it creates 159 kW, the VW only 128 kW. But the Ford is only a short distance ahead before the ID.4 takes the lead. Overall, the ID.4 looks better, especially considering the smaller battery. The data prove this:

  • Ford Mustang Mach-E: average charging power at 20-80%: 84 kW
  • VW ID.4: average charging power at 20-80%: 91 kW

If Ford tweaked the charging curve, the Mach-E could beat the ID.4.

Ford Mustang Mach-E: Analysis of the charging curve during fast charging-analysis

Comparison of the charging time for 20-80 percent SOC

Now a quick look at the time it takes to charge from 20 to 80 percent. The ID.4 clearly wins here:

  • Ford Mustang Mach-E, charging time from 20-80% SOC: 42 minutes
  • VW ID.4, time required for charging 20-80%: 31 minutes

The starting points have been adjusted to the lowest common SOC value.

Ford Mustang Mach-E: Analysis of the charging curve during fast charging-charging

Comparison of the C rate

Compared to the Ford Mustang Mach-E, the VW ID.4 achieves a significantly higher C-rate when charging from 20 to 80 percent:

  • Ford Mustang Mach-E, average C-rate when charging from 20 to 80%: 0.85C
  • VW ID.4, average C-rate when charging from 20 to 80%: 1.1C

Ford Mustang Mach-E: Analysis of the charging curve during fast charging-mustang

Compared to range reloading

And now let’s compare how quickly the two cars recharge range, assuming the range in the EPA highway cycle:

  • Ford Mustang Mach-E, charging 20-80% SOC: 6.4 km / minute
  • VW ID.4, when charging 20-80% SOC: 7.3 km / minute

The ID.4 is around 13 percent faster, which reflects both the higher average charging performance and the lower power consumption.

Ford Mustang Mach-E: Analysis of the charging curve during fast charging-mach-e

Conclusion

The conclusion of our analysis is: The Ford Mustang Mach-E ER AWD does not fully utilize its potential for fast charging.

The charging curve is not bad in the range of 20 to 80 percent SOC, but firstly it drops off steeply afterwards and secondly it could be significantly better. We hope for a noticeable improvement through a software update.

General information:

1.) Some values ​​in the diagrams are estimates from the data source.

2.) The temperature of the battery cells can have a very negative effect on the charging capacity. We have no data on the temperatures of the battery at the beginning and during the charging process. At low or high temperatures and after very dynamic driving, the charging power can be significantly lower than indicated in the diagrams. In extreme cases, the charging process can even be completely impossible.

Related articles

Please follow and like us:

Leave a Comment