My Mach-e performance: Calculated running time (Mi/kWh)

[Sally's Own]

Has zero to do with a Ford system.

It can be easily measured IF you have an intelligent charger that shows the power sent to the vehicle, and IF you look at the charging session in FordPass BEFORE UNPLUGGING, when it shows you the most exact number.

With a hardwired charger, most have reported a 7% difference. Some 240v plugs have shown 10%. A 120v plug-in is closer to 15% loss.

These are not perfect numbers. If you charge at 48amps, you're loss is less than if you charge at 40amps, or charge at 32amps. But it's tiny.

Mine is hardwired into the house's 240V panel via a 100A breaker. The installation spec is 240VAC@80A. Obviously the charger supplies the desired current to the vehicle, less its losses. I'll try to compare the charger's energy to the figures at the vehicle. That should give the net losses.

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[RickMachE]

Mine is hardwired into the house's 240V panel via a 100A breaker. The installation spec is 240VAC@80A. Obviously the charger supplies the desired current to the vehicle, less its losses. I'll try to compare the charger's energy to the figures at the vehicle. That should give the net losses.

That is exactly the method I explained, yes.

80 x 240 (if you have exactly 240) = 19.2kW
93% would be 17.9kW.

You'll find many posts discussing this.

 

[Sally's Own]

That is exactly the method I explained, yes.

80 x 240 (if you have exactly 240) = 19.2kW
93% would be 17.9kW.

You'll find many posts discussing this.

As an example, FordPass shows 44kWH as added power. That value then is the vehicle's consumption. (9.28kW over 4.75H).

So it's simply the miles used divided by the reported number (141.1/44.1=3.2kWh).

The supplied power by the charger is irrelevant to that calculation, though the losses are nice to guess, but without the measuring device at the charger (which will vary over time as controlled at the vehicle, in some graphs I saw from others), we can't calculate the losses. It's clear that the supplied power will vary controlled by the vehicle. I can feel the cable to know it's running warm when a charge is in progress.

 

[Sally's Own]

As an example, FordPass shows 44kWH as added power. That value then is the vehicle's consumption. Not the maximum though (9.28kW x 4.75H), if it was running at full power over that time. Clearly it isn't though.

So the converter in the vehicle manages that communicating to the charger.

 

[Teslaeata]

112218 miles of stats:

I use the kWh supplied to the car in my calculations because, whilst not the car’s actual power usage in delivering the miles, in terms of the amount of power the car needs for its use and the cost of running it, I feel this is the correct “real world” figure to use.

So, in 927 charges delivering a total of 39,437.17kWh, 596 charges delivering 29,728kWh wear at home on the ABB 22kW charger though the car can only take 11kW maximum I believe.

331 charges delivering 9,708.24kWh were on DCFC charge points.

That provided an average of 2.85miles/kWh.

Quite a lot of the mileage is at motorway speed and heaters & A/Con mostly on.

Average overall cost is 9.75pence per mile which breaks down to 15p/mile on home charge mileage and 66p/mile on DCFC charges.

On UK petrol prices for ICE car achieving 40mpg delivered a saving of more than £8,000.

HVB has just been measured at 93.5% at 46mths.

E&OE

Am I happy with that? Youbetchabottomdollarboy!

 

[RickMachE]

As an example, FordPass shows 44kWH as added power. That value then is the vehicle's consumption. (9.28kW over 4.75H).

So it's simply the miles used divided by the reported number (141.1/44.1=3.2kWh).

The supplied power by the charger is irrelevant to that calculation, though the losses are nice to guess, but without the measuring device at the charger (which will vary over time as controlled at the vehicle, in some graphs I saw from others), we can't calculate the losses. It's clear that the supplied power will vary controlled by the vehicle. I can feel the cable to know it's running warm when a charge is in progress.

You're doing a whole bunch of work for no reason.

Plug in car and let it start charging. Open FordPass and note the energy coming in, it shows you. An intelligent charger shows the energy it is sending. There's your loss. Zero guessing.

Charging curve on AC charging is basically a flat line until the very, very end.

You can also look at hours of charging if you know when it started and finished, and take the total energy divided by time as you did, to show the energy. Your 9.28 is either wrong, or you're charging at around 40amps.

It's math:

80amp charger x 240v x 93% loss
or
48amp charger x 240v x 93% loss

As to the efficiency, you can take the miles driven and divide that by the kWh charged, but that won't math the car because it lacks the regen number.

Most people simply look at the trip odometer and see 3.1m/kWh and are done.

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