Discrepancy between electricity going in and battery

[antimatterparticle]

So I have noticed that my EV juice box shows a higher amount of energy added than what the Ford App shows.

why would this happen?

update: in this charging session the final results are

71 in

64 charged

Which seems to be in line with the 10% mentioned here.

I am wondering if the 80amp Ford Charger is more efficient. (Wiring, less time to charge=less heat created etc). Can you track how much energy goes in with the Ford charger like the Juicenet?

but if this is the norm, people should be adding an additional 10% to the cost of operation.

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[Pioneer74]

Charging losses.

https://www.caranddriver.com/features/a36062942/evs-explained-charging-losses/

 

[trev5150]

Stupid thermodynamics....

 

[GarageMahal]

 

[vandy1981]

why would this happen?

The JuiceBox is measuring kWh delivered to the truck from the JuiceBox, which includes energy lost to heat and operation of the coolant loops and inverters. The truck is only reporting the energy that's added to the battery pack. Also, I would not trust the Ford app to give you accurate real-time or logged charging session data--it's been unreliable in my experience.

You should expect to lose around 12-15% between the EVSE and battery with level 2 AC charging. Losses should be below 5% with level 3 DC fast charging.

 

[Akbrian]

Put in 3.78 and got 2. That’s no where close to 10-15%. Loss.

 

[Maquis]

Put in 3.78 and got 2. That’s no where close to 10-15%. Loss.

There’s overhead involved initiating a charge. Short sessions always look worse. Notice that by the time the session completes, the losses are in line with expectations.
Another problem with small numbers is that the Ford side is rounded. 2 could be 2.4. Maybe even truncated from 2.9?

 

[adoublee]

Put in 3.78 and got 2. That’s no where close to 10-15%. Loss.

"update: in this charging session the final results are 71 in 64 charged". That is 10%, and better data than going off of readings at 2kWh of charging to the whole number kWh precision.

Also helps to know accuracy of metering.

 

[antimatterparticle]

"update: in this charging session the final results are 71 in 64 charged". That is 10%, and better data than going off of readings at 2kWh of charging to the whole number kWh precision.

Also helps to know accuracy of metering.

the issue is that on a 131kwh battery 10% loss tends to add up.

i may have not noticed it before with other EVs because the battery pack is much smaller.

Also I can barely get 260 miles. I’ll have to wait a couple of months and see if it becomes too much of a pig…

 

[Maquis]

the issue is that on a 131kwh battery 10% loss tends to add up.

i may have not noticed it before with other EVs because the battery pack is much smaller.

Also I can barely get 260 miles. I’ll have to wait a couple of months and see if it becomes too much of a pig…

Going into winter, 260 is likely your high water mark. Expect to see 200, maybe less if you see sub-zero temps. It will come back up next summer.

 

[TaxmanHog]

"update: in this charging session the final results are 71 in 64 charged". That is 10%, and better data than going off of readings at 2kWh of charging to the whole number kWh precision.

Also helps to know accuracy of metering.

That's good, I've been observing around 11% losses.

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