Energy added decreases after charging

[MountainAlive]

So I’ve noticed this happening more often lately and I’m not sure why. When I’m charging on level 2 for several hours the FordPass app shows I’m getting X number of KWh’s as added energy. Then later, after I’ve stopped charging I look in the charging history of the app. For that same session the app then shows I added significantly less KWh than it said I was adding while it was charging. Anyone else notice this behavior?

————charging session:

———-charge history:

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[DavidS]

My armchair guess is one is the energy delivered from the plug and the other is the energy stored. “Wasted” energy increases rapidly after the 90% charge level due to a variety of factors.

 

[K6CCC]

My first guess is this is due to the charge to 100% and the resulting battery equalization. Do you get similar results on charges to lower levels?

 

[P-38]

I've had this as well. App said I added 102. Wall charger said I added 99 (which it's normally higher than the number the truck reported because of charging losses). History says 89 added.

 

[TaxmanHog]

I've noticed this issue for many months.

It is most noticeable in the cold season when the truck is using some energy for warming the HVB.

The after charging record drops this value to only the energy to gain x%% SOC.

Additionally, charging to 100% takes some extra energy during the balancing phase, that is also dropped from the final results record

 

[Heliian]

Sometimes the Ford app keeps logging kwhs while still connected but not charging.

 

[JMD359]

The app has been buggy for me lately , I also get O miles of range shown on my app occasionally and 10 minutes alter it will show 200 miles at 90 percent (SR truck ) this will
Go on and on continuously .i suspect your app is buggy

 

[RickLightning]

My armchair guess is one is the energy delivered from the plug and the other is the energy stored. “Wasted” energy increases rapidly after the 90% charge level due to a variety of factors.

No, the Ford app has no idea of the energy sent from the house. It's an app issue and the 100% cell balancing.

My first guess is this is due to the charge to 100% and the resulting battery equalization. Do you get similar results on charges to lower levels?

I've had this as well. App said I added 102. Wall charger said I added 99 (which it's normally higher than the number the truck reported because of charging losses). History says 89 added.

I've noticed this issue for many months.

It is most noticeable in the cold season when the truck is using some energy for warming the HVB.

The after charging record drops this value to only the energy to gain x%% SOC.

Additionally, charging to 100% takes some extra energy during the balancing phase, that is also dropped from the final results record

Sometimes the Ford app keeps logging kwhs while still connected but not charging.

The app has been buggy for me lately , I also get O miles of range shown on my app occasionally and 10 minutes alter it will show 200 miles at 90 percent (SR truck ) this will
Go on and on continuously .i suspect your app is buggy

The number shown on screen 1 should match the number shown on screen 2. The only reason they don't is either a crappy app or crappy server data.

The truck will pull sometimes well over 10% more energy than expected if you go to 100%.

Last August I charged from 89 to 100%, used 23.7kWh (from house). .11 x 131 = 14.4 vs. (23.7x.93=22). That's an extra 53%.

In early March, I charged to 100% for a trip, from 90%. Used 25.7 (net 23.9) vs. 13.1. 82% more.

On the Mach-E, I charged from 90 to 100% last week for a trip. Used 14.02 from the house, 13.04 net. I have 94% SOH, 91 x .94 = 85.5, 10% = 8.6. 13.04 is 52% more.

 

[MountainAlive]

Yeah it’s strange for sure. Happened to me again today when I tried charging from 85% to 100%. During the charge session it said I added 29kwh. But later when I checked the charge history in the app it said I only added 21kwh. It seems to be related to that “last mile” of charging from the high 90s to 100%. Maybe Brian from @Ford Motor Company has connections in high places and can help us understand this one.

 

[chl]

The balancing is passive, so the high charged cells are 'drained' until they match the lower charged ones and that shows up as the lost energy - it is lost to heat through resistance inside the battery when the cells are being drained.

The balancing occurs during and right after charging (as well as if the truck sits unused for 48 hours!).

A sudden bigger drop in capacity could be one sign of a bad module(s) however there would likely be many other signs.

Why drain higher charged cells during charging you might wonder?

The higher charged cells would otherwise stop the charging cycle and the weaker cells will not get charged to their maximum capacity. Some energy is 'wasted' doing this. Active balancing would use the excess energy to charge the weaker cells and not waste it through heat, but it is a more complicated arrangement - passive balancing is simpler.

Why drain higher charged cells after sitting for 48 hours through balancing?

Kind of a mystery, but it might be to avoid a risk of dendrites forming which can end up causing shorts, and thermal runaway could result? Just my guess.

 

[MountainAlive]

The balancing is passive, so the high charged cells are 'drained' until they match the lower charged ones and that shows up as the lost energy - it is lost to heat through resistance inside the battery when the cells are being drained.

The balancing occurs during and right after charging (as well as if the truck sits unused for 48 hours!).

A sudden bigger drop in capacity could be one sign of a bad module(s) however there would likely be many other signs.

Why drain higher charged cells during charging you might wonder?

The higher charged cells would otherwise stop the charging cycle and the weaker cells will not get charged to their maximum capacity. Some energy is 'wasted' doing this. Active balancing would use the excess energy to charge the weaker cells and not waste it through heat, but it is a more complicated arrangement - passive balancing is simpler.

Why drain higher charged cells after sitting for 48 hours through balancing?

Kind of a mystery, but it might be to avoid a risk of dendrites forming which can end up causing shorts, and thermal runaway could result? Just my guess.

Well this would make the most sense although a gap of 8-10kwh is a ton of loss for balancing I feel. But could be it.

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