Charging loss or some other issue...?

[Jeremybj]

Greetings to all,

I have a 2022 lightning ER.

I am using an openevse to charge the truck at 48 amps. The openevse is displaying about 17.5kw to charge 10% and it is taking about 1 hour 35 minutes. The math there isn't adding up. At that charge rate it should be about 1 hour 20 minutes to charge 13.1 kw.

I think that the 17.5kw is accurate as the time of 1 hour 35 minutes is pretty close to what it should be putting out.

Is it possible I'm losing about 4.3kw to charging losses over 10%?

Anyways, any insight from anyone would be appreciated. Like I said the time and the openevse total dispensed seems to add up, but the amount delivered to the truck is very short.

Jeremy

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[GoodSam]

Maybe heating the battery coolant as you charge? Is it a steady 17.5kW / 10% charge increase, all the way from say 20% to 100%? I lost a little when I kept my F150L "On" and the climate controls were running heat in the cab!

 

[Jeremybj]

It seems pretty consistent when charging from 70-80 and today when I went from 80-90.

I'm gonna have a pretty deep charge as I'm going on a road trip, so I'll report on Sunday after it charges.

The truck is in my garage and it "shouldn't" be heating the cabin unless I accidentally have a setting on that I shouldn't...?

Jeremy

 

[KrazyEd]

You do have conversion losses. From AC to DC and general losses. I generally figure the newer
EVs to be around 90% efficient on Level II. Level 1 is far less efficient as you have so little to work
with to begin with.

 

[Maquis]

What is the ambient temp in the garage? At low temps, the truck will use power to warm the battery.

 

[Jeremybj]

I don't heat my garage, but it is insulated. It's been hanging out between 35-40 Fahrenheit the last couple times of charging.

Doing quick math it seems like I'm losing about 24% to charging loss, which is double what I expected.

Jeremy

 

[RickLightning]

How do you know it was at a steady 11.5kW the entire time? Only the EVSE can tell you that, or an OBD reader connected to the truck.

In addition, the battery is cold. A warm battery is around 70 degrees. So it spends some energy warming the battery, and it may be charging slower until it is warm.

Lastly, if you're charging to 100% for a trip, it spends time finishing at the end.

With an OBD reader connected to the truck, you could sit there and figure it out.

 

[VTbuckeye]

I don't think to hat our trucks behave like our xc40 EV, and we certainly do not have the informative charging display that the Volvo has but maybe it does something in the background like our Volvo. When charging to he display will show Amps and the miles per hour added. When warm it will display something like 29amp, 15mph. When cold it will initially display 29amp, 0mph. After anywhere from 5 to 30 minutes, it depends on how cold the battery/outside temp, it will start adding range at 15mph 29amp. And 30 to 40 degrees is cold as far as the battery is concerned, but not exceptionally cold.

 

[TaxmanHog]

I've seen losses in the 10 to 25% range regularly on colder days.

As you're planning to charge from 90 to 100 % make sure to scheduled the session early enough to complete if you use "just in time charging"

This is an example of my truck's charging {energy consumption} curve by the minute, to go from 77 to 100%, the initial minutes could be the PTC warming the battery up to optimum charging temps.

This is the daily chart 39.8 KWH for Friday morning to noon

This is the FordPass charging log 77% to 100% infers 23% gain or about 30 KWH of a 131 KWH pack.
So 30/39 is ~77% efficiency or ~23% losses, temperature was mid 50's during this charging session in my garage.

This is the FordPass "Connected Charge Station" chart, note the time error is due to conversion EST to EDT since my last device configuration.

Also it only reports the charge statistics upon unplugging the truck, so the actual Thursday night charging is showing up as Friday morning [30.384 kwh], but the late morning to noontime record represents cumulative energy the by the minute charts show above [39.698]

The total energy measured by FCSP and my Emporia Vue2 are very close accuracy wise.

 

[Jeremybj]

Interesting, info taxmanhog. I appreciate you posting the graphs.

The openevse shows the total number of watts dispensed in a charge session and then I just figure 131 kw total pack size so I do my math based on the % of increase.

From what I'm seeing, taxmanhog sees the same percent delivered to percent dispensed as I am.

Vtbuckeye, also thank you for explaining the amps dispensed with 0 miles of added range for the start of your charging session.

I knew that fast charging relied on battery warming, but I didn't realize that level 2 charging had battery conditioning requirements too.

I guess what I'm seeing is "normal" so I'm not gonna worry about it. Thanks to everyone!

Jeremy

 

[Ventorum94]

Greetings to all,

I have a 2022 lightning ER.

I am using an openevse to charge the truck at 48 amps. The openevse is displaying about 17.5kw to charge 10% and it is taking about 1 hour 35 minutes. The math there isn't adding up. At that charge rate it should be about 1 hour 20 minutes to charge 13.1 kw.

I think that the 17.5kw is accurate as the time of 1 hour 35 minutes is pretty close to what it should be putting out.

Is it possible I'm losing about 4.3kw to charging losses over 10%?

Anyways, any insight from anyone would be appreciated. Like I said the time and the openevse total dispensed seems to add up, but the amount delivered to the truck is very short.

Jeremy

How can you get more than 11.5kW from 48Ax240v? Are you confusing “kWh added” with kW charging rate? (are your numbers 17.5, 13.1, and 4.3, kW or kWh?)

 

[RickLightning]

How can you get more than 11.5kW from 48Ax240v? Are you confusing “kWh added” with kW charging rate? (are your numbers 17.5, 13.1, and 4.3, kW or kWh?)

11.5 per hour. 1 hour and 35 minutes =

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