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Home charing Kw deliverer from charged vs Car filled

sri

sri

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I am charing my 2022 Air GT from 20% to 80% recently. I am using a Tesla L2 home charger using the Lucid adaptor NACS to CCS. Tesla says it delivered 84 to 85Kw per this sessions of total. 60% of the batter. My battery capacity is 112kw and i dont this not all 112kw is usable. Even considering 112 usable, it should be 66kw delivered from my charger(i verified tesla l2 number with my Electric usage and both matches). I know there is some loss involved like cooling cable or battery whole charing. But 25% loss seems too high even compared to a 350kw charger.

Is this normal or do i have some issue with my Tesla charged or my Lucid GT?
 
I would expect AC charging losses to be in the 12% to 15% range unless it is really hot and there is a lot of battery cooling.
 
I calculated all my 10 previous charges and i observed a loss of 18 to 22%. I live in Florida and my car is parked in garage. My charging is between 12AM and 7AM. This seems too much loss and KW to miles driven gets a big dent if we calculate this loss.

My average is 3.1miles/Kw and if i add this 20% loss, then my cost per mile is high. Not sure i am having some issues with my battery or if this is normal loss for charging.
 
sri said:
I calculated all my 10 previous charges and i observed a loss of 18 to 22%. I live in Florida and my car is parked in garage. My charging is between 12AM and 7AM. This seems too much loss and KW to miles driven gets a big dent if we calculate this loss.

My average is 3.1miles/Kw and if i add this 20% loss, then my cost per mile is high. Not sure i am having some issues with my battery or if this is normal loss for charging.
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How are you calculating your loss? It is normal for AC charging to have around 15% loss due to voltage boost and AC to DC conversion long with resistive losses in the wiring and battery. If it is hot out and the battery needs to be cooled that will also add to the loss.
 
Adnillien said:
How are you calculating your loss? It is normal for AC charging to have around 15% loss due to voltage boost and AC to DC conversion long with resistive losses in the wiring and battery. If it is hot out and the battery needs to be cooled that will also add to the loss.
Click to expand...
My charger says it delivered 74kw last night and my car says 61kw received. I am considering the difference 13kw is loss which is over 20% ☹️
 
sri said:
My charger says it delivered 74kw last night and my car says 61kw received. I am considering the difference 13kw is loss which is over 20% ☹️
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I don’t know if this matters, but the loss is 18% ( 13 / 74).
 
It would be interesting to see what the numbers look like at a DCFC
 
I hate to be "that guy", but just a note on the terminology. The total amount of electricity delivered to the battery is kWh, not kW.

kW is the speed at which the electricity is delivered (like say 11 kW from a Tesla home charger).
kWh is the amount of electricity delivered over time (like say 80 kWh when charging all night).

For example, a charger delivering 11 kW for 8 hours would total 88 kWh.
 
Here are some L2 charger stats for my Gravity (using 117.39 kWh as 100% usable capacity):
  • 4/27: delivered 17.8995 kWh (15.25%), received 13%, efficiency 85% (15% loss)
  • 4/29: delivered 17.3897 kWh (14.81%), received 13%, efficiency 88% (12% loss)
  • 5/1: delivered 17.7360 kWh (15.11%), received 12%, efficiency 79% (21% loss)
  • 5/5: delivered 17.5778 kWh (14.97%), received 12%, efficiency 80% (20% loss)
  • 5/6: delivered 18.1904 kWh (15.50%), received 14%, efficiency 90% (10% loss)
I wish the Gravity had more detailed stats and precision without having to use a 3rd party app for data collection.
 
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