I'm also getting limited by the EA 350kW station in SoCal after the first 100 miles the charge went from 10 miles /min to 84 mi/hr within the next 80 miles of charge.Greetings all,
I just wanted to share some odd charging behavior I've noticed with my car at DCFC stations. I've included a table documenting a recent 6-80% SoC charging session preceded by some context and my thoughts. For reference, my car is a 2023 Touring produced in January 2023. If anyone has seen similar behavior or have any thoughts I would love to hear it!
I first noticed oddly low DCFC speeds about a month ago. I've seen peak charging speeds of 290kW+ several times with my car, but on the last couple of long distance road trips I've taken the highest I've seen is around 235kW at <10% SoC, even after 30+ minutes of preconditioning. It also seems like the curve dips below 150kW about 10% SoC sooner than it used to. This shift seems to have occurred sometime between the beginning of August and October. It's also worth noting that this behavior has been repeatable across multiple 350kW Electrify America stations and a couple of EVgo stations. Ambient temperatures have typically been between 40-80F, usually around 60-70F. The battery has always been preconditioned for 40-45 minutes automatically via the route planner, or manually for at least 30 minutes. Since I've noticed this behavior I have not seen the "Charging speed limited by station" message, so I'm fairly certain the cause is the car and not the charging station, temperature, etc. The table below shows my most recent DCFC session at a 350kW EVgo unit. I noticed that during the charging session the voltage stayed relatively constant from around 700-725v, so no issues there.
So why the sudden change in DCFC behavior? So far I have three theories, the first being battery degradation. I've driven my car farther and harder than most other owners (I assume), and I'm sitting at 16,600 miles after 7 months of ownership. While I've maintained the recommended 80% daily SoC limit and tried not to go below 20% too often, there's been plenty of times I've charged to 100% for long distance travel and been as low as 3% a handful of times. Using the car's range estimate it claims I can travel 367 miles on 100% SoC. This would equate to a 4.5% loss in battery capacity (367 current max range / 384 inital max range on 20" wheels). Given how much I've driven the car already this doesn't seem too far off of estimates I've seen staying to expect a loss of 1-2% capacity per year. I'm not sure why this would cause such a noticeable change in charging behavior, but I thought it was worth noting.
My second theory is that recent software updates to the car have affected the charging curve in some way. This shift I've described occurred sometime between August and October, during which time no major changes in mileage occurred. I'm not sure if a software update even could affect the charging behavior this way, but if anyone else has noticed something similar maybe it's worth investigating. My last and most likely theory would be some kind of hardware or BMS issue with my car. I did almost get stranded in Battle Mountain, NV this summer due to a known issue with ABB units, so I've definitely experienced significant charging issues with my car before.
Thanks for reading! I'd greatly appreciate any thoughts or theories you might have. If this seems to be an isolated issue I will probably forward this issue to Lucid to see what they think. While this issue is relatively minor (especially now that road trip season is ending) and the reduction in charging speed realisically only adds 5-10 minutes of charging, the high charging speeds was something I really appreciated on long road trips. Now I feel like I can barely charge faster than an ID4.
SoC kW 7% 232 10% 205 15% 176 20% 164 25% 153 30% 143 35% 136 40% 128 45% 116 50% (16 mintues) 104 55% 93 60% 84 65% 75 70% (30 minutes) 67 75% 59 80% (40.5 minutes) 50
No change in use at the 3 chargers that were all in use at the time.
I'm thinking that since the charging is included in prc of the car that EA prefers to charge others a higher fee per kW hr and intentional lowers the rate of charge to get you to give up early?
It worked for me, I left at 290 miles total range.
It was the same speed to charge at home at that point.
Anyone else hv this happen?