Connected Home Charger - Speed Decreasing on 100A Circuit

[DeaneG]

See, I've never gotten anything but the white light. No red lights here. And unplugging and replugging fixes it, which is what makes me think it's the car.

I wonder if the car's data collection includes the J1772 (available current) pilot signal duty cycle?

 

[ERdoctor23]

2023 Air Pure AWD. Using Lucid LCHCS. 100A. Same issue after recent OTA upgrade. Dropped off significantly to around 15 m/h and 3-5 kWh. Went from 1-2 hour time to charge up to 6-10 hours! I stopped the charging and noticed the AC running while it was charging. I turned off the AC, unplugged the cable and began charging. Immediate improvement back to old speeds. Now charging at 77 m/h and 18 kWh. Now 60-90 minutes to charge up to limit. Maybe this helps solve the slow charging issue many have experienced. Let me know if it helped you too.

 

[Miami_Lucid_Man]

2023 Air Pure AWD. Using Lucid LCHCS. 100A. Same issue after recent OTA upgrade. Dropped off significantly to around 15 m/h and 3-5 kWh. Went from 1-2 hour time to charge up to 6-10 hours! I stopped the charging and noticed the AC running while it was charging. I turned off the AC, unplugged the cable and began charging. Immediate improvement back to old speeds. Now charging at 77 m/h and 18 kWh. Now 60-90 minutes to charge up to limit. Maybe this helps solve the slow charging issue many have experienced. Let me know if it helped you too.

Was it the AC or the car’s fans cooling the battery? I ask because I am wondering if this is a software issue or an ambient temperature issue. @borski and I have had some back and forth on this in another thread.

I’ve had throttling of my Tesla gen 3 wall charger around the time of I believe the 2.7.0 update but it was also getting warmer down here with summer here. That said I never had this issue when I had my Tesla.

 

[Miami_Lucid_Man]

So here’s a perfect example. I was down to about 80 mile range so time to charge at home. The second screenshot is from 10 o’clock at night and you can see it starts off just fine at the full 11-11.5 KW from the Tesla gen three wall charger. Not 30 minutes later and probably less I just didn’t check it sooner you see it’s now dropped to 6 kW. I have a large grade dehumidifier I recently installed in the garage so the humidity is literally down into the 30s even here in Miami and the cabin temperature is overall reasonable for this time of year as well. The speed is gonna fluctuate the rest of the night between six and 7 kW.
This never happened in the first two months. I had the car starting in March of this year.

 

[borski]

So here’s a perfect example. I was down to about 80 mile range so time to charge at home. The second screenshot is from 10 o’clock at night and you can see it starts off just fine at the full 11-11.5 KW from the Tesla gen three wall charger. Not 30 minutes later and probably less I just didn’t check it sooner you see it’s now dropped to 6 kW. I have a large grade dehumidifier I recently installed in the garage so the humidity is literally down into the 30s even here in Miami and the cabin temperature is overall reasonable for this time of year as well. The speed is gonna fluctuate the rest of the night between six and 7 kW.
This never happened in the first two months. I had the car starting in March of this year.
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That’s exactly what’s happening to me, just at higher rates (18 kW to like 7-8kW).

I bet if you stop charging, unplug, and plug back in and start charging again it will go right back to the high rate.

If that’s true, then we have confirmation it is the car and not the EVSE, which would mean it’s something Lucid could hopefully track down.

 

[tonybot]

That’s exactly what’s happening to me, just at higher rates (18 kW to like 7-8kW).

I bet if you stop charging, unplug, and plug back in and start charging again it will go right back to the high rate.

If that’s true, then we have confirmation it is the car and not the EVSE, which would mean it’s something Lucid could hopefully track down.

I face this same issue with my LCHC. Starts off great but then tapers down. Unplugging and plugging the cable picks it right back up.

 

[SBD1500]

I had a Pure 2023 for 2 years. Now I have a 2025 Touring less than 1 week old. I'm getting the same charging behavior that maybe started 6-8 months ago with my Pure. Estimated. I get the normal 11kw charging speed for about 30 mins..then after that it drops to 5kw. This is using a Tesla gen 3 charger with adapter. The Tesla has no slow down.

 

[Miami_Lucid_Man]

Morning update: still 20 mins to go at 6 kw…

Hot cabin temp for sure, but again, nothing different than with my prior Tesla.

 

[skomarla]

Hopping on the thread to say the same! I’m not sure when this started but I noticed this atleast a month ago. Didn’t think much of it at the time.

I’m on a 100a breaker with the LHCS connected to a sub panel installed by an electrician and properly torqued. Used to see 18kw dropping to 11kw occasionally for temp management but now I see 18kw dropping to 7 for extended periods of time.

Took maybe 3.5-4 hrs to go from 55% to 80% overnight. Didn’t pay attention to the exact times.

I can say though that it started at 11:08 pm at 55% SOC.
At 12:24 am it was at 66% and had added only 47 miles. At 11:08 the intial estimate in the app was 1 hr and 25 mins. At 12:24 the estimate was 1 hr and 50 mins remaining.

 

[DeaneG]

A small and unrelated point - a dehumidifier will only make animals that sweat or pant more comfortable. It doesn't help to cool electronics.
A fan could help to move charging-related excess heat from the general area of the car, but this isn't likely to make a significant difference.

 

[jsf1993]

Hopping on the thread to say the same! I’m not sure when this started but I noticed this atleast a month ago. Didn’t think much of it at the time.

I’m on a 100a breaker with the LHCS connected to a sub panel installed by an electrician and properly torqued. Used to see 18kw dropping to 11kw occasionally for temp management but now I see 18kw dropping to 7 for extended periods of time.

Took maybe 3.5-4 hrs to go from 55% to 80% overnight. Didn’t pay attention to the exact times.

I can say though that it started at 11:08 pm at 55% SOC.
At 12:24 am it was at 66% and had added only 47 miles. At 11:08 the intial estimate in the app was 1 hr and 25 mins. At 12:24 the estimate was 1 hr and 50 mins remaining.

I have been experiencing the same issue for months…..I’ve noticed that the handle connecting to the car overheats and the AMP’s throttle back in response. I’ve had an electrician confirm that the charger was installed pursuant to all specs, including compression lugs. Very frustrating not to get what one paid for, especially after reconfiguring my panels to provide 100 AMP service for the Lucid charger. Honestly, I have concluded that the charger is simply a defective product and should be recalled.

 

[skomarla]

I have been experiencing the same issue for months…..I’ve noticed that the handle connecting to the car overheats and the AMP’s throttle back in response. I’ve had an electrician confirm that the charger was installed pursuant to all specs, including compression lugs. Very frustrating not to get what one paid for, especially after reconfiguring my panels to provide 100 AMP service for the Lucid charger. Honestly, I have concluded that the charger is simply a defective product and should be recalled.

if people are experiencing similar issues with other brand chargers, the issue maybe elsewhere.

next time i need to charge, i'm going to do it during the day, and stop and restart it to see if it stays at 18kw as mentioned in this thread. if it starts back at 18 and continues, it would imply a software issue.