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.
View attachment 31709

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.

 

[Chrome]

I didn't even realize this thread existed; probably skipped past it because it immediately refers to the LCHC, which I do not have. I'm using the Mobile Charging Cable in a garage, and have run into this approximately-half-rate charging issue since May. It did seem to begin occurring after an update, but the frequency is intermittent so it's hard to nail down a specific version.

I would see 9kW ever since start of ownership, now I see 4kW about every-other time I charge the car. SOC does not seem to matter. Garage is very warm, but nothing unusual. The cable from the NEMA 14-50 to the Control Unit is hot, while the remainder (to the car) is room temperature.

Thanks to the most recent update that allows us to view/adjust the Current Limiter, I was able to snap this picture which effectively proves the vehicle is in control of what's happening here. Normally, the limit is "80 A". When inexplicably throttling, the limit range is reduced to "16 A".

It's quite frustrating to wake up at 6AM for a 400-mile drive and find out that you're going to have to stop en-route because the car decided the original Time Remaining was far too soon and should have a few more hours tacked on.

 

[DeaneG]

I didn't even realize this thread existed; probably skipped past it because it immediately refers to the LCHC, which I do not have. I'm using the Mobile Charging Cable in a garage, and have run into this approximately-half-rate charging issue since May. I......Thanks to the most recent update that allows us to view/adjust the Current Limiter, I was able to snap this picture which effectively proves the vehicle is in control of what's happening here. Normally, the limit is "80 A". When inexplicably throttling, the limit range is reduced to "16 A"....

That 16/16 A indicates that the mobile cable is telling the car that the car may only pull 16 amps from the charging cable (the bottom 16 amp numerals), and that the car is doing so (the top 16 amp numerals).

The mobile charging cable is throttling the charge rate to 16 amps, likely because the 14-50 receptacle is overheating. This is very common if a residential-grade receptacle is used, and can result in a fire. The correct (EV-rated) type of 14-50 receptacle has a face diameter of about 2.44 inches. Residential receptacles that are not safe for EV charging have a face diameter of about 2.1 inches.

If after charging for a while, pull the mobile cable's 14-50 plug fully out of its receptacle in your garage, and touch the plug's prongs with your fingers. They will feel warm, but should be only pleasantly so. If they feel hot, the mobile cable prevented a meltdown and/or a fire by throttling down.

 

[sbr41]

I was facing the same issue and flagged it to a mobile service technician who was seeing my car for a different reason. I provided date and time of each charge session when I plugged in, along with charge rate drop. He shared it with engineering and after 2-3 weeks, got back to me - "if it is warm inside the garage, the lucid charging station will drop the charge rate to cool down". He further told me "The best setting during the summer months should be around 56amps to avoid it overheating and throttling down."

I went ahead and changed the dip switch to 56amps and do not face the issue anymore.

 

[martinmeyer]

I just noticed a few nights ago that my car was only charging at 4kW when it should have been charging at ~9kW, and now I've found this thread. I am NOT using a Lucid wall charger though. I'm using a Tesla wall charger, v2, with a Lectron NACS -> J1772 adapter.

I have pretty good monitoring on my electric usage, but unfortunately I can't differentiate specific things connected to my garage subpanel. From historic graphs though, it appears this behavior started on June 4th:

The pattern looks pretty regular in recent times:

This looks like a software controlled thing to me. The shape is very regular.

 

[Miami_Lucid_Man]

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.

Yeah I’m realizing that after trying both. At least it makes this animal that sweats more comfortable for now!

 

[Miami_Lucid_Man]

I didn't even realize this thread existed; probably skipped past it because it immediately refers to the LCHC, which I do not have. I'm using the Mobile Charging Cable in a garage, and have run into this approximately-half-rate charging issue since May. It did seem to begin occurring after an update, but the frequency is intermittent so it's hard to nail down a specific version.

I would see 9kW ever since start of ownership, now I see 4kW about every-other time I charge the car. SOC does not seem to matter. Garage is very warm, but nothing unusual. The cable from the NEMA 14-50 to the Control Unit is hot, while the remainder (to the car) is room temperature.

Thanks to the most recent update that allows us to view/adjust the Current Limiter, I was able to snap this picture which effectively proves the vehicle is in control of what's happening here. Normally, the limit is "80 A". When inexplicably throttling, the limit range is reduced to "16 A".

It's quite frustrating to wake up at 6AM for a 400-mile drive and find out that you're going to have to stop en-route because the car decided the original Time Remaining was far too soon and should have a few more hours tacked on.

Wow another sample of starting in May. That’s when it happened to me too. I think it may be a software issue from an update around that time.

 

[DeaneG]

Wow another sample of starting in May. That’s when it happened to me too. I think it may be a software issue from an update around that time.

The question: is it a bug, or a feature?

 

[Miami_Lucid_Man]

The question: is it a bug, or a feature?

I’d accept it as a feature if they acknowledged it!