Connected Home Charger - Speed Decreasing on 100A Circuit

[borski]

I’m in South Florida and it’s only cooler than 85 like 1-2 months out of the year. I didn’t have this issue for the entire first year of ownership. There was even an unusually cool night a few weeks ago where the car still lowered the charge rate after a while. The charging cable is very thick so that it can handle the heat of charging at 80A, so I don’t see Lucid throttling their own charging equipment because of that…not to mention that the issue is happening with Tesla and other EVSE as well. I sure hope they release that patch soon; it’s been months and a handful of updates already.

@borski Do you experience this issue with your wife’s Gravity?

Thanks for everyone’s additional insights.

Nope.

 

[Bill AGT]

After reading your posts, I ran a test with my Autel Maxi Charger (80 amp). After charging to 80%, with the garage at about 90 degrees F, I charged to 85% to see if the charging degrades after 80%. Here is the charging graph for that brief charge. As you can see, the current held steady at 77 to 80 amps and about 19 kW. So I do not think that the car or software or temp is responsible. I thought y’all would be interested

 

[borski]

After reading your posts, I ran a test with my Autel Maxi Charger (80 amp). After charging to 80%, with the garage at about 90 degrees F, I charged to 85% to see if the charging degrades after 80%. Here is the charging graph for that brief charge. As you can see, the current held steady at 77 to 80 amps and about 19 kW. So I do not think that the car or software or temp is responsible. I thought y’all would be interested View attachment 31920

That’s too short of a charge. It sometimes happens within half an hour, but sometimes takes 60-90 minutes or longer. You should test it on a proper overnight charge.

 

[Bill AGT]

That’s too short of a charge. It sometimes happens within half an hour, but sometimes takes 60-90 minutes or longer. You should test it on a proper overnight charge.

Good point, but I was checking to see if it was the temp or over 80% reduction.

Cannot do overnight as the charger is so darn fast. Here is one where I was going on a trip and charged to 100%. Still at 80+ degrees F.

It did drop from 80 to 72 amps, but the kW was at 19 to 17 with an average of 18 kW. Adding about 45 kWhr or 40% during the session.

So again, I would look at the charger.

 

[Miami_Lucid_Man]

After reading your posts, I ran a test with my Autel Maxi Charger (80 amp). After charging to 80%, with the garage at about 90 degrees F, I charged to 85% to see if the charging degrades after 80%. Here is the charging graph for that brief charge. As you can see, the current held steady at 77 to 80 amps and about 19 kW. So I do not think that the car or software or temp is responsible. I thought y’all would be interested View attachment 31920

If there's any way to do a charge starting below 20% maybe that will give us a slightly larger sample size. I agree with @borski that where your charge ended is just about at the typical time we're all seeing huge drop offs.

 

[Bill AGT]

If there's any way to do a charge starting below 20% maybe that will give us a slightly larger sample size. I agree with @borski that where your charge ended is just about at the typical time we're all seeing huge drop offs.

The second one was for 2.5 hours! Only a slight drop off. I do not see me getting below 20% anytime soon. The one above show from about 60% to 100%. Not sure it would be any different with 20%.
Just trying to help. It’s not the car! Probably the charger or electrical issues.

 

[Miami_Lucid_Man]

The second one was for 2.5 hours! Only a slight drop off. I do not see me getting below 20% anytime soon. The one above show from about 60% to 100%. Not sure it would be any different with 20%.
Just trying to help. It’s not the car! Probably the charger or electrical issues.

Okay good data point nonetheless.

Our issue is many had this throttling issue come up around the same time in May-ish. We’ll keep investigating.

 

[borski]

The second one was for 2.5 hours! Only a slight drop off. I do not see me getting below 20% anytime soon. The one above show from about 60% to 100%. Not sure it would be any different with 20%.
Just trying to help. It’s not the car! Probably the charger or electrical issues.

No worries; if you do get a chance to not plug in for a night or two, it would be helpful to have the data!

 

[SBD1500]

I'm going to test again for next charge. But I turned off the climate control during my last charge and it held steady.

 

[Miami_Lucid_Man]

I'm going to test again for next charge. But I turned off the climate control during my last charge and it held steady.

When you say turned off climate control what do you mean? Literally got in car, powered off ac entirely, got out, and started charge? I’ll try anything at this point even if it’s circumventing a bug.

 

[SBD1500]

When you say turned off climate control what do you mean? Literally got in car, powered off ac entirely, got out, and started charge? I’ll try anything at this point even if it’s circumventing a bug.

I will test this again. Let me know your results.

 

[SBD1500]

Nevermind, the climate off doesn't effect the charging speed. Still decreased for me. I'm testing slightly limiting the in car charging setting now.

 

[SBD1500]

Alright I believe I've found a workaround to the charging speed drop offs. What I did was start charging normally then immediately set the charge limiter in car to 40/48 amps. It has been almost 3 hours and no slow down with a steady charge rate of 9kw (38 miles per hour). Not the usual 11kw I get before a slow down, but still better than the 5kw it would go to after about 30 mins of charging. Charger used is a Tesla Gen 3 wall charger with adapter. So for those of you that are experiencing the slow downs like many of us the past few months after an update, give this a try and let me know if it helps you.

 

[Miami_Lucid_Man]

Alright I believe I've found a workaround to the charging speed drop offs. What I did was start charging normally then immediately set the charge limiter in car to 40/48 amps. It has been almost 3 hours and no slow down with a steady charge rate of 9kw (38 miles per hour). Not the usual 11kw I get before a slow down, but still better than the 5kw it would go to after about 30 mins of charging. Charger used is a Tesla Gen 3 wall charger with adapter. So for those of you that are experiencing the slow downs like many of us the past few months after an update, give this a try and let me know if it helps you.

I’ll try it! 9 is better than 6.

 

[skomarla]

40a and 56a have worked for me without throttling.

Today ambient temp was 72F and on whim I pushed it to 80a with soc at 52% to charge to 80% and was throttled to 7/8 kw after about 25-30 mins of 17/18 kw.

So I don’t feel ambient temp is a major factor for me.