Lucid Gravity UX 3.6 is here!

[Smorgasbord]

I got that, but he is confusing that by the fact that 19.2 kW is slow in an absolute sense and is not a reason that the charge curve should degrade at high SoC. My original reply addressed that.

I am not confusing anything.

Go check out any of the other handful of cars (Porsche, Tesla, etc.) capable of L2 charging at 80amps AC and you'll find that none of them will draw the full 80 amps at 95% SOC.

This is because when DC Fast Charging, the battery's BMC tells the station what to send, and just the battery is involved. When L2 AC charging, the car's onboard charging equipment is engaged, and that generates additional heat beyond the battery. That heat has to be managed.

You're confusing the two different types of charging and assuming that only the battery's BMC is in control in both cases. That's not true for AC charging and so there's a different in kW sent at the same battery SOC with AC versus DCFC.

 

[PGT]

I stopped checking to see if I’ve got the update. Still on 3.5.7. Really slow roll out apparently

 

[exxxviii]

I am not confusing anything.

You kind of moved the goal posts a bit here... The original post was about 80A A/C charging, and that problem was charge rate dropping at a much lower SoC, around 60%. And you added the (inaccurate) blanket statement that "all charging rates drop as the battery gets full." This true at high charge rates, but not for very low charge rates, such as 19.2 kW. The person who wrote "AC charging should not reduce at any point" is more correct here, especially when the threshold in context was 60%.

Why would the car's onboard charger degrade the charge rate as the battery approaches 60% or 95% SoC? Those two are entirely independent. But most important, go back to the original premise, that people are witnessing degrading charge rates at a low SoC - this should not happen at a low charge rate.

 

[Lycra]

I am not confusing anything.

Go check out any of the other handful of cars (Porsche, Tesla, etc.) capable of L2 charging at 80amps AC and you'll find that none of them will draw the full 80 amps at 95% SOC.

This is because when DC Fast Charging, the battery's BMC tells the station what to send, and just the battery is involved. When L2 AC charging, the car's onboard charging equipment is engaged, and that generates additional heat beyond the battery. That heat has to be managed.

You're confusing the two different types of charging and assuming that only the battery's BMC is in control in both cases. That's not true for AC charging and so there's a different in kW sent at the same battery SOC with AC versus DCFC.

Audi etron sportback 55 (2022 model)

It sure does charge with full speed until 100% with out decreasing the speed.
AC should always without any compromise be at 100% charging speed.
If not, then there is a limit in software usually

 

[vipulpatel7]

You kind of moved the goal posts a bit here... The original post was about 80A A/C charging, and that problem was charge rate dropping at a much lower SoC, around 60%. And you added the (inaccurate) blanket statement that "all charging rates drop as the battery gets full." This true at high charge rates, but not for very low charge rates, such as 19.2 kW. The person who wrote "AC charging should not reduce at any point" is more correct here, especially when the threshold in context was 60%.

Why would the car's onboard charger degrade the charge rate as the battery approaches 60% or 95% SoC? Those two are entirely independent. But most important, go back to the original premise, that people are witnessing degrading charge rates at a low SoC - this should not happen at a low charge rate

Hi my car is going in service for this reason. I showed the lucid tech while he was fixing other issues about this and he said they have to take my car to the service center to fix the slow charging/derate issue.

 

[ke2]

Audi etron sportback 55 (2022 model)
View attachment 39569
It sure does charge with full speed until 100% with out decreasing the speed.
AC should always without any compromise be at 100% charging speed.
If not, then there is a limit in software usually

While the Audi may be able to charge at the full 20KW full time the Gravity likely won't be able to as even at a DCFC at around 95% SOC the KW being sent/received is below 20KW. Thus I wouldn't expect the AC charging to be doing 20KW at 95% SOC either. This is taken empirically as I watch the charging at a DCFC trying to "fill up the tank" the night before a long trip (I've done this multiple time BTW).

 

[vipulpatel7]

I do not have the expectation for it to charge at full 19kw at 95% but at low SOC it should charge at 19kw till 80%. I have 3 EVs and when it keeps derating It keeps extending the charging time. I spent $1700 for installation and $1200 for lucid charger, to get gravity charged up quickly and charge my other EVs after that. I know some of you will question why I need to charge quick because all 3 drivers in my home put on miles due to work requirement and sitting at a DC fast charger every day while working is not an option for me plus the travel time to a DC charger. Charging at 19kw shows 3 hours for my everyday needs, but it takes 5 to 6.5 hours depending on the derate speed.

 

[Smorgasbord]

you added the (inaccurate) blanket statement that "all charging rates drop as the battery gets full." This true at high charge rates, but not for very low charge rates, such as 19.2 kW.

It's not inaccurate, and 19.2kW is not a low charge rate for a Level 2/AC charging session. As I pointed out, there are only a handful of EVs that can charge at that high a rate.

The person who wrote "AC charging should not reduce at any point" is more correct here, especially when the threshold in context was 60%.

That's too funny, saying "at any point' and then "context was 60%." Those are different statements. If one wants to say "AC charging should not reduce at 60%," then fine I have no argument, but saying, as they did "AC charging should not reduce at any point" just isn't true.

Normally, L2 charge rates will reduce at very high SOCs depending on the BMC and when it engages cell balancing.

Audi etron sportback 55 (2022 model)

Do you have an actual link to the test, or just that highly suspect graphic? Did anyone here besides me notice the bottom scale? Here's a close up:

Yeah, the battery supposedly hits 100% well before halfway through the chart. That means they're claiming the battery is pulling at least 20kW AFTER the battery is already at 100% SOC. And well after considering more than half the chart is taken up with that! It makes no sense (where's all that juice going for so long?) and so I conclude the graph is suspect.

AC should always without any compromise be at 100% charging speed.
If not, then there is a limit in software usually

As I posted, with AC charging the OBC (On Board Charger) is engaged. Everything runs on software. As the OBC runs, it heats up, and I'm sure the software inside it is set to reduce current if it gets too hot. So, the question is whether the OBC hardware is functioning normally or not as well as whether the software has bugs. Heck, there could be problems with the temperature sensor(s) in the OBC. At 60%, if the OBC has been running a long time and the car is in the hot sun, then the system could decide to slow the charge rate down to protect itself.

But, no blanket statements such as "should not reduce at any point" or "always...be at 100% charging speed" are simply incorrect assertions.

 

[socktucker]

Yeah, the battery supposedly hits 100% well before halfway through the chart. That means they're claiming the battery is pulling at least 20kW AFTER the battery is already at 100% SOC. And well after considering more than half the chart is taken up with that! It makes no sense (where's all that juice going for so long?) and so I conclude the graph is suspect.

Common Core math, you wouldn't understand.

 

[Lycra]

It's not inaccurate, and 19.2kW is not a low charge rate for a Level 2/AC charging session. As I pointed out, there are only a handful of EVs that can charge at that high a rate.


That's too funny, saying "at any point' and then "context was 60%." Those are different statements. If one wants to say "AC charging should not reduce at 60%," then fine I have no argument, but saying, as they did "AC charging should not reduce at any point" just isn't true.

Normally, L2 charge rates will reduce at very high SOCs depending on the BMC and when it engages cell balancing.


Do you have an actual link to the test, or just that highly suspect graphic? Did anyone here besides me notice the bottom scale? Here's a close up:
View attachment 39575
Yeah, the battery supposedly hits 100% well before halfway through the chart. That means they're claiming the battery is pulling at least 20kW AFTER the battery is already at 100% SOC. And well after considering more than half the chart is taken up with that! It makes no sense (where's all that juice going for so long?) and so I conclude the graph is suspect.


As I posted, with AC charging the OBC (On Board Charger) is engaged. Everything runs on software. As the OBC runs, it heats up, and I'm sure the software inside it is set to reduce current if it gets too hot. So, the question is whether the OBC hardware is functioning normally or not as well as whether the software has bugs. Heck, there could be problems with the temperature sensor(s) in the OBC. At 60%, if the OBC has been running a long time and the car is in the hot sun, then the system could decide to slow the charge rate down to protect itself.

But, no blanket statements such as "should not reduce at any point" or "always...be at 100% charging speed" are simply incorrect assertions.

I use Tronity to track all our 6 evs charging and driving sessions. It is just the graph I have many more. All since we have the Audi since November 2022. Since we have a 85 kwp photovoltaik on our roof we usually have enough power to charge with solar only. So some graphs are below 19 kw because we mostly like using surplus only. However most of the graphs look like this I have also the actual protocol for each charge. So I can show the soc every minute or so and also show the time it took to charge etc. So one can calculate backwards.

 

[exxxviii]

Common Core math, you wouldn't understand.

However most of the graphs look like this I have also the actual protocol for each charge. So I can show the soc every minute or so and also show the time it took to charge etc.

It's not inaccurate, and 19.2kW is not a low charge rate for a Level 2/AC charging session.
...
Yeah, the battery supposedly hits 100% well before halfway through the chart. That means they're claiming the battery is pulling at least 20kW AFTER the battery is already at 100% SOC. And well after considering more than half the chart is taken up with that! It makes no sense (where's all that juice going for so long?) and so I conclude the graph is suspect.

Hint: The chart does not have a time scale. It is just showing SoC advancing, but it does not indicate time between each data point. I agree it is a funky view, but there is no indication that the charge was driving 20kW for several more hours after 100%.

If a car limits L2 charge rate at 60%, and probably even 90% or 95%, the cause is not battery constraint. It is either a poorly designed onboard charger or a poorly written charging algorithm. 19.2 kW is a very slow charge rate from a battery's PoV and not a cause for a battery-driven constraint. Maybe a 2012 Tesla Model S had problems, but this is not a thing in modern cars.

 

[240]

Hi my car is going in service for this reason. I showed the lucid tech while he was fixing other issues about this and he said they have to take my car to the service center to fix the slow charging/derate issue.

Nice…I have a service scheduled to fix this issue too

 

[Lycra]

Full speed until 100%. It shows data points because the car was not disconnected. Tronity still tracks until the charge is disconnected.
57.09 kWh was charged

 

[PGT]

arguing about charging speeds feels off topic here

 

[Lycra]

True, maybe a moderator can separated the posts into a new thread regarding AC Charging?!

 

[mlaviano]

Thanks for your response. I'm hoping mine will do the same. I drove it for 1½ hours this morning with no change. I'll be driving it for about 600 miles on I-95 next week. We'll see what happens. Fingers crossed

Update 6/26/2026: After driving a 3,000 mile road trip of which 75% was on Interstates, my Dream Drive 2 Pro is still unavailable and the newer menu items in settings are still not displayed.

 

[NoseyReporter]

From 55% to 89% holding 85A+.

I think it has something to do with duration. Somewhere around 3 hrs it suddenly will stop taking 19kw

 

[Dank]

I have a dream edition without the update

And I got a survey on how I like the update.

 

[DeaneG]

And I got a survey on how I like the update.

Contact customer care?

 

[Dank]

Contact customer care?

I did but messages going there go into the void in my experience.