Lucid Gravity gaining access to Supercharger network, Air access planned for Q2 2025

[msaunders9430]

Part of my excitement with buying the Gravity as my first ev, apart from the ev itself, has been also learning about the basics of how charging works with EVs.
My oldest son is an electrical engineer, but I'm enjoying learning this stuff on my own and kinda impressing him.
It's been fun.

I have question that I think I know the answer to, but need confirmation.
I've been researching online and reviewing the basics of electricity with The Engineering Mindset basic electricity video series on YouTube.

The question relates to something that Emad Dlala said in a State of Charge video interview about the new access to Tesla superchargers that Gravity has.
Around the 31:25 minute mark to the 34:31 mark Tom asks Emad about the voltage range of the 926 volts of the Gravity.

Emad eventually responds with an answer of 800v as the max voltage.
I'm thinking that is 800v that a 1000v EA charger would send to a Gravity.
Emad says 800v with 500 amps to get the 400kw max.

I've learned that home ev chargers use 80% of the amperage from a home circuit (e.g. 80% of a 60 amp circuit results in 48 amps used by the charger).
The 80% limit is to protect the charger from overheating.
My question: 800v is 80% of 1000v; is the 800v max (mentioned by Emad) from a 1000v charger limited for the same 80% reason as a home charger?
The voltage fluctuates as needed which is one reason for the famous "charging curve"?

Here's the video.

Or is 800v the max that Gravity would pull from the charger?

 

[Adnillien]

My question: 800v is 80% of 1000v; is the 800v max (mentioned by Emad) from a 1000v charger limited for the same 80% reason as a home charger?
The voltage fluctuates as needed which is one reason for the famous "charging curve"?

DC fast chargers do follow similar NEC codes for their grid connection as home AC chargers but the 800V referred to by Emad is not a derating. DC fast chargers have a three maximum ratings on the cabinet, maximum voltage, maximum current and maximum power. Those ratings are not subject to additional derating. Typically max power is less than max current multiplied by max voltage. Gravity will charge at the battery voltage which we know is below 800V at low SOC and 926V at 100% SOC. 800V and 500A are easy numbers that calculate to 400 kW, that is why Emad used the numbers. At an SOC where the battery voltage is 800V, if all other conditions permit, Gravity would be pulliing 500A and 400kW. So it is also a realistic example.

 

[msaunders9430]

Typically max power is less than max current multiplied by max voltage

Do you mean max voltage multiplied by max current?
From what I've been learning "power is voltage times current".

 

[Elfin]

Part of my excitement with buying the Gravity as my first ev, apart from the ev itself, has been also learning about the basics of how charging works with EVs.
My oldest son is an electrical engineer, but I'm enjoying learning this stuff on my own and kinda impressing him.
It's been fun.

I have question that I think I know the answer to, but need confirmation.
I've been researching online and reviewing the basics of electricity with The Engineering Mindset basic electricity video series on YouTube.

The question relates to something that Emad Dlala said in a State of Charge video interview about the new access to Tesla superchargers that Gravity has.
Around the 31:25 minute mark to the 34:31 mark Tom asks Emad about the voltage range of the 926 volts of the Gravity.

Emad eventually responds with an answer of 800v as the max voltage.
I'm thinking that is 800v that a 1000v EA charger would send to a Gravity.
Emad says 800v with 500 amps to get the 400kw max.

I've learned that home ev chargers use 80% of the amperage from a home circuit (e.g. 80% of a 60 amp circuit results in 48 amps used by the charger).
The 80% limit is to protect the charger from overheating.
My question: 800v is 80% of 1000v; is the 800v max (mentioned by Emad) from a 1000v charger limited for the same 80% reason as a home charger?
The voltage fluctuates as needed which is one reason for the famous "charging curve"?

Here's the video.

No, the voltage of DC fast chargers is the actual battery voltage*. When the battery is at 0% it's probably around 700V and it's 926V at 100%.
*unless it's charging on DC fast charger that can't supply the battery voltage, such as a V3 Supercharger. In that case there is a DC-DC presents a supported voltage to the charger and converts it to the battery voltage.
The charging speed decreasing as the battery gets full is a limitation of the battery chemistry. Though if you look at charging curves of Rivian and Hyundai/Kia they actually increase in power in the first half of the charging curve. This is because they are limited by the current so as the voltage of the battery increases (as it fills up) the power increases (Power = Voltage x Current)

The 80% limit is just part of the National Elect Code rules for continuous loads. The outlets and wires for a 50A outlet aren't designed to provide 50A for hours at a time.

 

[msaunders9430]

Do you mean max voltage multiplied by max current?
From what I've been learning "power is voltage times current".

Thanks @DeaneG for the confirmation.
For a minute I thought I was lost.

 

[msaunders9430]

No, the voltage of DC fast chargers is the actual battery voltage*. When the battery is at 0% it's probably around 700V and it's 926V at 100%.
*unless it's charging on DC fast charger that can't supply the battery voltage, such as a V3 Supercharger. In that case there is a DC-DC presents a supported voltage to the charger and converts it to the battery voltage.
The charging speed decreasing as the battery gets full is a limitation of the battery chemistry. Though if you look at charging curves of Rivian and Hyundai/Kia they actually increase in power in the first half of the charging curve. This is because they are limited by the current so as the voltage of the battery increases (as it fills up) the power increases (Power = Voltage x Current)

The 80% limit is just part of the National Elect Code rules for continuous loads. The outlets and wires for a 50A outlet aren't designed to provide 50A for hours at a time.

Ok.
I think I get what you're saying.

 

[Adnillien]

Do you mean max voltage multiplied by max current?
From what I've been learning "power is voltage times current".

yes

 

[HC_79]

Looks like 1000V V4"s will start coming online in Q3. Probably also explains why Lucid was in no rush to get the Air on the SC network until Q2. If they can get adaptors available etc. then it would tie in to a Q3 launch of the true V4 supercharger given the limitations the Air has on the V3's.

Tesla looking to deploy 500kW V4 Superchargers at less than $40k/stall

Tesla already operates one of the most expansive and reliable electric vehicle charging networks in the industry.

www.teslarati.com

 

[DeaneG]

Also, some other EV charging companies are beginning to roll out NACS connectors on their newer 1000V DCFC charging installations. We won't be limited to Tesla sites for 1000V NACS.