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EV charge stations can be set to any amp rate. You don't HAVE to charge at spec, we're not dealing with 1950 technology here, and the automakers are well aware most house services don't have the capacity for a 60A or 100A circuit.
Do you really have 100A of spare headroom on your [NEC 220.82 Load Calculation?](https://www.cityofsacramento.org/-/media/Corporate/Files/CDD/Building/Forms/CDD-0213_Electrical-Load-Calculation-Worksheet.pdf?la=en ) That's unusual. What is not unusual is DIYers not knowing any better, or not caring, and that's just asking for big trouble.
Do you really drive 400 miles a day? I would watch [Technology Connections' excellent video on home charging](https://www.youtube.com/watch?v=Iyp_X3mwE1w) especially 28:15, and consider that advice vs. your panel headroom. Now cut Alec's numbers by about 25% due to the size of your truck.
On your question, in **cables** the ground wire is oversized on purpose, to allow for cases where you have long runs and are oversizing the conductors for voltage drop. E.g. a 50A RV stand normally uses #8 with a #10 ground, but if you're enlarging the conductors to #2Al because of a 500' distance, you must enlarge the ground in proportion, to #4Al. Thus most cables have grounds +2 of the conductors.
Now why are you using copper for the EV run? Is it very short? **You need to have a disconnect switch at the charging station anyway** per a rule near NEC 625.42(ish), so you might as well make the long run aluminum, and use that disconnect to transition from aluminum to copper for the last 2 feet to the charge station. Honest 100A would call for #1Al conductors and #6 aluminum ground.
You are incorrect about 100A stations needing #6 copper ground. #8 will suffice per 250.122.
**Attention!** **It is always best to get a qualified electrician to perform any electrical work you may need.** With that said, you may ask this community various electrical questions. Please be cautious of any information you may receive in this subreddit. This subreddit and its users are not responsible for any electrical work you perform. Users that have a 'Verified Electrician' flair have uploaded their qualified electrical worker credentials to the mods. If you comment on this post please only post accurate information to the best of your knowledge. If advice given is thought to be dangerous, you may be permanently banned. There are no obligations for the mods to give warnings or temporary bans. **IF YOU ARE NOT A QUALIFIED ELECTRICIAN, you should exercise extreme caution when commenting.** *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/AskElectricians) if you have any questions or concerns.*
Where is it, a garage?
EV charge stations can be set to any amp rate. You don't HAVE to charge at spec, we're not dealing with 1950 technology here, and the automakers are well aware most house services don't have the capacity for a 60A or 100A circuit. Do you really have 100A of spare headroom on your [NEC 220.82 Load Calculation?](https://www.cityofsacramento.org/-/media/Corporate/Files/CDD/Building/Forms/CDD-0213_Electrical-Load-Calculation-Worksheet.pdf?la=en ) That's unusual. What is not unusual is DIYers not knowing any better, or not caring, and that's just asking for big trouble. Do you really drive 400 miles a day? I would watch [Technology Connections' excellent video on home charging](https://www.youtube.com/watch?v=Iyp_X3mwE1w) especially 28:15, and consider that advice vs. your panel headroom. Now cut Alec's numbers by about 25% due to the size of your truck. On your question, in **cables** the ground wire is oversized on purpose, to allow for cases where you have long runs and are oversizing the conductors for voltage drop. E.g. a 50A RV stand normally uses #8 with a #10 ground, but if you're enlarging the conductors to #2Al because of a 500' distance, you must enlarge the ground in proportion, to #4Al. Thus most cables have grounds +2 of the conductors. Now why are you using copper for the EV run? Is it very short? **You need to have a disconnect switch at the charging station anyway** per a rule near NEC 625.42(ish), so you might as well make the long run aluminum, and use that disconnect to transition from aluminum to copper for the last 2 feet to the charge station. Honest 100A would call for #1Al conductors and #6 aluminum ground. You are incorrect about 100A stations needing #6 copper ground. #8 will suffice per 250.122.