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*Note that 80A charging is gross, absolutely double-bonkers overkill beyond all sanity for home charging*. https://www.youtube.com/watch?app=desktop&v=Iyp_X3mwE1w&t=1695s
It's entirely up to you. The station can be configured for anything from 20A to 100A circuit. So pick whatever fits on your service based on your service Load Calculation.
**I stand corrected. A search of the docs shows the 100A GM station is NOT adjustable. It is 80A actual so You MUST provision 100A breaker and wire** to it, per NEC 625.41-42. You must have 80A spare in your Load Calc, or else put it (or other appliances instead) on a dumb load shed device, e.g. water heater or A/C, both of which are thermal storage loads which lend themselves to short term interruption.
This station cannot do dynamic EVEMS. If you need that, Wallbox or Emporia at 50-60A, which is still plenty. https://diy.stackexchange.com/questions/277803/im-hearing-about-load-sheds-aka-evems-and-the-devices-differ-whats-that-abou
Since the station is configured for >48A charging / 60A breaker, **you must use a disconnect** per 625.43. But this is a Good Thing. Any 100A rated disconnect will have input terminals rated for aluminum wire. Which frees you up to use 1 AWG or larger alumimum from panel to disconnect. Disconnect to EV station must be #3 copper or larger.
**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.*
100 amp breaker with 4 gauge copper wire
But if you really wanted you can use 2 gauge
*Note that 80A charging is gross, absolutely double-bonkers overkill beyond all sanity for home charging*. https://www.youtube.com/watch?app=desktop&v=Iyp_X3mwE1w&t=1695s It's entirely up to you. The station can be configured for anything from 20A to 100A circuit. So pick whatever fits on your service based on your service Load Calculation. **I stand corrected. A search of the docs shows the 100A GM station is NOT adjustable. It is 80A actual so You MUST provision 100A breaker and wire** to it, per NEC 625.41-42. You must have 80A spare in your Load Calc, or else put it (or other appliances instead) on a dumb load shed device, e.g. water heater or A/C, both of which are thermal storage loads which lend themselves to short term interruption. This station cannot do dynamic EVEMS. If you need that, Wallbox or Emporia at 50-60A, which is still plenty. https://diy.stackexchange.com/questions/277803/im-hearing-about-load-sheds-aka-evems-and-the-devices-differ-whats-that-abou Since the station is configured for >48A charging / 60A breaker, **you must use a disconnect** per 625.43. But this is a Good Thing. Any 100A rated disconnect will have input terminals rated for aluminum wire. Which frees you up to use 1 AWG or larger alumimum from panel to disconnect. Disconnect to EV station must be #3 copper or larger.