If you haven't purchased the HPWC yet, you may want to consider the 14-50 adapter instead - which is much easier to install.
While the HPWC can deliver up to 80A of charging, in practice, few owners ever need to charge with more than 40A to do overnight charging, event with a 100 battery pack.
The 14-50 adapter only requires a standard 14-50 outlet, which any electrician can easily do. Add a Tesla cable organizer for holding the cable, which is easy to mount yourself with two screws - and you're ready to charge.
We have an HPWC for one of our Model S cars and use a 14-50 for the other - and they both get a full charge overnight.