My wife just bought a VW ID.4 and we want to charge it on the same circuit I previously installed to charge my Model 3. Here are a few notes on what we did and how it's working:
I upgraded the Gen 2 HPWC to a Gen 3 and bought a second Gen 3. These were installed on Jan 3, 2021. We are using the TeslaTap Mini 60A to adapt the ID.4 and are getting a full 48A/11kW charge at a peak charge rate of 43mph. The two Gen 3 units were upgraded by the electrician with the required firmware add-on to enable load sharing. This setup, using the TeslaTap Mini 60 on the ID.4, is more flexible than installing a dedicated J-1772 connector. If we decide to switch how we park the cars, we can just move the adapter to the other HPWC.
The system uses one 60A branch circuit from the garage 100A sub-panel, the same circuit I previously used for my Gen 2 HPWC. We had the units installed by a Tesla-qualified electrician (same who did our previous installation). The buss connections for the two Gen 3 HPWCs are in a J-box installed near the sub-panel with no additional circuit breaker. All connections torqued as required by Tesla. Each Gen3 HPWC has GFCI protection in-built, so no GFI required on the branch circuit. Building inspector signed off the permit the following day. The two Gen3 HPWCs are joined to my home WiFi, to receive firmware updates. However, they communicate directly with each other, not via the home WiFi for load balancing. Home WiFi is not required, though firmware updates are tedious without it. All configuration and firmware add-on and update was performed by the electrician/installer.
When the TeslaTap Mini 60 is attached, it signals the HPWC to go into "J-1772" mode (according to the instructions). After a few seconds, the Tesla HPWC shows a solid blue light indication (not green). When charging the ID.4, the lights run top to bottom just as when charging a Tesla. When jacking into the ID.4, the car's charge indicator goes from white to green, then pulses while charging. When charging is complete, the Tesla HPWC returns to a solid blue indication.
When both units are connected to vehicles and requesting full power charge, the system splits 50/50 between the two cars... 24A for each vehicle. When either of them completes charging, the other vehicle gets the full 48A. I've seen all of these configurations and it is fully automatic and seamless.
The TeslaTap Mini 60 is compact and very well made. It is a quite tight fit to the Tesla handle, and there is a note in the instructions that this will be true. It was much tighter on my old Gen 2 HPWC than on the new Gen 3, but that is likely just random. Silicone spray lubricant was helpful (I used SailKote:
SailKote Marine Dry Lubricant & Coating for Sails, Rigging, Deck Hardware and more. - McLube) And we won't remove the TeslaTap Mini unless we travel long distance, so it isn't a daily chore.
There is a lock eyelet to prevent the Telsa connector from being detached from the TeslaTap Mini adapter. I intend to install a Chicago screw through this hole so we don't do this by accident (which I've done a couple of times already). And when traveling, a small lock can be installed to prevent the adapter from going missing from a destination charger.
tl;dr — This is exactly what we wanted: use our existing 60A circuit, add a second vehicle, dynamic load balancing, Tesla and non-Tesla with no special tweaking of menus in vehicles. It just works!