Those are good questions, but the answers are kind of unclear and muddy, and unsurprisingly, the problems are because of differences between how Tesla promised the feature would work, versus what it actually does in implementation. It was supposed to be this very active and dynamic and full-featured thing, which would do the following:If I use the Lectron Tesla to J1772 adapter to allow for non-Tesla vehicles to charge is is going to work? Adapter link
I think the question is really more something like :
The electrician I was talking with seemed to say that using an adapter would prevent the charger to talk with the vehicle and so it would not work, but honestly he did not seem too sure and just wanted to be on the safe side.
- Is the Wall Connector itself discovering the required power of each vehicles
- Is the vehicle supposed to request an amount to "ask" the charger
- Is the charger (Wall Connector) required to actually negotiate with the car to handle power sharing? (In which case, yeah I see using an adapter might be a problem)
Two-way communication with all of the cars to detect their states of charge as inputs.
Shifting the amounts of amps around frequently and dynamically.
Giving priority to refilling the car with lowest state of charge sooner.
But in implementation, people have reported several behaviors that aren't that.
One thing seems to be a limitation in the J1772 protocol that it uses. Any vehicle that is plugged in has 6A allocated to it always, even if it's not being used. So if two cars are plugged in with 48A available, there are 6A set aside not being used for a full car, while the other can only get 42A at most.
The dynamic shifting of amps from more going into the emptier car toward more even split I don't think has ever worked. The best people have seen is just a simplistic 1/N splitting among the N number of wall connectors.
And then I think there are still problems where it won't reallocate once one of the cars hits full and stops charging. So two cars were getting 24A each, but when one car hits full and stops, the other car stays stuck at 24A unless someone goes and unplugs the full car to give a kick to the head to the system to make it look at what it is supposed to be doing again.
Fortunately, that seems to be a problem it has NOT had. As far as I have heard, all of these behaviors are still honoring the total limit of the entire system, and I haven't heard of any installations of them overshooting that. They just aren't being as cool and smart about the allocation as they were supposed to be.However, I would say that if it doesn't honor the splitting of the charge it would be a danger to use and thus I would have to assume it works. Of course, assume but verify