Adding a 2nd Tesla home charger and tapping the wires.

[hemiarch]

If the chargers pull more than 60A, the breaker trips.
With a 60A breaker and a 48A both feeding the circuit, you need over 108A before anything trips.

ahh. That makes sense. Breakers don’t work in both directions? I’m honestly asking because I don’t know.
Also, there is a master breaker involved as well isn’t there?

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[hemiarch]

I think we can all agree it’s about time this was more than theoretical for Cybertruck and powerwall owners though. It’s seriously my biggest frustration with Tesla right now.

 

[hemiarch]

If the chargers pull more than 60A, the breaker trips.
With a 60A breaker and a 48A both feeding the circuit, you need over 108A before anything trips.

Wait. I’m making myself crazy thinking about this @mongo. Don’t understand how that’s possible. If you’re in PowerShare with a powerwall 3 or gateway that means you’re by necessity isolated from the grid. It’s basically a fancy transfer switch.
Don’t think there is a scenario where grid power and PowerShare power (juice from the trucks charging port) are combined.
So if truck port power maxes out at 48amps, where would you get the extra electrons for 108amp?
Potentially PV i guess but that’s a completely separate dc input pre-inverter.

 

[mongo]

Wait. I’m making myself crazy thinking about this @mongo. Don’t understand how that’s possible. If you’re in PowerShare with a powerwall 3 or gateway that means you’re by necessity isolated from the grid. It’s basically a fancy transfer switch.
Don’t think there is a scenario where grid power and PowerShare power (juice from the trucks charging port) are combined.
So if truck port power maxes out at 48amps, where would you get the extra electrons for 108amp?
Potentially PV i guess but that’s a completely separate dc input pre-inverter.

Right, no grid, but Powerwall puts out X amps through the WC breaker
Truck puts out 48A through the wall connector.
If the truck is at the end of the run (default if it's the only thing), then the wires can't get more than either end supplies (fault itself can).
If its 60A -> truck -> something else, then that something else can pull 108A.

 

[hemiarch]

But surely the system is smart enough not to discharge the powerwall at the same time as the truck no?

 

[mongo]

But surely the system is smart enough not to discharge the powerwall at the same time as the truck no?

Sure, it could, and theoretically the house should be able to run off PW only, but isn’t combined output part of the point of having both? Especially in a multi-Powerwall system or PW3 with solar.

System wise, I expect the asset controller to give the truck a time limited power commands with the Powerwalls making up the difference.

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