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I just bought a second EV that uses a J1772-type connector, which I need to park outside (in the driveway). I also have a Tesla (NACS connector) that I park in the garage, where I have a Tesla Wall Connector on a 60A circuit.

Since the Tesla Wall Connector won't reach the new car, I'd like to install a second EVSE outside for the second EV, but I don't want to add another 50-60A to my main panel's load calculation*. Because the second car has a J1772 connector, I don't want to install another Tesla Wall Connector since I'd have to use an expensive adapter that costs almost as much as the EVSE itself.

I'm aware that some EVSEs can share a power allocation so they don't pull more than a certain amount of current (combined) at the same time, but I'm not sure if this is supported cross-vendor, or if there's a way to do it using some external device. What's a good way to do this across a Tesla Wall Connector (3rd gen) and another good J1772 EVSE?

* I'm aware that I can just add a second dedicated small circuit, e.g. 20A @ 240V, for the outside charger. If there are no other alternatives I might do that. But if there are, I'd rather charge faster / not have to charge every night, especially since I'm already dedicating 60A of my panel capacity for charging.

Harper - Reinstate Monica
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peter
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2 Answers2

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Why not get a Tesla Universal Wall Connector. $595 compared to $475 for the regular Tesla Wall Connector, so an upcharge of $120, which is quite a bit less than the gadget from Amazon.

manassehkatz-Moving 2 Codidact
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Negative Ghost Rider. Differing brands of EVSE ("charger") cannot intermix using Power Sharing.

The reason is that every manufacturer does it differently. Tesla's gen 2 Wall Connectors used hardwired RS422. Gen 3 Wall Connectors use a proprietary radio scheme. Wallbox uses a cat 5E to carry a CANbus-like signal. CrippleCreek used a clunky, proprietary 3-bit system to indicate charge level (which on the upside was fairly hackable).

However, since you're already in the gen-3 Tesla ecosystem, you might as well scrounge up NOS of the obsolete J1772 Wall Connector or the brand new Universal Wall Connector which replaces it. Both of these will interact properly with the modern gen-3 Tesla Wall Connector.

Harper - Reinstate Monica
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