Wall Charger Installation DCC-12 needed??

[Cybertruck 1974]

I have a contractor that wants to install this on my 2 powerwall, gateway, solar system in order to connect my Wall Charger. Has anyone seen this and had this done? According to Tesla it's not a part they spec and would be connecting the Wall Charger directly to subpanel of gateway. Any help would be appreciated.

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[CyberGus]

Seems like your electrician believes your main panel cannot support another 60A load.

Of course, I doubt this works with a bi-directional setup like PowerShare.