WinterDragoness
Member
eMotorWerks recently announced that feature for their system. They introduced a new WiFi connected box called JuiceMeter that measures your solar output and communicates to a JuiceBox EVSE so that it can follow the solar generation. I've not tried it and I'm not affiliated with the company.
JuiceMeter - Universal Energy Meter
That's cool but I already have the Tesla Wall Charger. I actually figured out how to hack its two-wire load-sharing protocol to do what I want over here.