Tesla Wall Connector: Calculate EV charging cost using Home Assistant

Tesla’s Wall Connector (3rd Gen) does not have a integration in the Tesla App and while the cost for your monthly charge can be displayed as part of the car’s charging details, it does not exactly do a great job of displaying details and stats. Since I’m running Home Assistant, I’ve integrated some sensors to read the energy consumption of the Wallbox and set up some automations to notify me about ongoing costs and to provide a monthly summary.