Some notes as I go along. We have A Renault Zoe A Growatt hybrid solar/battery system An OpenEVSE charger HomeAssistant instance An MQTT broker The challenge is to get all of those talking together so that when the growatt battery is full and the sun is shining, any excess solar goes into the car rather than the grid. It’s a little confusing as OpenEVSE seems to push OpenEnergyMonitor as the way to do all of this.