Home Automation
Home Assistant, local control, and automating things that probably didn’t need automating.
A living reference for adapting the ESP32 local inverter control build to other brands: what transfers as-is, what changes per brand, where to find register maps, and the quirks that bite.
My heat pump was invisible to the inverter and my EV charger was confusing it. Moving one CT clamp fixed the first problem with zero software; a small Home Assistant automation driving the part 1 ESP32 fixed the second.
Arduino / ESP32
Taking back your Growatt inverter: local control with ESP32 + Modbus (part 1)
Feb 21, 2026Wire a cheap ESP32 and RS485 transceiver to a Growatt SPH5000 inverter, flash ESPHome, and get a local Modbus web UI for monitoring and control. No cloud, no app.