The setup everyone builds You have a three-phase supply and you want it in Home Assistant, so you do the obvious thing: three single-phase meters — a PZEM, a Shelly EM, an ATM90E32 board — one per pha...

You clip a current transformer around a wire, wire it into an ESP32, and Home Assistant lights up with watts and kilowatt-hours. Then you check it against the meter on the wall — and the numbers don't...