Something in my house is sucking a *lot* of energy and I would like to find it and make it stop doing that. Anyone have specific recommendations for multi-circuit power-usage-tracking devices? (I have 13 240V and 18 120V circuits across three panels, suggesting I will probably need three such devices; the most populated panel has 10 120V and 2 240V.)

Other requirements: ideally #homeassistant compatible, not internet based (currently have devices on zwave and non-internet-facing wifi, adding zigbee soon for unrelated reasons), works with normal US split phase power. Assume I am a reasonably competent electrician and am comfortable putting a current transformer around a wire.

#homeautomation

@emily you dont need all that smart stuff for all your groups. If you have just one central meter that has realtime current usage. Just disable one by one your groups and write down the differences.

Next to that you might have a big aquarium, sauna, 60 inch television, heater, old airco,and so on.
What is your average kWh usage per month? What is your usage in watts during any moment when you go to bed?