Shelly EM has a CT clamp that can be put on the main tails from the ESB meter to the fuse board this can be done in side the fuse board and the Shelly EM also needs to be wired to the mains. I have mine wired to the MCB/RCD/RCCB that feeds one of the lighting circuits in my house
For ESB, after trying to get data from ESB itself and process it in HA via InfluxDB+Python I turned to Frient device which works great for the Smart Meter used in Ireland by ESB Networks, it worked out of the box and super easy to install, uses ZigBee (so needs Zigbe2MQTT) and battery last 2 years
In situ:
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This looks to be exactly what I want, have you had any issues with accuracy? the device reading missing usage?
Its seems extremely accurate over 2 weeks in now - I turn a 1800Kw oven and its reflected within seconds (it checks every 5sec) - Highly recommend - about 50e on Amazon UK
Think I will go grab one. I current have my zigbee network using ZHA though. I don’t particularly want to change that but I do see others have used it with ZHA. Did you have to configure the pulse rate?
As I was looking into how to get the grid energy usage data and I stumbled into another way:
If you have an EV charger with a HA integration you might have an entity that shows the power you received from the grid.
I have a Hypervolt EV charger and it comes with a lot of power entities (in W) (Grid, Home, EV, generation). I used the “Grid Power” entity and the Integral sensor integration (see docs) to convert from W to kWh so it can be added to the Energy dashboard.
This is my configuration:
