Add an energy monitor downstream of an existing monitor

Energy
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1

Scenario:

  • I have a Shelly EM measuring grid energy consumption
  • I have a wall socket in my office measuring a subset of this energy consumption
  • I have a power strip from this wall socket from which several other devices (including a PC) are powered
  • I have an available energy monitoring smart plug

Intent
I want to know the energy usage of my PC by introducing a smart plug downstream of the already monitored wall socket

Constraint
I want to avoid double counting energy usage

Future Use
I want to be able to add other energy monitors downstream of the wall socket with minimal configuration

I have looked at the HA Energy documentation and can’t find a description of this use case.

I assume this has been solved before, any suggestions?

I’m considering configuring a new sensor (Wall Socket - Exc monitored) calculated based on
– (Wall total increasing) - (downstream monitor total increasing)
I haven’t yet worked out the implementation details of how I would put this together, but is this a sensible plan?

2

You’re on the right track. Look up how to create a template energy sensor.

(basically you’ll create a synthetic sensor based on the result of the other two then monitor that sensor)