I am looking to implement monitoring of my immersion heater to make the figures for my heat pump monitoring a bit more reflective of all power usage (not just the ASHP unit).
I have a solar diversion setup with the Myenergy Eddi and am currently trying to decide would it be better to have the electric meter (SDM120M) on the output side of the Eddi (variable voltage / current based on the available solar and can be off for long periods (This does not seem ideal…) or on the Input side, where it will also account for the background usage of the Eddi.
The setup is wired that the disinfection cycle will trigger the Eddi (via the relay board voltage sensing) and any export over 1.5kw triggers the heat pump to run (again via the relay board). The power for the immersion heater all comes via the Eddi regardless with the heat pump power source only being used as a voltage trigger and not for any actual power draw.
In think having the meter before the Eddi and monitoring all input and then disregarding the background draw would be the most sensible way to install but I am looking for any other opinions or Ideas that I may not have considered.