have just installed an emontx and emonpi with 4 CT’s. I originally planned to monitor grid power, solar, hydronic heat pump and HWS heat pump. I was then going to be able to calculate total house consumption as grid-solar, as well as monitor the consumption of the heat pumps directly.
I had assumed single phase power, and was rather embarrassed to find I actually had 3 phase power when the electrician arrived to install the CT’s behind the switch board.
I decided to skip monitoring the grid connection, and instead monitor the induction stove and oven consumption, as they were fed off one phase, and are the other major source of energy usage. The heat pumps were on another phase and the solar on yet another. The 9v supply was on the same phase as the solar.
I then realised that due to the phase shift between the 9V supply phase and the others, the power was out by a factor of 2 for the heat pumps and stove/oven. I fixed this in the feed with a x2 multiplier.
Thought this may be of interest to others with a similar set up.
[Edit: The “solution” in the final sentences above is likely to give false readings, and is not a recommended solution. - Moderator (RW) ]