I would lover that too - maybe @coryhillmann would allow me to change the title a little to represent what you are asking for, since Sense already allow the Multiple 220/240V monitoring if you have the second ports available.
I can see three barriers to what you suggest, if you include cost:
-
Sense Setup for Mains CTs - The setup process has two interrelated issues that reduce current usability. Sense tries to combine the current / power for both, and therefore does a polarity / phase consistency check to make sure it is seeing two supplies that are the same polarity and opposite phase. You can get by this step by initially placing the CTs on your mains and then transferring them later. But Sense is still hardwired to combine the two so if you move the CTs to measure single legs of two different 240V circuits, you’ll need to make sure you are measuring opposite phases / legs and you don’t flip polarities, and even then you’ll only see both circuits combined in the Total Usage category, that you can’t rename. Of course the bubbles will be meaningless as well (especially Other and Always On), except for the bubbles coming from the second set of CTs operating in DCM mode. The alternate strategy that I would recommend is to try the mains of the second “DCM Monitor” on any unbalanced 240V loads you have in your house. Just turn the device on and go through the normal Sense setup process. You shouldn’t have any issues if you are monitoring both phases of singe 240V device, plus Sense’s built-in combining fits naturally.
-
Combining Data from Two Monitors and Accounts - There’s no direct way for your Main Sense monitor to incorporate the device data from the second monitor that is collecting up to 4 240V measurements (1 or 2 combined in Total Usage, plus 2 from the DCM CTs). To see usage combined, I would do two steps: 1) connect both your Senses to Home Assistant and combine there to double check, then 2) use SenseLink from Home Assistant to pipe the data (entities) from the second monitor back to the main Sense monitor.
-
Cost - Pretty expensive for 3-4 extra measurements. But Sense can’t do much about that without a whole different hardware scheme. The Sense monitor is fairly expensive to build because it uses some pricey chips inside that allow it to do the high speed sampling, plus so some realtime DSP (digital signal processing). @Ingo was just inside of his monitor so maybe he could commented on estimate BOM (bill of materials) cost. I’m guessing the onboard main processor/DSP and Altera CPLD are fairly expensive.