@kevin1 I can’t clamp on the Grid mains because all that will tell me is how much power I am sourcing from mains, not what my total load is. My house can get sourced from Solar, PW, and Grid potentially all concurrently and as such, leads have to go on the house load side, not on any of the sources (except the solar ones go on the solar source to measure its production).
Up until this week, I only had 1 panel so it was fine. Further (to your point, @qrnef) I was not accounting for power being used to top up Powerwall because my leads weren’t in the gateway, only on the panel but I was ok with that as I was running Powerwall in backup mode really so it was just occasional top-up.
Now I have two panels and what I really need is 3 sets of CTs for one Sense (at least that makes sense - no pun). However, since there is no such beast, it appears as if I need 2 sense units unless there is some kind of Y connect to allow 2 sets of clamps into one input on the source but I suspect that is not possible and it is more complicated.