Looking at your earlier posting you say you have an EDMI ES12B meter - looking at their description so from my understanding since it's a 5-terminal meter you actually have a meter for Economy 7, which physically switches your circuits between day and night usage (ie night storage heaters for instance) and therefore has two "total" registers: one for each circuit - is that correct?
Just a point of clarification - there may be two registers, but this has nothing to do with having two circuits. There is only one recording element, so all power drawn at any one time can only go on one register, regardless of circuit.
There are a few rare smart meters with 2 recording elements that can bill different circuits on different rates at the same time - typically where stored heat is at one rate, household day at another and household night at another.
Again, there is nothing stopping this meter being configured with a single register, 48 or any number in between. The switching of the 5th terminal is independent of the rate registers, but you’d like to think they were synchronised when on economy7 (there is plenty of scope for this to be messed up though…)
