Having recently bought the emonPi to test it with one circuit, I am very happy with it and I would like to extend it. In total, there are 13 circuits that I want to monitor, but they are distributed over 3 phases (4 on phase L1, 5 on L2 and 4 on L3, this is a 3-phase system with neutral connection). I was thinking of getting 3 emonTx stations, one connected with an AC-AC adapter to each phase and leave the emonPi on L2 to monitor the extra phase (since there are only 4 inputs in each emonTx). Is that a viable setup, or are there better options?
One extra complication is that one of the systems I want to monitor is a 3-phase heat pump. Is it possible to combine the readings from the 3 phases into one power reading?