The C port is only used for a 3 phase setup. If you want to measure bi-directional power, that only option is using a 2nd Vue – and the mains clamps.
Emporia has claimed this could be added at some point (also an issue for solar and night-time vampire inverter / microinverter draw), but this is going on 2 years now and they don’t seem to be addressing system shortcomings – let alone new features.
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This reply was modified 1 year, 10 months ago by djwakelee.