Metering

The controller measures all three phases and neutral itself. Up to 63 A per phase the conductors go through it directly; above that it works from external current transformers.

Accuracy is ±0.2 % typical, Class 1 to IEC 62053-21.

Direction and phase order

A measurement that is correct in magnitude and wrong in sign turns every optimisation decision inside out — the controller will discharge the battery to "cover" a load that is actually export. Getting CT orientation and phase assignment right at commissioning is the single check that matters most.

The commissioning check — reading the per-phase values, and the built-in CT wiring test — is on Readings. The test only reports; a reversed or swapped CT is corrected in the cabinet, not in software.