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The Kent M1 senses grid flow with the in-box CT or a supported meter. Get placement and direction right here, and zero-export, self-use and the energy display all behave.
For trained/authorized installers only. Isolate the AC conductor before clamping anything around it.

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The CT rule

Kent M1 CT installation — arrow toward the grid — figure KNB-M1-CR-09

  1. Clamp the CT on the grid main L (live) conductor at the grid connection point — never on a load branch, never around L and N together.
  2. The arrow on the CT points toward the grid — the universal Kent rule on every platform.
  3. Close the CT cap until it clicks; land the leads on CT+ / CT− of the 16-way strip.
The LCD Advanced page holds Meter CT orientation (towards the grid) and CT Ratio — set the ratio exactly to the shipped CT’s nameplate.
Pending Kent validation. [KNB-VAL-08] The shipped CT scheme and ratio per Kent SKU are under confirmation. Until published here: read the ratio off the shipped CT’s nameplate and set exactly that — never assume a default.

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Meter option

Where a meter is used instead of (or with) the CT, the supported models in the source manual are: DDSU666 (single-phase, 2P 1CT), DTSU666 (three-phase, 4P 3CT or 4P 6CT), and ADL200N-CT / ADL400N-CT / ADW200-D16-2S. Wire meter RS485 A → METER(A) and B → METER(B) on the strip; on the three-phase meter’s RJ45 view, A maps to pin 3 and B to pin 6. Follow the wiring figure for the exact meter model and CT count — position and direction errors show up as wrong power and energy. For AC-coupled retrofits: single-phase homes use a 3-CT meter with CTA on the grid and CTB on the existing solar inverter; three-phase supplies use the 6-CT scheme.

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Wrong-CT symptoms

  • E106 (CT abnormal) and E107 (CT reverse) flag CT miswiring directly on the LCD.
  • Load reading 0 W → CT clamped around L+N together.
  • Import/export signs flipped, battery discharging to the grid → CT reversed or on the wrong conductor.
Witness test at commissioning: with grid on and PV off, the display must show import; then step a heavy load and watch the sign. 📷

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Common mistakes

  • CT on a sub-circuit “because the main was hard to reach” — control logic goes blind.
  • Ratio typed from memory instead of the CT nameplate. [KNB-VAL-08]
  • Meter RS485 A/B swapped — meter comm fault, no grid data.
  • CT lead extended with random cable — keep the run within the supplied lead’s design.

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When to escalate