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The Kent G3 senses grid power flow with three CTs — or with the optional meter scheme. Placement direction, phase mapping, and ratio setting all have exact rules, and the correct ratio depends on which kit shipped with your unit.
For trained and authorized installers only. Isolate the AC conductors before clamping the CTs.

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The CT Rule

1

Use the in-box CT set

The in-box CT set is compulsory for a hybrid installation unless you are using the meter scheme. Do not substitute CTs from another job.
2

Clamp on the grid hot line

Clamp each CT on its phase’s hot line at the system grid connection point — never on a load branch or sub-circuit.
3

Arrow toward the grid

The arrow on the CT must point toward the grid. Installed in the wrong direction, the hybrid cannot operate normally. This is the universal Kent CT rule across all platforms.
4

Match phase to phase

The L1 CT goes on the L1 conductor with its leads on the CT-L1 terminals. L2 CT on L2. L3 CT on L3. Phase-to-CT mismatch causes single-phase import or discharge errors.

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Wiring CTs to the 16-Pin Block

Route the CT leads through COM3 (2 mm holes) to the 16-pin terminal block inside the wire box.
CT lead colourConnects toPins
WHITE (S1)CT-L1 / CT-L2 / CT-L31 / 3 / 5
BLACK (S2)CT-L1 / CT-L2 / CT-L32 / 4 / 6
Strip 9 mm. Use the spring-clamp method and tug-test every conductor after seating.

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Which Kit — and Which Ratio

KitContentsCT ratio to set
CT scheme (in box)100 A/50 mA CTs, 2.3 mm² × 1 m leads2000
Meter schemeThree-phase meter + 120 A/40 mA CTs3000 — set on the meter
Parallel > 3 unitsSeparate kit: meter + 300 A/5 A CTsPer kit nameplate
Pending Kent validation. [KNB-VAL-08]The 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 value. The HMI default text of “3000” belongs to the meter-scheme CT — the box-kit CT ships at ratio 2000. Never assume the default is correct for your kit.

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Meter Scheme Wiring

If you are using the meter scheme instead of CTs:
  • Meter RS485 connects to the inverter’s Meter RJ45: RS485A on pin 1, RS485B on pin 2.
  • On the meter side: pin 13 = RS485B, pin 14 = RS485A.
Choose one scheme per site — CT scheme or meter scheme, not both. Meter installation location (Grid side / Load side / Grid + PV inverter) is selected during commissioning.

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Wrong-CT Symptoms

If you see any of these, stop and check the CTs before proceeding:
  • Fast power fluctuation on the display — check CT direction first.
  • Import/export signs are flipped — CT installed backwards.
  • One phase importing while another discharges — CT-phase mismatch (L1 CT on the L2 conductor, for example).
  • Load reads 0 W — CT clamped around two conductors simultaneously.
Witness test at commissioning: with grid on and PV off, confirm import on all three phases. Then step a known resistive load per phase and watch each phase respond on its own. Photograph the result. 📷

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Common Mistakes

  • Typing ratio 3000 for the box-kit 2000 CT — power readings wrong by a large factor. Read the nameplate; see the kit validation note above.
  • CTs on the correct phases but leads landed on the wrong CT-L pins on the block.
  • CT leads extended with random cable beyond the supplied 1 m design length.
  • Meter RS485 A and B swapped — meter comm fault, no grid data.