Skip to main content
The Kent G3 senses grid flow with three CTs (or the meter scheme). Placement, direction, phase mapping and ratio all have exact rules — and the ratio depends on which kit shipped.
For trained/authorized installers only. Isolate the AC conductors before clamping CTs.

​
The CT rule

Kent G3 CT installation — arrow toward the grid — figure KNB-G3-CR-07

  1. The in-box CT set is compulsory for a hybrid installation (unless the meter scheme is used).
  2. Clamp each CT on its phase’s hot line at the system grid connection point — never on a load branch.
  3. The arrow on the CT points toward the grid — the universal Kent rule. The source manual is blunt: installed in the wrong direction, the hybrid cannot work normally.
  4. Each CT on its matching phase: the L1 CT on the L1 conductor, and its leads on the CT-L1 terminals — likewise L2 and L3.

​
Wiring the CTs to the 16-pin block

Lead the CT wires through COM3 (2 mm holes) to the 16-pin terminal block: WHITE (S1) to pins 1 / 3 / 5 and BLACK (S2) to pins 2 / 4 / 6, for CT-L1 / CT-L2 / CT-L3 respectively. Strip 9 mm, spring-clamp, and tug-test every conductor.

​
Which kit — and which ratio

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. The HMI’s “default 3000” text belongs to the meter-scheme CT — the box-kit CT is ratio 2000. Never assume.

​
Meter scheme wiring

  • Meter RS485 lands on the inverter Meter RJ45: RS485A on pin 1, RS485B on pin 2; on the meter side, pin 13 = RS485B and pin 14 = RS485A.
  • If CTs are connected, the smart meter is not essential — choose one scheme per site.
  • Meter installation location is selected at commissioning (Grid side / Load side / Grid+PV inverter) — see Commissioning.

​
Wrong-CT symptoms

  • Import/export signs flipped or the display showing fast power fluctuation → check CT direction first.
  • One phase importing while another discharges → CT-phase mismatch (L1 CT on L2, etc.).
  • Load reads 0 W → CT around two conductors at once.
Witness test at commissioning: grid on, PV off → import on all three phases; then step a known load per phase and watch each phase respond. 📷

​
Common mistakes

  • Ratio 3000 typed in for the box-kit 2000 CT — power wrong by a large factor. [KNB-VAL-08]
  • CTs on the right phases but leads landed on the wrong CT-L terminals.
  • CT leads extended with random cable beyond the supplied 1 m design.
  • Meter A/B swapped — meter comm fault, no grid data.

​
When to escalate