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Three sets of AC terminals — GRID, Backup and GEN — with identical installation steps and one phase-order rule that decides whether the machine syncs at all.
DANGER — verify 0 V AC at all conductors with the OCPDs open before touching terminals.

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Phase sequence

Terminal labels read W(L3) · V(L2) · U(L1) · N · PE on all three ports. Match each terminal to the utility’s actual phases and verify rotation with a rotation meter — wrong rotation blocks grid sync and raises phase alarms.

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Cables and torque

Kent G3 AC grid and backup terminals — figure KNB-G3-CR-06

  • Strip 13 mm, crimp R-type connectors, bolt down with a torque wrench.
  • Terminal maximum temperature is 85 °C — heat at a terminal means workmanship, not load.
  • The backup loads panel must not be electrically connected to the main service panel.
4–5 N·m is this platform’s AC torque. Crews coming from the Kent M1 must not carry its much lower connector torque here — and must not bring this figure back there. Side-by-side values live only on the Mixed-Fleet Cheat Card.

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Size for pass-through + charging, not output

The grid side carries battery charging and up to 50 A of continuous AC pass-through to backup loads. Grid-side max input current is 22.8 / 27.3 / 34.2 A per phase (10/12/15 kW) with grid-side input power up to 15 / 18 / 22.5 kW — about 1.5× the inverter’s own rating. Cable and OCPD are sized to these input figures plus local code, never to the output kW alone.

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Backup behaviour to know while wiring

  • Transfer < 10 ms class; overload 2× rated power for 10 s; max phase imbalance 50 %.
  • Per-phase promises follow the platform’s unbalanced-output rules — see Settings Reference and [KNB-VAL-06].

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Common mistakes

  • U and W swapped “because the colours matched” — rotation meter, always.
  • Grid OCPD sized to 15 kW output on a 15 kW unit that draws 34.2 A per phase charging.
  • Backup subpanel bridged to the main panel during “testing” and never removed.
  • Terminals torqued by feel — 4–5 N·m is a torque-wrench number.

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When to escalate