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The Kent M1 has three AC connections — GRID, GEN and BACKUP — with L/N/PE marked inside each connector. This page gives the cables, torque, breakers and the one sizing rule installers most often get wrong.
For trained/authorized installers only. Verify all AC sources isolated and proven dead before touching terminals — see Isolation & Shutdown.

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Before you start

  • Grid and backup runs identified, labelled at both ends, and kept separate — the backup loads panel is never electrically tied to the main panel.
  • Every inverter gets its own AC protection switch — never shared, and no load may sit between the inverter and its AC breaker.

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Cables and torque

Kent M1 AC grid and backup terminals — figure KNB-M1-CR-06

Cable OD range: GRID Φ11–16 mm (3 kW) / Φ13–18 mm (5–6 kW); GEN and BACKUP Φ10–15 mm. Strip to the connector gauge, land the full core — no exposed copper outside the terminal, no strands left out (terminal heating destroys inverters).
1.2 N·m is this platform’s AC torque. It is deliberately low — these are compact connectors. Crews coming from other Kent platforms must not carry their torque habit here; see the Mixed-Fleet Cheat Card.
Order: connect the GRID and GEN PE first, then L and N. The BACKUP PE must be grounded — see Earthing & RCD. Seal every AC connector’s waterproof cover after wiring.

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The grid-input sizing trap

Grid-side cable and breaker are sized to the input figure, not the output rating: the grid also charges the battery, so grid-side apparent power reaches 6000 VA (3 kW) and 10000 VA (5–6 kW) with max input current 27.3 A (3 kW) and 43 A (5 and 6 kW). Sizing from “5 kW output” undersizes a 5 kW site by almost half.

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Breaker schedule

Kent M1 recommended breaker ratings — figure KNB-M1-CR-12

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Backup honesty

Backup output is per-model: 15 / 25 / 30 A max and 3300 / 5500 / 6600 VA. Size the essential-loads panel to the model figure.
Pending Kent validation — do not configure in the field. [KNB-VAL-02] Backup surge capacity for Kent M1 is under confirmation. Until published here, size backup loads to rated power only (3300 / 5500 / 6600 VA) and do not promise motor-start headroom.

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Common mistakes

  • Grid supply landed on the BACKUP port — this destroys the internal transfer switch.
  • Grid cable and breaker sized to output kW instead of the 27.3 / 43 A input figures.
  • A shared “solar breaker” feeding two inverters.
  • Over-torqued AC connectors cracked at 4+ N·m by habit from other platforms.

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When to escalate