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The Kent M1 has two protective-earth points and both are mandatory. Skipping either one is not a shortcut — it creates shock risk and, on the backup port, causes the inverter to stop supplying backup loads during a grid failure. Complete earthing before you touch any other wiring on this platform.
For trained and authorised installers only. Earthing errors on this platform cause shock risk and backup failure — not just alarms.

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Before you start

  • Earthing is completed before PV, battery, or AC wiring — no exceptions.
  • Measure and photograph the earth pit per Earthing & Protection. Escalate poor soil resistance before energising.

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Dual PE — never only one

You must connect both protective-earth points on every Kent M1 installation:
1

System ground in the AC output connector

Land the PE conductor in the PE position of the GRID connector. This is the system ground path.
2

Chassis protective earth

Connect the chassis earth terminal using an M4×10 screw torqued to 1.2 N·m. Use 10 mm² outdoor single-core copper cable. After fitting, paint the chassis earth terminal for corrosion resistance.
Connecting only one PE point is forbidden. With multiple inverters on site, every unit gets its own independent earth connection — never daisy-chain chassis earths.
Use outdoor-rated, UV-stabilised green/yellow single-core copper at 10 mm². The chassis terminal screw is M4×10 — do not substitute a longer or shorter fastener.

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Backup-port PE

The BACKUP port PE must be grounded or backup will not operate during a grid failure. This is the single most expensive earth wire to forget — the customer discovers it only during their first power cut, which is exactly the wrong moment.
Do not leave the backup PE floating, even temporarily. The BACKUP port PE is a functional requirement, not just a safety requirement.

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Residual-current protection

The inverter has built-in residual-current detection and disconnects from the grid automatically when leakage exceeds its internal threshold. External RCDs are supported and recommended:
SideRCD typeRating
Grid sideType A100–300 mA (recommended)
Backup sideType A30 mA
Pending Kent validation — do not configure in the field. [KNB-VAL-04] Written confirmation of the backup N-E bond-relay behaviour and the approved RCD scheme is in progress. Until published here: follow the Kent N-E test in the commissioning checklist and never improvise an external N-E bond at the backup panel.
The Advanced menu contains an NPE Relay Check and an NPE voltage protection threshold — evidence of internal N-E supervision. Leave both at factory state unless a Kent parameter sheet instructs otherwise.

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Common mistakes

  • Landing one PE point and calling it done — dual PE is a hard rule on this platform.
  • Leaving the backup PE floating because “backup worked fine on grid” — it fails exactly when the grid fails.
  • Improvised N-E bonding in the backup panel to stop RCD trips. [KNB-VAL-04]
  • Using undersized or indoor-rated earth cable — 10 mm² outdoor single-core copper is the specified conductor.

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When to escalate

Escalate to Kent New Energy service only — through your registered Kent partner channel or the Kent service desk details on your work order. Do not contact any third-party or component-manufacturer support line for a Kent-branded system: tickets outside the Kent channel are not tracked, not covered, and can void warranty handling.