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Earthing the Kent G3 comes before any PV, battery, or AC wiring. The external chassis terminal, the PE bar inside the wire box, and the single extra rule for paralleled systems are covered here.
For trained and authorized installers only. An unearthed inverter is a shock hazard. An SPD without a path to ground protects nothing.

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Before You Start

  • Measure and photograph the earth pit per Earthing & Protection. Escalate poor soil resistance before energizing anything.
  • Prepare the PE conductor for the AC side at 10 mm² (6 AWG) — the same figure used in the AC wiring table.
Earth resistance measurement and recording is a required pass criterion before energizing. [KNB-VAL-14]

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External Grounding Conductor

External ground terminals are provided on both sides of the inverter. Use the right-side terminal as standard.
1

Prepare the lug

Crimp an M5 OT ring terminal onto copper earth wire — solid or stranded, sized to local code and the AC PE figure.
2

Connect to the chassis terminal

Fit the ring terminal to the chassis ground terminal and torque to 3.3 N·m.
3

Verify and photograph

Confirm the lug is flat against the terminal face, no rotation under hand pressure. Photograph for the checklist. 📷

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System Ground Through the Wire Box

Run the grounding conductor from the main service panel’s ground bar to the ground bar inside the inverter wire box, alongside the AC PE terminations. Both paths — chassis terminal and wire-box PE bar — must be continuous to the same earth electrode.

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Parallel Systems

All paralleled inverters must connect to the same ground point. Running each unit to a separate earth pit creates a voltage potential between inverter grounds. That potential damages communications and defeats surge protection.
Pending Kent validation — do not configure in the field. [KNB-VAL-04]Backup N-E bond-relay behaviour and the approved RCD scheme for both platforms are under written confirmation. Until the confirmed guidance is published here: follow the Kent N-E test in the commissioning checklist and never improvise an external N-E bond.

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Common Mistakes

  • Grounding “through the mounting bracket” — the M5 terminal with a crimped lug is the required path.
  • Two paralleled inverters connected to two separate earth pits.
  • SPDs fitted with long, looping earth leads that add impedance and defeat clamping.
  • PE conductor undersized because it was sized to the inverter output instead of the AC input.