Check first
- When exactly does it trip? Outage-linked → investigate neutral–earth voltage shift in backup. Dewy mornings → investigate PV insulation. Under one specific appliance → investigate that appliance. Random → measure, don’t guess.
- Which device trips — the main RCD, a sub-circuit RCD, or an MCB? An MCB trip is overcurrent, not leakage — this is a different flow. For MCB trips, follow Backup Not Working.
- Record the N–E voltage in both grid-connected and backup states before any other action. Kent service will ask for this reading.
Causes
| Cause | How to confirm | Fix |
|---|---|---|
| Neutral–earth voltage shift during backup | RCD trips only when grid drops or returns; N–E voltage changes between grid and backup states | Bonding scheme confirmation is pending — record N–E readings in both states, wire the backup PE exactly per the platform AC page, and escalate the pattern with those readings attached |
| PV insulation low in damp conditions | Faults cluster on dew or rain mornings; Kent M1: E304 (leakage current) / E305 (rainy-day ISO) · Kent G3: ILeak-PRO / PV ISO-PRO | Insulation-test the strings; locate the wet connector or chafed cable; E305’s own on-screen guidance covers the drying-out process |
| RCD type or rating mismatch | Trips with no measurable leakage current; device nameplate doesn’t match Kent guidance | Approved RCD types and ratings per Kent SKU are under confirmation — do not swap protection devices ad hoc; escalate with the device nameplate photographed |
| Genuine leakage on a load circuit | Isolating individual circuits by sectionalising identifies the tripping circuit | Fix the appliance or the circuit wiring — this is not an inverter matter |
| Overcurrent, not leakage | The tripping device is an MCB, not an RCD; clamp confirms excess current | Load sizing and backup rating — follow Backup Not Working |
Escalate when
- Outage-linked tripping persists on a site wired exactly per the platform AC pages — send N–E readings, the RCD nameplate photo, and a trip log to Kent.
- Leakage-class faults persist after the strings insulation-test clean and all connectors are verified dry and undamaged.
- Anyone proposes removing or bypassing the RCD “for now” — this is a stop-work condition, not a negotiation.
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.