Phase Sequence
Terminal labels on all three ports read W(L3) · V(L2) · U(L1) · N · PE. Match each terminal to the utility’s actual phases, then verify rotation with a phase rotation meter before energizing. Wrong rotation blocks grid sync and raises phase alarms.Cables and Torque
| Port | Cross-section | Torque |
|---|---|---|
| AC Grid | 6–10 mm² (8–6 AWG) | 4–5 N·m |
| AC Backup | 4–10 mm² (10–6 AWG) | 4–5 N·m |
| AC GEN | 4–10 mm² (10–6 AWG) | 4–5 N·m |
| PE (all ports) | 10 mm² (6 AWG) | 4–5 N·m |
- Strip 13 mm, crimp R-type connectors, and torque with a torque wrench — not by feel.
- Terminal maximum temperature is 85 °C. Heat at a terminal means a workmanship issue, not an overloaded circuit.
- The backup loads panel must not be electrically connected to the main service panel.
Size for Pass-Through Plus Charging, Not Output
The grid side carries both battery charging current and up to 50 A continuous AC pass-through to backup loads simultaneously. Grid-side max input current is:| Model | Max input current per phase | Max grid-side input power |
|---|---|---|
| Kent G3 10KW | 22.8 A | 15 kW |
| Kent G3 12KW | 27.3 A | 18 kW |
| Kent G3 15KW | 34.2 A | 22.5 kW |
Backup Behaviour to Know While Wiring
- Transfer to backup: < 10 ms
- Overload capacity: 2× rated power for 10 seconds
- Maximum phase imbalance: 50%
Common Mistakes
- U and W swapped because the wire colours seemed to match — use a rotation meter, always.
- Grid OCPD sized to the output kW on a 15 kW unit that draws 34.2 A per phase while charging.
- Backup subpanel bridged to the main panel during testing and the bridge never removed.
- Terminals torqued by feel — 4–5 N·m requires a torque wrench.