Questions
1. The correct restart discipline when a fault code appears on either platform is:- A. One restart; if the fault persists, stop and escalate to Kent service
- B. Restart repeatedly until the code clears or 30 minutes have passed
- C. Never restart — escalate immediately without any restart attempt
- D. Three restarts, ten minutes apart, then escalate
2. The correct power-off sequence before any service work is:
- A. Turn off the grid AC breaker first, then the battery
- B. Turn off the battery switch first, then the grid AC — the exact reverse of power-on
- C. Turn off the PV DC switch first, always
- D. Any order is acceptable once the display is dark
3. A Kent M1 showing E400–E402 or a Kent G3 showing “CAN Fail” with SOC missing — the first check is:
- A. Check the battery cells for physical damage
- B. Check the BMS communication cable — label, continuity, pinout, and RJ45 seating — before touching any setting
- C. Update the inverter firmware
- D. Check the grid code setting
4. Kent G3 “BatName-FAIL” means:
- A. The battery pack is empty — recharge before commissioning
- B. The BMS fuse has blown
- C. The battery selection in the HMI is wrong — correct it after the comm cable is confirmed good
- D. The inverter firmware needs updating
5. Kent M1 E303 (AFCI) fault behaviour is:
- A. Permanent lockout — a service call is always required to clear it
- B. Clears only after a full battery reset and 24-hour wait
- C. Auto-recovers; if it occurs 5 times in one day it auto-clears — check the AFCI CT connection if the code repeats
- D. A cosmetic fault that can be ignored
6. Grid protection points — voltage and frequency trip thresholds — should be changed:
- A. By the installer to match the nearest available grid code
- B. By the customer from the display if tripping seems too frequent
- C. Automatically by the meter when grid conditions change
- D. Only per the Kent-issued parameter sheet for the specific DISCOM — never improvised or estimated
7. A backup circuit that trips the backup output breaker under load is best resolved by:
- A. Widening the backup breaker’s trip setting
- B. Moving the overloaded load to the grid-only panel — backup overload means something too big is on the essential panel
- C. Increasing the inverter’s rated power via a setting
- D. Replacing the backup breaker with a higher-rated type
8. Kent M1 fault code E100 means:
- A. PV string overvoltage
- B. Battery undervoltage — check the pack SOC
- C. No AC connection — restore the AC path: upstream breaker, terminations, cable
- D. Fan failure
9. Kent M1 E303 (AFCI) occurs up to 5 times per day without intervention. Before diagnosing further, you should check:
- A. The PV string Voc against the 500 V limit
- B. The AFCI CT connection and installation at the PV input
- C. The battery SOC level
- D. The grid frequency setting
10. An internal fault code — Kent M1 E600–E602 or Kent G3 INI-FAULT / DSP-B-FAULT — that survives one restart is:
- A. A site wiring problem — check terminations before escalating
- B. Fixed by a factory reset from the advanced menu
- C. Fixed by swapping the BMS communication cable
- D. A Kent service case — stop all work, do not open the unit
Answer key
| Q | Answer | Why |
|---|---|---|
| 1 | A | One restart is the maximum field step. If the fault survives a single restart, the job is an escalation — not more cycling. Repeated restarts obscure fault data. |
| 2 | B | Power-off is the reverse of power-on: battery off first, then grid AC. This sequence protects the inverter from back-feeding and protects the battery from an uncontrolled disconnect. |
| 3 | B | A BMS comm fault is almost always a cable problem. Check the crossover cable label, continuity, pinout, and RJ45 seating before touching any setting or firmware. |
| 4 | C | BatName-FAIL means the battery selection in the HMI does not match the connected pack. Correct the selection to PYLON_LV (for Kent Lithium Battery) after confirming the comm cable is good. |
| 5 | C | E303 auto-recovers and clears itself after 5 occurrences in a day. If it repeats, investigate the AFCI CT connection at the PV input — it is not a hard fault requiring a service call by itself. |
| 6 | D | Grid protection points are utility-consent settings. Use only the Kent-issued parameter sheet for the site’s specific DISCOM. Improvised changes risk grid disconnection or regulatory violation. |
| 7 | B | Backup overload means something too large is on the essential panel. The fix is to move that load to grid-only — not to widen the trip point or upsize the breaker. |
| 8 | C | E100 is “No AC Connection.” Check the upstream AC breaker, the AC wiring terminations, and the cable path before looking elsewhere. |
| 9 | B | When E303 repeats, check the AFCI CT connection and installation at the PV input. A loose or incorrectly installed AFCI CT is the most common cause of repeat E303 events. |
| 10 | D | Internal fault codes that survive a restart are Kent service cases. Do not open the unit, do not attempt a factory reset — escalate with the fault code, time, and one restart record. |