Questions
1. In a closed-loop BMS setup, the inverter display shows:- A. A fixed default SOC of 50 % until fully charged
- B. Live SOC from the BMS and the battery model name
- C. Only voltage — closed-loop does not transmit SOC
- D. SOC rounded to the nearest 10 %
2. The communication protocol that carries BMS data between the Kent Lithium Battery and the inverter is:
- A. RS485 (Modbus)
- B. RS232
- C. CAN
- D. Ethernet
3. On the RJ45 BMS port of the Kent inverter, CAN-H is on pin ___ and CAN-L is on pin ___:
- A. Pin 1 and pin 2
- B. Pin 3 and pin 6
- C. Pin 4 (CAN-H) and pin 5 (CAN-L)
- D. Pin 7 and pin 8
4. The Kent Lithium Battery uses a mirrored RJ45 pinout. The correct communication cable between the pack and the inverter is therefore:
- A. A straight-through RJ45 patch cable — same as a network cable
- B. Any CAT5 cable under 3 m
- C. A crossover cable — CAN pins 4 and 5 are reversed between pack and inverter
- D. A USB-A to RJ45 adapter
5. The recommended SOC range for storing a Kent Lithium Battery pack when the system will be idle for an extended period is:
- A. 0–10 % — empty is the safest storage state
- B. 30–60 % SOC
- C. Always charge to 100 % before storage
- D. Any SOC below 80 % is acceptable
6. When the BMS communication link is lost, the inverter displays a frozen SOC value. This indicates:
- A. A battery calibration problem — the BMS has lost its cell data
- B. A communication problem — check the cable, pinout, and seating before touching any settings
- C. The battery is at end of life
- D. Normal behaviour when PV is not producing
7. The Kent G3 Battery Healing switch is used to:
- A. Charge the battery to 100 % from the grid without allowing discharge, restoring SOC accuracy
- B. Balance cells by forcing a full discharge to empty
- C. Replace faulty BMS firmware over the CAN link
- D. Run an automatic monthly capacity test
8. A dormant Kent Lithium Battery pack that has gone into deep-discharge protection should be woken using:
- A. A bench power supply connected briefly to the pack terminals to inject a small charge
- B. The official inverter function only — Kent G3 Battery Wakeup switch / Kent M1 Activate Bat
- C. Shorting the battery terminals briefly to trigger the BMS reset
- D. Holding the pack power button for 30 seconds
9. The Kent F1-5120 battery pack maximum continuous discharge current is:
- A. 100 A
- B. 120 A
- C. 60 A
- D. 40 A
10. In a multi-pack Kent Lithium Battery stack, the CAN communication cable runs from:
- A. Every pack to the inverter, in a star topology
- B. The master pack to the inverter — the master handles communication for the whole stack
- C. The last pack in the string to the inverter
- D. Pack to pack only — the inverter reads SOC via voltage
Answer key
| Q | Answer | Why |
|---|---|---|
| 1 | B | Closed-loop BMS means live SOC and battery model name are shown on the inverter display. If the model name is missing or SOC is frozen, communication is broken. |
| 2 | C | CAN is the lithium battery communication link on both Kent platforms. RS485 is used for meters and some older packs — not for the Kent Lithium Battery BMS. |
| 3 | C | The inverter BMS RJ45 port has CAN-H on pin 4 and CAN-L on pin 5. The Kent battery pack mirrors this, which is why a crossover cable is needed. |
| 4 | C | The Kent Lithium Battery pinout mirrors the inverter — CAN-H and CAN-L are on the same pin numbers at both ends. A crossover cable swaps them correctly. Use only the labelled Kent comm cable. |
| 5 | B | Storage SOC is 30–60 %. Storing empty causes deep discharge; storing at 100 % accelerates calendar degradation. |
| 6 | B | A frozen SOC is a communication symptom, not a calibration problem. Check the cable label, continuity, RJ45 seating, and pinout before changing any setting. |
| 7 | A | Battery Healing on the Kent G3 charges the pack to 100 % from the grid without allowing any discharge, which re-anchors the BMS SOC calculation. |
| 8 | B | Use only the inverter’s official wakeup function. Jump-charging from a bench supply or shorting terminals can damage the BMS or the pack and voids the warranty. |
| 9 | C | The F1-5120 maximum continuous discharge current is 60 A. System design must not demand more than this from a single pack. |
| 10 | B | One CAN cable runs from the master pack to the inverter. The master manages communication for the whole stack — the inverter does not need individual connections to each pack. |