COM ports
Keep unused gland holes plugged with their watertight caps; the COM2/3 fastening rings open
at the side — squeeze cables in through the side openings.
Communication terminals
Kent G3 communication terminals — figure KNB-G3-CR-08
The BMS pinout and the Kent battery crossover rule are covered on
Battery Wiring.
Parallel systems — the rules
Kent G3 parallel connection figures — figure KNB-G3-CR-09
- Up to 6 identical units. Different models never parallel (a 12 kW and a 15 kW cannot pair).
- Chain P-A / P-B with shielded CAT5, ≤ 5 m between adjacent units.
- DIP switch (2-way, “1 2 ON”): both pins ON at the first and the last inverter in the chain; OFF on the middle units.
- One shared battery bank; its BMS connects to the master inverter.
- Addresses set on the HMI: master = 1 (mandatory), slaves 2, 3, … — never 0.
- Every unit gets its own datalogger stick, or remote upgrade of the fleet is impossible.
- All paralleled units share one ground point — see Earthing.
DRM port (optional)
RJ45 pins 5 & 6: shorted = inverter generates; open = shutdown within 5 s. A hidden cause of “inverter won’t start” on sites where someone wired it and forgot.Datalogger
The USB COM port accepts the approved datalogger stick only — other use is forbidden; keep the dust cover on when unused. Fit the stick physically; it is activated with Kent Central Command — documentation to follow.Common mistakes
- DIP pins left OFF at the chain ends (or ON in the middle) — intermittent parallel faults.
- 12 kW + 15 kW “temporarily” paralleled — unsupported, full stop.
- One datalogger “for the site” on a 4-unit array.
- Something other than the datalogger plugged into the USB COM port.