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[walker-bho]

Hi all,
I have a SE8K-RWB48BFN4 with a three-phase Backup Interface (BIEU3P) and a SolarEdge Home Battery 48V (3 modules, 14.55 kWh). The hardware commissioning appears correct — BIEU3P is physically installed, RS485 wiring is in place, battery is charging/discharging normally.
However, during blackout tests the system does not hold island mode: loads power up for ~1 second, then the inverter shuts down, retries every 10-15 seconds in a loop.
Reading the inverter via Modbus TCP (port 1502) I found that register 63250 (proprietary SolarEdge, community-identified as "Backup Enable") reads 0 on my system.
My question: on your SE8K-RWB48 or SE10K-RWB48 with a working Backup Interface, what value does register 63250 return?

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from pymodbus.client import ModbusTcpClient
client = ModbusTcpClient('YOUR_INVERTER_IP', port=1502, timeout=5)
client.connect()
r = client.read_holding_registers(address=63250, count=1, device_id=1)
print(f"Register 63250: {r.registers[0]}")
client.close()

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I expect the value should be 1 on a correctly commissioned system, but I would appreciate confirmation from someone whose backup is actually working.
Thanks in advance.