Unable to connect to inverter (SDongle), FW V200R022C10SPC110 #1195

marcogaio · 2025-12-01T17:04:47Z

marcogaio
Dec 1, 2025

I've a just installer new plant, composed by:

inverter batteria: SUN2000-3K-LB0, SW V300R024C00SPC101
inverter incentivo: SUN2000-3K-LB0, SW V300R024C00SPC101
SDongle: SDongleA-05, SW V200R022C10SPC110

The SDongle got a static IP address and TCP Modbus seems enabled:

gaio@leia:~$ sudo nmap -p1-10000 igaio1
Starting Nmap 7.94SVN ( https://nmap.org ) at 2025-12-01 15:22 CET
Nmap scan report for igaio1 (192.168.5.14)
Host is up (0.021s latency).
rDNS record for 192.168.5.14: sdonglea-1.lilliput.linux.it
Not shown: 9998 closed tcp ports (reset)
PORT     STATE SERVICE
502/tcp  open  mbap
6606/tcp open  unknown
MAC Address: B0:C7:87:D0:3B:99 (Huawei Technologies)

Nmap done: 1 IP address (1 host up) scanned in 23.84 seconds

I've installed the HA module, enabled it and i've tried to configure it; after some fiddling i've enabled the debug and found that port 6606 seems not to work (there's nothink more then a connection refused); but port 502 seems at least to reply:

 Dec  1 17:24:52 vhalpb1 homeassistant: 2025-12-01 17:24:52.258 DEBUG (MainThread) [pymodbus.logging] Connecting to 192.168.5.14:502.
 Dec  1 17:24:54 vhalpb1 homeassistant: 2025-12-01 17:24:53.663 DEBUG (MainThread) [pymodbus.logging] recv: 0x0 0x1 0x0 0x0 0x0 0x21 0x1 0x3 0x1e 0x53 0x55 0x4e 0x32 0x30 0x30 0x30 0x2d 0x33 0x4b 0x2d 0x4c 0x42 0x30 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 extra data: 
 Dec  1 17:24:54 vhalpb1 homeassistant: 2025-12-01 17:24:53.664 DEBUG (MainThread) [pymodbus.logging] Processing: 0x0 0x1 0x0 0x0 0x0 0x21 0x1 0x3 0x1e 0x53 0x55 0x4e 0x32 0x30 0x30 0x30 0x2d 0x33 0x4b 0x2d 0x4c 0x42 0x30 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0
 Dec  1 17:24:54 vhalpb1 homeassistant: 2025-12-01 17:24:53.664 DEBUG (MainThread) [pymodbus.logging] decoded PDU function_code(3 sub -1) -> ReadHoldingRegistersResponse(dev_id=0, transaction_id=0, address=0, count=0, bits=[], registers=[21333, 20018, 12336, 12333, 13131, 11596, 16944, 0, 0, 0, 0, 0, 0, 0, 0], status=1, retries=0) 
 Dec  1 17:24:54 vhalpb1 homeassistant: 2025-12-01 17:24:53.664 WARNING (MainThread) [pymodbus.logging] ERROR: received pdu without a corresponding request, IGNORING

 Dec  1 17:25:04 vhalpb1 homeassistant: 2025-12-01 17:25:04.899 DEBUG (MainThread) [pymodbus.logging] recv: 0x0 0x1 0x0 0x0 0x0 0x21 0x1 0x3 0x1e 0x53 0x55 0x4e 0x32 0x30 0x30 0x30 0x2d 0x33 0x4b 0x2d 0x4c 0x42 0x30 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 extra data: 
 Dec  1 17:25:04 vhalpb1 homeassistant: 2025-12-01 17:25:04.899 DEBUG (MainThread) [pymodbus.logging] Processing: 0x0 0x1 0x0 0x0 0x0 0x21 0x1 0x3 0x1e 0x53 0x55 0x4e 0x32 0x30 0x30 0x30 0x2d 0x33 0x4b 0x2d 0x4c 0x42 0x30 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0
 Dec  1 17:25:04 vhalpb1 homeassistant: 2025-12-01 17:25:04.899 DEBUG (MainThread) [pymodbus.logging] decoded PDU function_code(3 sub -1) -> ReadHoldingRegistersResponse(dev_id=0, transaction_id=0, address=0, count=0, bits=[], registers=[21333, 20018, 12336, 12333, 13131, 11596, 16944, 0, 0, 0, 0, 0, 0, 0, 0], status=1, retries=0) 
 Dec  1 17:25:04 vhalpb1 homeassistant: 2025-12-01 17:25:04.901 DEBUG (MainThread) [huawei_solar.huawei_solar] Sleeping for 0.048982 seconds before making next call
 Dec  1 17:25:05 vhalpb1 homeassistant: 2025-12-01 17:25:04.952 DEBUG (MainThread) [huawei_solar.huawei_solar] Reading register 30015 with length 50 from server 1
 Dec  1 17:25:05 vhalpb1 homeassistant: 2025-12-01 17:25:04.953 DEBUG (MainThread) [pymodbus.logging] send: 0x0 0x1 0x0 0x0 0x0 0x6 0x1 0x3 0x75 0x3f 0x0 0x32

 Dec  1 17:25:06 vhalpb1 homeassistant: 2025-12-01 17:25:06.604 DEBUG (MainThread) [pymodbus.logging] recv: 0x0 0x1 0x0 0x0 0x0 0x67 0x1 0x3 0x64 0x54 0x41 0x32 0x35 0x31 0x30 0x31 0x35 0x31 0x31 0x31 0x35 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x30 0x31 0x30 0x37 0x37 0x31 0x36 0x30 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x56 0x33 0x30 0x30 0x52 0x30 0x32 0x34 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x56 0x33 0x30 0x30 0x52 0x30 0x32 0x34 0x43 0x30 0x30 0x53 0x50 0x43 0x31 0x30 0x31 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 extra data: 
 Dec  1 17:25:06 vhalpb1 homeassistant: 2025-12-01 17:25:06.604 DEBUG (MainThread) [pymodbus.logging] Processing: 0x0 0x1 0x0 0x0 0x0 0x67 0x1 0x3 0x64 0x54 0x41 0x32 0x35 0x31 0x30 0x31 0x35 0x31 0x31 0x31 0x35 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x30 0x31 0x30 0x37 0x37 0x31 0x36 0x30 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x56 0x33 0x30 0x30 0x52 0x30 0x32 0x34 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x56 0x33 0x30 0x30 0x52 0x30 0x32 0x34 0x43 0x30 0x30 0x53 0x50 0x43 0x31 0x30 0x31 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0
 Dec  1 17:25:06 vhalpb1 homeassistant: 2025-12-01 17:25:06.605 DEBUG (MainThread) [pymodbus.logging] decoded PDU function_code(3 sub -1) -> ReadHoldingRegistersResponse(dev_id=0, transaction_id=0, address=0, count=0, bits=[], registers=[21569, 12853, 12592, 12597, 12593, 12597, 0, 0, 0, 0, 12337, 12343, 14129, 13872, 0, 0, 0, 0, 0, 0, 22067, 12336, 21040, 12852, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 22067, 12336, 21040, 12852, 17200, 12371, 20547, 12592, 12544, 0, 0, 0, 0, 0, 0], status=1, retries=0) 
 Dec  1 17:25:06 vhalpb1 homeassistant: 2025-12-01 17:25:06.605 WARNING (MainThread) [pymodbus.logging] ERROR: received pdu without a corresponding request, IGNORING

After these three tries, there's a python exception on:

Dec  1 17:25:45 vhalpb1 homeassistant: 2025-12-01 17:25:44.961 ERROR (MainThread) [custom_components.huawei_solar.config_flow] Unexpected exception while connecting via ModbusTCP

and HA display an error.

Someone can help me? Thanks.

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Unable to connect to inverter (SDongle), FW V200R022C10SPC110 #1195

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Unable to connect to inverter (SDongle), FW V200R022C10SPC110 #1195

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marcogaio Dec 1, 2025

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marcogaio
Dec 1, 2025