[Bug]: Solax X3-HAC 11kW - Sensor: "Charge Added - Cumulative" wrong values

[RoterRaecher]

Describe the bug

The sensor Charge Added - Cumulative (sensor.solax_wallbox_charge_added_cumulative)
is displaying a value that is much too high.

Integration Version

2026.07.2

Homeassistant core version

2026.7.4

Inverter brand

X3-HAC 11kW

Plugin used

plugin_solax_ev_charger.py

Serial prefix

5030B0

Inverter firmware versions

ARM: 1.56-1.15 MDSP: 1.58

Connection Method

Solax WiFi+LAN

Dongle firmware

1.009.02

Detailed Error Log

No response

Additional context

No response

[rosenrot00]

Could you run the following commands on a machine that has access to the wallbox? Please replace the <WALLBOX-IP> with the correct IP and report back what it responds.

mbpoll -m tcp -a 1 -p 502 -1 -0 -t 3:hex -r 16 -c 2 <WALLBOX-IP>
mbpoll -m tcp -a 1 -p 502 -1 -0 -B -t 3:int -r 16 -c 1 <WALLBOX-IP>
mbpoll -m tcp -a 1 -p 502 -1 -0    -t 3:int -r 16 -c 1 <WALLBOX-IP>

[RoterRaecher]

Hello,

here are the responds:

Protocol configuration: ModBus TCP
Slave configuration...: address = [1]
                        start reference = 16, count = 2
Communication.........: 10.2.4.8, port 502, t/o 1.00 s, poll rate 1000 ms
Data type.............: 16-bit register, input register table

-- Polling slave 1...
[16]:   0x090B
[17]:   0x1387

Protocol configuration: ModBus TCP
Slave configuration...: address = [1]
                        start reference = 16, count = 1
Communication.........: 10.2.4.8, port 502, t/o 1.00 s, poll rate 1000 ms
Data type.............: 32-bit integer (big endian), input register table

-- Polling slave 1...
[16]:   151720839

Protocol configuration: ModBus TCP
Slave configuration...: address = [1]
                        start reference = 16, count = 1
Communication.........: 10.2.4.8, port 502, t/o 1.00 s, poll rate 1000 ms
Data type.............: 32-bit integer (little endian), input register table

-- Polling slave 1...
[16]:   327616779

[rosenrot00]

Thanks. These results confirm the issue. Neither word order produces a plausible cumulative energy value, so this is not just an endian problem.
Could you also provide the current cumulative energy shown in the SolaX app and run:

mbpoll -m tcp -a 1 -p 502 -1 -0 -t 3:hex -r 15 -c 3 <WALLBOX-IP>
mbpoll -m tcp -a 1 -p 502 -1 -0 -t 4:hex -r 1561 -c 2 <WALLBOX-IP>
mbpoll -m tcp -a 1 -p 502 -1 -0 -B -t 4:int -r 1561 -c 1 <WALLBOX-IP>
mbpoll -m tcp -a 1 -p 502 -1 -0    -t 4:int -r 1561 -c 1 <WALLBOX-IP>

Please also tell us whether the wallbox was actively charging while the commands were run.

[RoterRaecher]

Hello,

thanks for your support. Here are the other responds.
The car was not charging at this time:

mbpoll -m tcp -a 1 -p 502 -1 -0 -t 3:hex -r 15 -c 3

Protocol configuration: ModBus TCP
Slave configuration...: address = [1]
                        start reference = 15, count = 3
Communication.........: 10.2.4.8, port 502, t/o 1.00 s, poll rate 1000 ms
Data type.............: 16-bit register, input register table

-- Polling slave 1...
[15]:   0x0001
[16]:   0x090B
[17]:   0x1387

mbpoll -m tcp -a 1 -p 502 -1 -0 -t 4:hex -r 1561 -c 2

Protocol configuration: ModBus TCP
Slave configuration...: address = [1]
                        start reference = 1561, count = 2
Communication.........: 10.2.4.8, port 502, t/o 1.00 s, poll rate 1000 ms
Data type.............: 16-bit register, output (holding) register table

-- Polling slave 1...
Read output (holding) register failed: Illegal data value

mbpoll -m tcp -a 1 -p 502 -1 -0 -B -t 4:int -r 1561 -c 1

Protocol configuration: ModBus TCP
Slave configuration...: address = [1]
                        start reference = 1561, count = 1
Communication.........: 10.2.4.8, port 502, t/o 1.00 s, poll rate 1000 ms
Data type.............: 32-bit integer (big endian), output (holding) register table

-- Polling slave 1...
Read output (holding) register failed: Illegal data value

mbpoll -m tcp -a 1 -p 502 -1 -0 -t 4:int -r 1561 -c 1

Protocol configuration: ModBus TCP
Slave configuration...: address = [1]
                        start reference = 1561, count = 1
Communication.........: 10.2.4.8, port 502, t/o 1.00 s, poll rate 1000 ms
Data type.............: 32-bit integer (little endian), output (holding) register table

-- Polling slave 1...
Read output (holding) register failed: Illegal data value

[TCWORLD]

This seems to be similar to #2230. Looking at the value 1769472, if the 16bit word order is swapped, that becomes 27 which seems to be a more sensible value.
Do you know what that value should actually be (e.g. from SolaX cloud)?

[RoterRaecher]

Hello,

it is the total meter for the consumed kW/h from the wallbox.

[TCWORLD]

Sorry, I meant do you know the actual real numerical value so we can check if it's an endian issue

[RoterRaecher]

Sorry... my misstake... Here are the current values:

• HomeAssistant:

• Solax Cloud:

[TCWORLD]

Yeah, so it's definitely a word order issue. 3552051.2/65536 = 54.2.

[TCWORLD]

Could you try applying the patch in #2234 (e.g. using the file editor app) then restart HA. Hopefully it starts reporting the correct value.