FoxESS Community - Owners & Installers Forum

Hi

I saw this video showing that it is now a modbus server on the newer inverters.
https://www.youtube.com/watch?v=q8A32xMifmA

I tried using my H3 Smart 15kW but get this error:

changed to Error reading registers. Type: RegisterType.HOLDING; start: 31000; count: 91; slave: 247 from tcp://IP_ADDRESS:502: Modbus Error: [Input/Output] Modbus Error: [Invalid Message] No response received, expected at least 8 bytes (0 received)

Master : 1.30 Slave : 1.00 Manager : 1.18

Has anyone had any luck? Firmware version or some thing needs to be enabled?

That’s my video. Does your inverter have an integrated data logger or a plug in module?

It's got the integrated datalogger (Type: WL-H3-G2).

I have similar (integrated datalogger (Type: WL-H3-G2) + Device: H3-9.9-Smart)

I can't find the ip on my lan / anyway to customise it.

I can connect to the wifi of the device (using the wifi W* and password mtmt2020 - but there is no configuration page?
"In the address bar, type 192.168.1.1.
This will open the dongle's configuration interface"

Stuck as would be cool to integrate this into Home assistant

Yeah getting same error - I redid the wifi network and snagged the ip:
Error connecting to inverter (friendly name: "FoxEss"). Error reading registers. Type: RegisterType.HOLDING; start: 31000; count: 91; slave: 247 from tcp://192.168.68.106:502: Modbus Error: [Input/Output] Modbus Error: [Invalid Message] No response received, expected at least 8 bytes (0 received)

I might have to raise something with the home assistant project, as using my phone and an app, it can read the registers! Just home assistant app can't.

Getting close

https://imgur.com/a/bqPdLNc

Got it working, seems a few others had similar issues!
https://github.com/nathanmarlor/foxess_ ... ssions/994
"Answered by williamjeccles
2 days ago
You don’t need a modbus device. Just use the inverters ip address and set the integration to direct lan using the latest beta version and it will work. Smart and WL inverters have a tcp modbus server built into them."

Use the beta version of the release and make sure your inverter updated to the latest version.

Awesome to get the modbus info directly in home assistant now.

Trentan wrote: ↑Tue Dec 23, 2025 1:25 pm Got it working, seems a few others had similar issues!
https://github.com/nathanmarlor/foxess_ ... ssions/994
"Answered by williamjeccles
2 days ago
You don’t need a modbus device. Just use the inverters ip address and set the integration to direct lan using the latest beta version and it will work. Smart and WL inverters have a tcp modbus server built into them."

Use the beta version of the release and make sure your inverter updated to the latest version.

Awesome to get the modbus info directly in home assistant now.

I am getting the "Modbus Error: [Input/Output] Modbus Error: [Invalid Message] No response received, expected at least 8 bytes (0 received)" error.

What version of firmware fixed the issue for the H3 Smart?

You have to select the most recent beta release / version (not the standard one).

Think a few others had similar issues and a beta release fixed it.