Configuration H3-10.0-Smart Fox Ess Home assistent

Configuration
1

Hi all,

My name is Remco. I have some basic experience with networking (NAS setup, port forwarding, etc.), but I’m still fairly new to Home Assistant.

I recently started using HA with a Home Green Smart Hub and I’m really impressed so far. I’m currently trying to integrate my FoxESS system to get more detailed insights and control.

I’ve installed HACS and added the FoxESS – Modbus integration (v1.13.6). The integration looks great, but I’m unable to get it working with my setup.

My system:

  • FoxESS H3-10.0-Smart inverter

What I’ve tried:

  • Verified internal IP address and port (502)
  • Confirmed TCP is open
  • Tried both S and F protocols
  • Tested different inverter/slave IDs
  • Tried various combinations in Network, Version, and Advanced settings
  • Followed the Iam Eccles video guide

What happens:

  • The integration loads
  • I can see sensors and the inverter name
  • But all values remain unavailable / no data is received

Error message:

Error connecting to inverter (friendly name: “Fox Ess”)
Error reading registers:
Type: RegisterType.HOLDING; start: 31000; count: 91; slave: 1
tcp://192.168.2.3:502
Modbus Error: [Input/Output] Modbus Error: [Invalid Message]
No response received, expected at least 8 bytes (0 received)

It seems like HA is not receiving any Modbus data, even though the connection settings appear correct.

I couldn’t find anyone with the same inverter model in the forum, so I’m hoping someone here has experience with the H3-10.0-Smart or can point me in the right direction.

Thanks in advance!

2

You may find the Protocol Wizard useful for diagnostics and troubleshooting.

Check your 120ohm MODBUS termination resisters are connected.

1 Like
3

Thanks, I’ll give it a try! I find it surprising that not more people have the same problem.

1 Like
4

I too have this problem with my H3-15
No success so far.

5

Hi Rabit,

I’m curious how I can check whether I actually have the correct inverter version that supports Modbus TCP. It seems that only the later models support this — the ones with the small antenna at the bottom and the correct firmware.

The only information I can currently see is in my Fox dashboard, where the details of my inverter are shown.
H3-10.0-Smart

Supported models are:

Fox Ess
Fox Ess334×331 21 KB

6

So this isn’t working. I thought you meant something else, but I installed this and still have no connection.