Why does the power register return zero or nonsense values?

The iHomeManager transfers 32-bit registers in little-endian word order. Ensure your Modbus client applies a word-swap when reading the int32 value at address 8154. Without the swap, the two 16-bit words are combined in the wrong order, producing incorrect or zero readings.

The gateway connects but no values appear after import. What now?

The iHM accepts only one Modbus TCP connection at a time on port 502. Disconnect any other Modbus clients such as Home Assistant or third-party monitoring tools before polling from the ModbusCloud Gateway. Also confirm the unit ID is set to 247, not the default of 1.

PV power reads correctly on the inverter but not on the iHM. Why?

When an iHomeManager is added to a Sungrow system, the inverter stops exposing generation and grid data on its own Modbus interface. The iHM takes over measurement at the grid connection point. You must poll the iHM directly at its own IP address for PV power data.

The iHM's IP address changes and breaks the connection. How do I prevent this?

Assign a static IP address to the iHomeManager in your router's DHCP settings using the device's MAC address. Alternatively, if your router supports hostname-based routing, use the iHM's hostname. Update the IP in the ModbusCloud portal device configuration after any change.

Free Modbus template: Sungrow iHomeManager (iHM) (pv)

Name: Sungrow iHomeManager (iHM) (pv)
Brand: Sungrow
SKU: 5ea06c1f-a7fc-4351-82ad-5284f7f007ee

The Sungrow iHomeManager (iHM) is a residential home energy management system that coordinates PV generation, battery storage, EV charging, and load control within a Sungrow installation. This template reads the iHM's PV power register via Modbus TCP, giving the ModbusCloud Gateway a direct source for live solar yield data. When the iHM is installed, the connected inverter no longer exposes grid and generation data on its own Modbus interface, making direct iHM polling essential. Tracking PV power through this template keeps your portal's energy dashboards accurate without relying on the iSolarCloud API.