The gateway connects but all register values show zero or null.

Modbus TCP is only accessible over the wired LAN port on the Storion SMILE. If the inverter is connected via Wi-Fi only, port 502 will not respond. Plug in an Ethernet cable and ensure the ModbusCloud Gateway is on the same network segment as the inverter.

Connection is refused at port 502 even over LAN.

Modbus slave mode may not be active. Access the inverter's settings panel under the communication or Modbus section and enable the Modbus interface. Some firmware versions require a service password (default 1111) to reach this menu. Confirm port 502 is open after enabling the setting.

The energy register value seems too large or has an unexpected decimal.

The energy register (address 18) is a raw uint32 with a scaling factor of 0.01, meaning the raw integer must be multiplied by 0.01 to obtain kilowatt-hours. If your integration does not apply this multiplier, the displayed value will be 100 times too large. Verify your template's scaling configuration matches the documented factor.

Phase current readings look implausible or inconsistent across L1, L2, L3.

Current registers (addresses 23, 24, 25) are signed int16 values with a resolution of 0.1 A per bit. Verify the template data type is set to int16 and that your display applies the 0.1 scaling factor. Also confirm no other Modbus client is polling the inverter simultaneously, as the Storion SMILE supports only one active Modbus TCP connection at a time.

Free Modbus template: Alpha ESS Storion SMILE (grid)

The Alpha ESS Storion SMILE is a hybrid PV inverter and battery storage system for residential and small-commercial installations. This template targets the integrated grid meter within the Storion SMILE and communicates over Modbus TCP using slave ID 85. It reads total active grid power, cumulative grid energy consumption, and per-phase currents across all three AC phases (L1, L2, L3). With this data in your ModbusCloud portal you can track import and export balance, detect phase imbalances, and validate energy billing against the utility meter.

Name	Address	Function	Type	Unit	Access
power Total active power at the grid connection point, signed watts.	33	FC03	int32	W	R
energy Cumulative total energy consumed from the grid, in watt-hours.	18	FC03	uint32	Wh	R
currents_a Grid meter phase A (L1) current, signed, in tenths of an ampere.	23	FC03	int16	A	R
currents_b Grid meter phase B (L2) current, signed, in tenths of an ampere.	24	FC03	int16	A	R
currents_c Grid meter phase C (L3) current, signed, in tenths of an ampere.	25	FC03	int16	A	R