All three phase power registers return zero. What is wrong?

The inverter may not yet be connected to the grid, or Modbus TCP has not been enabled. Confirm the inverter is energized and grid-connected, then re-check the communication settings. Also verify the unit ID in the portal matches the slave address configured on the device.

Phase current values look scaled incorrectly. How do I fix this?

The currents_a, currents_b, and currents_c registers are signed 32-bit integers occupying two consecutive 16-bit holding registers each. Confirm your polling tool or the Gateway firmware reads both words as a single int32. A missing high-word read will produce values that are off by a factor of 65536.

The Gateway connects but the energy register never updates. Why?

The energy register at address 4870 is a uint32 accumulator that only increases over time. If the value appears frozen, confirm the inverter has been running and exchanging energy with the grid. A reading of zero after a fresh firmware flash is normal until the inverter logs measurable energy.

The portal shows timeout errors even though the inverter IP is reachable. What now?

Senergy inverters may limit the number of simultaneous Modbus TCP connections. If another monitoring tool, such as the manufacturer app or a logger dongle, is already holding an open TCP session, the Gateway connection will be refused. Disconnect competing clients and retry the Gateway poll.

Free Modbus template: Senergy Hybrid Inverter (grid)

The Senergy Hybrid Inverter is a hybrid PV and battery storage inverter used in residential and commercial self-consumption installations. The Alfred 10 variant combines a 10 kW inverter with a modular battery system. This template connects via Modbus TCP and reads the grid-side register block, covering per-phase active power on phases A, B, and C, cumulative grid energy, and per-phase grid currents. Together these values give you a complete three-phase picture of grid exchange, enabling accurate monitoring of import, export, and load balance from the ModbusCloud portal.

Name	Address	Function	Type	Unit	Access
power_a Active power on grid phase A, signed, watts.	4864	FC03	int32	W	R
power_b Active power on grid phase B, signed, watts.	4866	FC03	int32	W	R
power_c Active power on grid phase C, signed, watts.	4868	FC03	int32	W	R
energy Cumulative grid energy, unsigned 32-bit counter.	4870	FC03	uint32		R
currents_a Grid current on phase A, signed integer.	4893	FC03	int32	A	R
currents_b Grid current on phase B, signed integer.	4895	FC03	int32	A	R
currents_c Grid current on phase C, signed integer.	4897	FC03	int32	A	R

Senergy Hybrid Inverter (grid)

Overview

Use cases

Installation

Things to watch for

Registers (7)

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