Modbus TCP is enabled but the portal shows no data. Why?

Confirm the inverter's IP address is reachable from the ModbusCloud Gateway on port 502. The inverter must be on the same LAN segment. If a firewall or VLAN separates them, port 502 TCP must be explicitly allowed. Also verify the slave address in the portal matches the one set in the mySigen app.

The power register returns zero even when panels are producing. What is wrong?

Check that the Modbus TCP Server Enable switch is saved and still active in the mySigen app, as it can revert after a firmware update. Also confirm you are polling slave address 247 for plant-level data or the individual inverter's slave address for device-level data, as mixing these returns zeros or errors.

Why does register 30035 return a large negative number at night?

The power register is a signed int32. A negative value at night is normal if the inverter reports a small standby draw or measurement offset. Treat values near zero as idle, and apply a threshold in your alert rule rather than treating any negative reading as a fault.

Modbus stops responding after a few hours. What should I check?

Sigenergy inverters can drop the Modbus TCP connection if the polling interval is too aggressive or if the connection is not cleanly closed between requests. Set the ModbusCloud Gateway poll interval to at least 10 seconds and ensure the TCP session is closed after each transaction to avoid exhausting the inverter's connection slots.

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Free Modbus template: Sigenergy Sigen Hybrid (pv) | ModbusCloud

///Sigenergy Sigen Hybrid (pv)

Modbus TCP

Sigenergy Sigen Hybrid (pv)

Name: Sigenergy Sigen Hybrid (pv)
Brand: Sigenergy
SKU: c2aa0047-d9a2-4e69-8398-a811da4d368a

Sigenergy

Overview

The Sigenergy Sigen Hybrid is a residential and commercial hybrid solar inverter that combines PV generation and battery storage management in a single unit. This template connects to the Sigen Hybrid, Sigen PV Max, and SigenStore EC over Modbus TCP and reads the inverter active power register, giving your portal a live view of generation output. Use it to track production trends, build export reports, and feed energy-balance dashboards without additional hardware.

Use cases

Monitor live PV generation power from the Sigen Hybrid to verify system output against forecast irradiance.
Track daily and seasonal power output trends on the Sigen PV Max to detect performance degradation early.
Alert on unexpected drops in active power from the SigenStore EC to identify shading or inverter faults.
Compare power readings across multiple Sigenergy sites in a single ModbusCloud multi-site overview.

Report generation data from the Sigen Hybrid for feed-in tariff reconciliation or energy audit submissions.

Installation

1Enable Modbus TCP on the inverter: open the mySigen app, go to the Device panel, enter the inverter settings, turn on the Modbus TCP Server Enable switch, and save.
2Connect the Sigenergy inverter to the same LAN as the ModbusCloud Gateway using a standard Ethernet cable into the inverter's Fast Ethernet port; the device listens on TCP port 502.
3In the ModbusCloud portal, add your Gateway, import the Sigenergy Sigen Hybrid (pv) template, and assign the correct Modbus slave address (1 to 246) that matches the address configured in the mySigen app.
4Verify the connection by checking the live value of the power register in the portal; a non-zero reading during daylight hours confirms successful polling.

Things to watch for

Modbus TCP is enabled but the portal shows no data. Why?: Confirm the inverter's IP address is reachable from the ModbusCloud Gateway on port 502. The inverter must be on the same LAN segment. If a firewall or VLAN separates them, port 502 TCP must be explicitly allowed. Also verify the slave address in the portal matches the one set in the mySigen app.
The power register returns zero even when panels are producing. What is wrong?: Check that the Modbus TCP Server Enable switch is saved and still active in the mySigen app, as it can revert after a firmware update. Also confirm you are polling slave address 247 for plant-level data or the individual inverter's slave address for device-level data, as mixing these returns zeros or errors.
Why does register 30035 return a large negative number at night?: The power register is a signed int32. A negative value at night is normal if the inverter reports a small standby draw or measurement offset. Treat values near zero as idle, and apply a threshold in your alert rule rather than treating any negative reading as a fault.
Modbus stops responding after a few hours. What should I check?: Sigenergy inverters can drop the Modbus TCP connection if the polling interval is too aggressive or if the connection is not cleanly closed between requests. Set the ModbusCloud Gateway poll interval to at least 10 seconds and ensure the TCP session is closed after each transaction to avoid exhausting the inverter's connection slots.

Registers (1)

1 read / 0 write

Name	Address	Function	Type	Unit	Access
power Inverter active power output, signed integer in watts.	30035	FC03	int32	W	R

Working with Modbus in your projects?

ModbusCloud is the hardware-plus-software platform that installers use to monitor, visualise and control Modbus devices from one portal. This template is one of hundreds you can use right away.

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Specifications

Protocol: Modbus TCP
Brand: Sigenergy
Registers: 1
Compatible models: Sigen HybridSigen PV MaxSigenStore EC
Last updated: 23 April 2026

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