I see zero values for all registers. What should I check?

Confirm that Modbus TCP is enabled on the SigenStor inverter. Check that the gateway and inverter are on the same network and that the correct IP address and port are configured in the template.

Grid power and storage power show unexpected negative values. Is this normal?

Yes. These registers are signed int32 values. A negative value typically indicates power flowing in the opposite direction, for example grid export instead of import, or battery discharge instead of charge.

Which SigenStor models are supported by this template?

The template is compatible with all SigenStor models in the 5 kW to 25 kW range. Register addresses are consistent across this product family.

Do I need to configure byte order or word swap for the int32 registers?

The template is preconfigured with the correct byte order for SigenStor inverters. If you experience implausible readings, verify that the gateway is set to big-endian (high word first), which is the standard for Sigenergy devices.

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Free Modbus template: Sigenergy SigenStor Plant | ModbusCloud

///Sigenergy SigenStor Plant

Modbus TCP

Sigenergy SigenStor Plant

Name: Sigenergy SigenStor Plant
Brand: Sigenergy
SKU: 1f65630e-3697-46be-a88a-ae2bbec44db1

Sigenergy

Monitors SigenStor energy storage system via Modbus TCP

Overview

This template reads key energy metrics from a Sigenergy SigenStor inverter (5 to 25 kW) via Modbus TCP. It provides state of charge, grid power, PV power, and storage power. No control registers are included.

Key readings

SOC
Grid Power
PV Power
Storage Power

Use cases

Monitor real-time PV production and battery state of charge on a cloud dashboard for your customer.

Create an alert when battery SOC drops below a defined threshold during peak hours.

Track grid import and export power to verify self-consumption optimization over time.

Generate weekly or monthly energy reports for residential SigenStor installations.

Verify correct system operation remotely after commissioning a new SigenStor inverter.

Installation

1Enable Modbus TCP on the SigenStor inverter using the local configuration interface or the Sigenergy commissioning app.
2Connect the ModbusCloud gateway (MCG or MLP series) to the same local network as the SigenStor inverter.
3Note the IP address assigned to the SigenStor inverter and confirm the Modbus TCP port (typically 502).
4Import the Sigenergy SigenStor Plant template in the ModbusCloud platform and enter the inverter IP address and port.
5Verify that SOC, grid power, PV power, and storage power values appear correctly on the live dashboard.

Things to watch for

I see zero values for all registers. What should I check?: Confirm that Modbus TCP is enabled on the SigenStor inverter. Check that the gateway and inverter are on the same network and that the correct IP address and port are configured in the template.
Grid power and storage power show unexpected negative values. Is this normal?: Yes. These registers are signed int32 values. A negative value typically indicates power flowing in the opposite direction, for example grid export instead of import, or battery discharge instead of charge.
Which SigenStor models are supported by this template?: The template is compatible with all SigenStor models in the 5 kW to 25 kW range. Register addresses are consistent across this product family.
Do I need to configure byte order or word swap for the int32 registers?: The template is preconfigured with the correct byte order for SigenStor inverters. If you experience implausible readings, verify that the gateway is set to big-endian (high word first), which is the standard for Sigenergy devices.

Registers (4)

4 read / 0 write

Name	Address	Function	Type	Unit	Access
SOC	30014	FC03	uint16	%	R
Grid Power	30005	FC03	int32		R
PV Power	30035	FC03	int32		R
Storage Power	30037	FC03	int32		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.

See the live demo How it works

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Specifications

Protocol: Modbus TCP
Brand: Sigenergy
Registers: 4
Compatible models: SigenStor 5-25KW
Last updated: 17 April 2026

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