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Huawei Inverter Configuration Guide

How to connect Huawei inverters to Sourceful Zap via Modbus TCP or Modbus RTU (RS485).

Updated 2026-06-02Read in Svenska

The Sourceful Zap supports two connection methods for Huawei inverters: Modbus TCP (via SDongle and network) and Modbus RTU (via RS485 direct wiring). These are mutually exclusive — the dongle must be disconnected when using RTU.

Compatible Models

  • SUN2000 3-10KTL M0/M1

  • SUN2000 12-25K MB0

  • SUN2000 5-12K MAP0

Modbus TCP (via SDongle)

Prerequisites

Hardware Requirements

  • Mobile device

    • iPhone with iOS 10.0 or later

    • Android with Android 4.0 or later

  • Huawei SDongle

  • Internet connectivity

  • WiFi capability

Software Requirements

  • SUN2000 App (version 3.2.00.015 or later)

  • Available from Huawei AppGallery

Configuration Process

Initial Setup

  1. Install SUN2000 App from Huawei AppGallery

  2. Ensure SDongle remains powered throughout configuration

Connection Setup

  1. Open SUN2000 App

  2. Select Connect → WLAN

  3. Choose inverter's WiFi network

  4. Enter password:

    • First login: Changeme

    • Change password after initial login

Modbus TCP Configuration

  1. Login as installer (default password: 00000a )

  2. Navigate to: Settings → Communication Configuration → Dongle Parameter Settings → Modbus-TCP

  3. Select appropriate access mode:

    • Unrestricted : Allows all LAN devices (one at a time)

    • Restricted : Requires setting trusted IP address

    • Disabled : No Modbus access

Important Notes

  • Configuration settings persist through power cycles

  • New inverters require fresh configuration

  • SDongle replacement doesn't require reconfiguration

  • Keep SDongle powered during configuration process

To verify your Modbus TCP connection is working, see How do I know if Modbus TCP is activated on my inverter?

Modbus RTU (via RS485)

Note: Modbus RTU requires disconnecting the SDongle. With the dongle disconnected, the connection to FusionSolar is lost. Do not reconnect the dongle while the system is in operation.

Prerequisites

  • Sourceful Zap

  • Shielded twisted pair cable

  • Only one inverter is supported — the inverter must not be cascaded with another inverter. If such a connection exists, disconnect it before installation.

Wiring

Zap Side

Strip one end of the twisted pair cable. Use the green pair:

  • Connect green wire to the Zap A+ terminal

  • Connect green/white wire to the Zap B- terminal

Inverter Side

Ensure the dongle is disconnected before connecting.

Connect to the COM port on the bottom of the inverter:

  • Green wire → terminal 1 (485A1-1)

  • Green/white wire → terminal 3 (485B1-1)

Troubleshooting

Modbus TCP

If Modbus settings are not visible:

  1. Check firmware versions

  2. Update app if necessary

  3. Verify SDongle compatibility

Connection Problems

If unable to connect:

  1. Ensure SDongle is powered

  2. Stay within WiFi range

  3. Verify correct password

Access Issues

If experiencing access problems:

  1. Check IP restrictions if enabled

  2. Verify only one client is connecting

  3. Confirm network settings are correct

Modbus RTU

If RS485 communication is not working:

  1. Verify the dongle is disconnected

  2. Ensure the inverter is not cascaded with another inverter

  3. Double-check COM port terminal connections (terminal 1 and 3)

  4. Ensure all cable connections are firmly seated

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