---
title: Huawei SUN2000
description: "## Introduction Huawei SUN2000 inverters can be connected to the Qilowatt system via Modbus communication. This guide describes the required preparations, connections, and settings to ensure proper operation. ## Prerequisites • A Qilowatt account has been created and the app…"
url: "https://docs.qilowatt.eu/en/docs/huawei-sun2000/"
updated: "2025-10-30"
category: "3. Inverter Installation - pick the right one"
tags:
  - connection
  - huawei
  - installation
  - inverter
  - modbus R1
  - modbus R2
  - setup
---

# Huawei SUN2000

## Introduction

 Huawei SUN2000 inverters can be connected to the Qilowatt system via Modbus communication. This guide describes the required preparations, connections, and settings to ensure proper operation.

## Prerequisites

 • A Qilowatt account has been created and the app is ready for adding devices → [Creating a user account](https://docs.qilowatt.eu/en/docs/creating-a-user-account/)
• Inverter, battery, and Smart Dongle firmware are updated
• Smart Dongle removed (it interferes with Modbus communication)
• A Modbus module is available
• Required tools and a communication cable (CAT5 or CAT6)

## Step-by-step Guide

### 1. Preparation

 • Update the firmware of the **inverter, battery, and Smart Dongle** before connecting.
• Remove the **Smart Dongle**, as it interferes with Modbus communication and control will not work properly.

### 2. RS485 connections

  Always refer to the installation manual of your specific model.

**Huawei SUN2000 M1 (10 kW) COM port:**
• Pin 1 → RS485 A1
• Pin 3 → RS485 B1
• Pin 5 → GND (maandus)
• Pin 7 → RS485 A2 (Smart Meter + battery)
• Pin 9 → RS485 B2 (Smart Meter + battery)
• Pin 13 → GND

For Qilowatt connection, use **Pin 1 (A)** and **Pin 3 (B)**. ![](https://docs.qilowatt.eu/wp-content/uploads/2025/09/Kuvatommis-2025-09-02-131806.png)

### 3. Inverter settings

 • **Modbus address:** 1 (default)
• **Baud rate:** 9600 (default)

If necessary, the Modbus address can be changed by Qilowatt support, but this is not required for standard connections.

### 4. Operating modes

 • Set the inverter to **Self-use** mode.
• In the FusionSolar app, disable all **TOU (time-of-use) modes** to avoid conflicts.

### 5. Why is a firmware update necessary?

 Qilowatt always uses the manufacturer’s latest Modbus protocol. If the inverter or battery firmware is not updated, control may not work correctly.

## Result

 The Huawei SUN2000 inverter is successfully configured and connected to the Qilowatt system. The module transmits data and enables inverter control and energy optimization.

## If it Doesn't Work

 • If communication fails, check the RS485 connections (Pins 1 and 3 must be used correctly).
• If the device does not respond to commands, ensure that the Smart Dongle has been removed.
• If control does not work, verify the Modbus address and Baud rate values.
• If the issue persists, contact our team: [support@qilowatt.eu](mailto:support@qilowatt.eu).