huawei – Qilowatt https://docs.qilowatt.eu/en/ Thu, 30 Oct 2025 10:03:32 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 https://docs.qilowatt.eu/wp-content/uploads/2025/08/cropped-cropped-527027273_25002846699317774_491633004174988328_n-32x32.webp huawei – Qilowatt https://docs.qilowatt.eu/en/ 32 32 Huawei SUN2000 https://docs.qilowatt.eu/en/docs/huawei-sun2000/ Tue, 02 Sep 2025 10:24:15 +0000 https://docs.qilowatt.eu/docs/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
• 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).

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.
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