3. Inverter Installation – pick the right one – Qilowatt

Deye / Sunsynk / Sol-Ark

marko — Thu, 28 Aug 2025 17:37:08 +0000

Introduction

Deye, Sunsynk and Sol-Ark inverters can be connected to the Qilowatt system using a Modbus module. This guide explains the necessary settings, wiring connections, and how to start the module.

Prerequisites

• A technician has verified that the inverter is operating correctly
• The inverter is able to charge batteries from the grid and, if permitted, sell energy back to the grid
• Battery maximum power limits are taken into account
• A Modbus R1 or R2 module is available
• Required tools and a communication cable (CAT5 or CAT6)

Step-by-step Guide

Inverter settings

1. Open Deye inverter menu.
2. Configure the following settings:
• Modbus SN (address): 01
• Master/Slave: Slave
• Modbus baudrate: 9600
• Time of Use: activated

Installing the module

1. Install the MODBUS module according to the installation manual.
2. Connect the communication cable (CAT5 or CAT6) from the module’s RS485 A and B terminals to the corresponding inverter port.

⚠️ Important!
• If the inverter mainboard has a DRM port:
Connect the MODBUS R2 module terminals A and B to the inverter BMS port pins:
• Pin 1 → B+
• Pin 2 → A-
If the BMS port is already in use by the battery, use the Y-splitter included in the installation kit.

• If the inverter does not have a DRM port:
Connect the MODBUS R2 module terminals A and B to the inverter Modbus port pins:
• Pin 7 → A-
• Pin 8 → B+

Starting the module

1. Switch on the circuit breaker of the MODBUS R1 / R2 module (or insert the fuse).
2. Check if the module’s white LED indicator starts flashing rapidly.
3. Connect the module to your home WiFi network → Connecting the device to WiFi.
4. Place the module in a location with a strong WiFi signal.
5. If needed, use a WiFi range extender.

Result

The inverter is successfully connected to the Qilowatt system. The Modbus module transmits data and enables device control and optimization.

If it Doesn’t Work

• If the LED indicator does not light up, check the connections and circuit protection.
• If communication does not work, verify that the Modbus address and baudrate are set correctly.
• If the module does not connect to WiFi, follow the guide → Resetting WiFi settings
• If the issue persists, contact our team: support@qilowatt.eu.

Fronius

marko — Thu, 28 Aug 2025 17:38:03 +0000

Introduction

Fronius inverters can be connected to the Qilowatt system using a Modbus module. This guide explains the necessary settings, module installation, and startup steps.

Prerequisites

• The inverter is operational and configured according to the manufacturer’s instructions
• A Modbus R1 or R2 module is available
• Required tools and a communication cable (CAT5 or CAT6)
• A Qilowatt account has been created and the app is ready for adding devices → Creating a user account

Step-by-step Guide

Configuring the inverter in the Fronius web interface

1. Open the Fronius web interface and go to the Modbus Data Export view.
2. Configure the following settings:
• Modbus RTU Interface 1: slave
• Baud Rate: 9600
• Parity: none
• SunSpec Model Type: int + PF
• Inverter Address: 3
• Inverter Control via Modbus: On

Installing the module

1. Install the MODBUS R1 / R2 module according to the installation manual.
2. Connect the communication cable (CAT5 or CAT6) between the module’s RS485 port and the inverter’s Modbus port:
• M1+ → A
• M1- → B

Starting the module

1. Switch on the circuit breaker of the MODBUS R1 / R2 module (or insert the fuse).
2. Check if the module’s white LED indicator starts flashing rapidly.
3. Connect the module to your home WiFi network → Connecting the device to WiFi.
• Place the module where the WiFi signal is strong.
• Use a WiFi range extender if necessary.

Result

The Fronius inverter is successfully connected to the Qilowatt system. The Modbus module transmits data and enables device control and energy optimization.

If it Doesn’t Work

• If the LED indicator does not light up, check the connections and circuit protection.
• If communication does not work, verify that the Modbus settings in the web interface are correct.
• If the module does not connect to WiFi, follow the guide → Resetting WiFi settings.
• If the issue persists, contact our team: support@qilowatt.eu.

Solax X1/X3/Ultra

Qilowatt Support — Tue, 02 Sep 2025 09:44:55 +0000

Introduction

Solax inverters can be connected to the Qilowatt system via Modbus communication. This guide explains the required preparations, RS485 wiring, inverter settings, operating modes, and the importance of firmware updates.

Prerequisites

• Inverter and battery firmware are up to date
• A Modbus module is available
• Required tools and a communication cable (CAT5 or CAT6)
• A Qilowatt account has been created and the app is ready for adding devices → Creating a user account

Step-by-step Guide

1. Preparation

• Update the inverter and battery firmware before connecting.
• Ensure you are using the latest manufacturer version, since Qilowatt always relies on the newest Modbus protocol.

2. RS485 connections

Solax X1/X3 inverter COM port:
• Pin 4 → RS485 A
• Pin 5 → RS485 B
Use Pin 4 (A) and Pin 5 (B) to connect the Qilowatt device.

Solax Ultra inverter RS485 port:
• Pin 1 → RS485 A
• Pin 2 → RS485 B
Pin numbers may vary by model – always check the specific device manual.

3. Inverter settings

• Unlock password: 2014
Solax is the only manufacturer that requires an Unlock Password for Modbus control. If the password is changed, Qilowatt will no longer be able to control the inverter.
• Modbus address: 1 (default)
• Baud rate: 9600
The inverter default Baud rate is 19200. For communication with Qilowatt, this must be changed to 9600. If needed, the Qilowatt support team can adjust this in the Qilowatt device as well.

Modbus address and Baud rate settings can also be modified via the Solax SolarCloud app.

4. Operating modes

• Mandatory step: enable battery usage
Discharge period: 00:00–23:59
Charge period: 00:00–00:00
• Installer password: 2014
Test whether you can access Remote control in Solax Cloud with this password.
• Disable all remote controls, AI features, and time-of-use schedules to avoid conflicts.
• Operation takes place in Back-Up mode.
! In Self-use mode, the inverter will not accept commands if the battery is empty.
• The Solax Datahub must be removed – even if not actively controlling, it interferes with communication.

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

If it Doesn’t Work

• If RS485 communication does not work, check that you used the correct pins according to the model.
• If communication still fails, verify the Modbus address and Baud rate values.
• If control is not functioning, make sure the Unlock Password is still set to 2014.
• If the issue persists, contact our team: support@qilowatt.eu.

Huawei SUN2000

Qilowatt Support — Tue, 02 Sep 2025 10:24:15 +0000

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.

GoodWe ET / ET Plus

Qilowatt Support — Tue, 02 Sep 2025 10:58:25 +0000

Introduction

GoodWe ET and ET Plus hybrid inverters can be connected to the Qilowatt system via Modbus communication. This guide explains the necessary preparations, RS485 wiring, inverter settings, and operating modes.

Prerequisites

• Inverter and battery firmware are updated (latest version must be used)
• A Modbus module is available
• Required tools and a communication cable (CAT5 or CAT6)
• A Qilowatt account has been created and the app is ready for adding devices → Creating a user account

Step-by-step Guide

1. Preparation

• Update the inverter and battery firmware before connecting.
• Ensure the device has the latest firmware, since Qilowatt always relies on the newest Modbus protocol.

2. RS485 connections

GoodWe ET 5–10 kW hybrid inverter (COM port):
• Pin 1 → RS485 A1
• Pin 2 → RS485 B1
Use Pin 1 (A) and Pin 2 (B) to connect the Qilowatt device.

Note: Before installation, make sure the device has a Data port.

GoodWe ET 15–30 kW hybrid inverter (EMS port):
• Pin 1 → RS485 A
• Pin 2 → RS485 B
• Pin 4 → GND
• Pin 5 → CAN_L
• Pin 6 → CAN_H
Use Pin 1 (A) and Pin 2 (B) to connect the Qilowatt device.

3. Inverter settings

• Modbus address: 247 (default)
• Baud rate: 9600 (default)

If needed, the Modbus address can be changed via the GoodWe SEMS or Solar-Go apps.

4. Operating modes

• Set the inverter to Self-use mode (in older systems called General).
• Disable all modes that prevent external control:
TOU (time-of-use)
ECO
Peak Shaving
All remote controls

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 GoodWe ET / ET Plus 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 does not work, check the RS485 connections and confirm that the port is available.
• If control does not function, make sure the inverter is in Self-use mode and that all other modes (TOU, ECO, Peak Shaving) are disabled.
• If the Modbus address is incorrect, change it using the SEMS or Solar-Go app.
• If the issue persists, contact our team: support@qilowatt.eu.

Solis S6

Qilowatt Support — Thu, 18 Sep 2025 11:54:07 +0000

Introduction

Solis S6 inverters can be connected to the Qilowatt system via Modbus communication. This guide explains the necessary preparations, RS485 wiring, inverter settings, and operating modes.

Prerequisites

Step-by-step Guide

1. Preparation

• Update the inverter and battery firmware before connecting.
• Ensure the device has the latest firmware, since Qilowatt always relies on the newest Modbus protocol.

2. RS485 connections

↓ Solis S6 3-10kW HV; Solis S6 8-15kW LV ↓

↓ Solis S6 12-20kW HV ↓

Solis S6 30-125 kW tuleb ühendada EMS porti, mitte RS485. (Juhul kui akuks on Dyness BF100, tuleb Qilowatti kontroller ühendada EMS porti, Aku BMS kaabel BMS porti ja aku EMS kaabel RS485 porti.)

3. Inverter firmware and SolisCloud settings

It is critical to update the inverter firmware after installation.
All firware components must be updated: DSP firmware, HMI firmware, Major firmware and all other inverter firmware components.

All SolisCloud control functions must be turned OFF.
If any of the following functions are enabled in SolisCloud, it is not possible to control the inverter.

1) Solis AI, Peak Valley Arbitrage, Solis EMS and other automatic control functions must be turned OFF.

2) Storage Mode → Charge & Discharge time slots must be turned OFF.

3) We recommend turning OFF Battery Saving, located under Battery Settings. This setting limits battery usage and reduces charging and discharging power.

4) We recommend turning OFF Battery ECO Function, located under Settings -> Function Settings. With some battery systems, it is not possible to charge the battery when it is empty and no PV production is available.

Result

Solis S6 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 does not work, check the RS485 connections
• If the issue persists, contact our team: support@qilowatt.eu