---
title: Solis S6
description: "## 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 • Inverter and battery firmware are updated (latest version must…"
url: "https://docs.qilowatt.eu/en/docs/solis-s6/"
updated: "2026-10-26"
category: "3. Inverter Installation - pick the right one"
---

# Solis S6

## 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

 • 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](https://docs.qilowatt.eu/en/docs/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

 ↓ Solis S6 3-10kW HV; Solis S6 8-15kW LV ↓ ![](https://docs.qilowatt.eu/wp-content/uploads/2025/09/photo_2025-11-10_13-28-31.jpg) ↓ Solis S6 12-20kW HV ↓ ![](https://docs.qilowatt.eu/wp-content/uploads/2025/09/photo_2025-11-10_13-28-26.jpg) Solis S6 30–125 kW must be connected to the EMS port, not RS485. (If the battery is a Dyness BF100, the Qilowatt controller must be connected to the EMS port, the battery BMS cable to the BMS port, and the battery EMS cable to the RS485 port.)  ![](https://docs.qilowatt.eu/wp-content/uploads/2025/09/photo_2025-11-10_13-28-31.jpg) ![](https://docs.qilowatt.eu/wp-content/uploads/2025/09/photo_2026-10-26_13-22-21.jpg)

### 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. ![](https://docs.qilowatt.eu/wp-content/uploads/2025/09/7ee8933d-ff39-470a-9954-ed9a047db55c.png) **2)**Storage Mode → Charge & Discharge time slots must be turned OFF. ![](https://docs.qilowatt.eu/wp-content/uploads/2025/09/a717f2d7-a2a1-4512-9bb1-1f52a0b2bd01.png) ![](https://docs.qilowatt.eu/wp-content/uploads/2025/09/92b0e6d1-1d08-4e21-ab19-fb5ce6638e08.png) **3)** We recommend turning OFF Battery Saving, located under Battery Settings. This setting limits battery usage and reduces charging and discharging power.  ![](https://docs.qilowatt.eu/wp-content/uploads/2025/09/b9e223e8-9843-4d6c-ac6c-fbdd0d530d55.png) **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.  ![](https://docs.qilowatt.eu/wp-content/uploads/2025/09/561ceaf2-fc25-418f-83c3-c583957126ee.png)

## 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](mailto:support@qilowatt.eu)