Marstek Modbus Companion

jaden

Published June 15, 2026

133 UCC

18 WCC

55 VAR

Original author: Nerdiy · GermanyOriginal source (new tab)

Components

Hardware components

WIZnet - WIZ850io

x 1

Project description

Marstek Modbus Companion 1. New Content Summary Marstek Modbus Companion is an ESPHome-based gateway project designed to integrate the Marstek Venus E V3.0 battery storage system with Home Assistant. The device communicates with the energy storage system through RS485 using the Modbus RTU protocol and exposes operational data to Home Assistant for monitoring and automation. The project provides a user-friendly web interface, diagnostic tools, status LED indicators, and supports both Wi-Fi and Ethernet connectivity. The Ethernet version utilizes the W5500 controller, making it suitable for…

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