Local Integration of Marstek Venus E Battery with Home Assistant for Solar Self-Consumption
By
Helmut10001
Front-window bakery material. Catches the eye, delivers the goods.
Summary
A detailed technical guide documenting the local-only integration of a Marstek Venus E 5kWh AC-coupled battery into an existing 30kWp PV system. The author shares their complete setup process including physical installation using a TV mount, RS485 wiring, Modbus TCP communication, and implementing a "Zero Export" regulation loop using Home Assistant automation. The project emphasizes cloud independence and full local control to improve self-consumption from an existing solar system.
Key quotes
· 4 pulledThe goal: Zero-cloud dependency, full local control via Modbus TCP, and a 'Zero Export' regulation loop using Home Assistant.
In 2020, I took the initiative to install a 30kWp PV system on my own. Over the last 4 years, I achieved a self-consumption rate of roughly 48-50%.
This post covers the physical installation using a standard TV mount, RS485 wiring, and the complete software logic.
Integrating a cheap (~1050€) 5kWh AC-coupled battery into an existing 30kWp PV system.
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