
Modbus TCP
Marstek Venus D (battery)
Marstek
Overview
The Marstek Venus D is an all-in-one AC-coupled home battery system combining an integrated inverter, four MPPT inputs, and modular LFP storage scalable to 15.36 kWh. Designed for residential and small-commercial sites, it charges from solar or the grid and delivers up to 2.2 kW bidirectionally, with an EPS backup function. This Modbus TCP template reads AC power flow, cumulative energy, and state of charge, and exposes four write registers for RS485 control mode, user work mode, force charge/discharge mode, and charge power setpoint. Connecting the Marstek Venus D to the ModbusCloud Gateway gives installers continuous visibility and control from a single portal.
Use cases
- Monitor battery state of charge over time to detect capacity degradation across seasonal cycles.
- Track AC power flow to verify the Marstek Venus D is discharging during expected evening peak hours.
- Alert on state of charge dropping below a configured minimum to catch unexpected overnight drain.



