Modbus RTU
Solinteng wattsonic (battery)
Solinteng
Overview
The Solinteng wattsonic is a hybrid solar inverter with integrated battery storage, sold under several OEM labels including Sunway, Solinteng, A-Tronix, and St-ems. This Modbus RTU template exposes the three most operationally critical registers: real-time battery power (40258), battery state of charge (43000), and the writable minimum-SOC-on-grid setpoint (52503). Together they give you continuous visibility into battery charge and discharge behaviour, and let you set a hard floor on how far the battery drains while the grid is available. For installers running ModbusCloud, this template turns raw RS485 data into actionable dashboard readings without manual register mapping.
Use cases
- Monitor real-time battery power at register 40258 to confirm charge and discharge cycles match the expected schedule.
- Track battery state of charge over days to detect capacity fade or abnormal self-discharge between solar sessions.
- Alert on state of charge falling below a project-specific threshold to prevent deep-discharge events during grid outages.
- Verify that the minimum-SOC setpoint at register 52503 holds the configured floor after firmware updates or inverter restarts.
- Compare battery power readings against site consumption data to report self-sufficiency ratios for building owners.
