KNX gateway for Sungrow Hybrid Inverters
KNX gateway for Sungrow Hybrid inverters enabling real-time solar production and battery storage monitoring on KNX. Transfers comprehensive AC/DC power and energy data via Modbus TCP over Ethernet for intelligent energy management and building automation.
Overview
The INV-KNX-SUH is a professional KNX gateway designed for seamless integration of Sungrow Hybrid solar inverters into KNX building automation installations. This interface enables real-time transfer of all relevant inverter and battery data to the KNX bus via Modbus TCP over Ethernet, allowing integrators to implement intelligent energy management, consumption optimization, and automated building responses based on solar production and battery status.
Technical Capabilities
The gateway communicates with Sungrow Hybrid inverters using the Modbus TCP interface over Ethernet (RJ45). Data is polled at a configurable refresh rate (1-255 minutes) and transmitted to the KNX bus through dedicated group objects. The device supports both single-phase and three-phase AC network configurations.
Inverter Communication Objects
The following KNX group objects are available for monitoring Sungrow Hybrid inverter data:
| GO | Name | Description |
|---|---|---|
| 4 | AC Current A | AC Current phase A |
| 5 | AC Current B | AC Current phase B |
| 6 | AC Current C | AC Current phase C |
| 8 | AC Voltage AB | AC Voltage phase AB |
| 9 | AC Voltage BC | AC Voltage phase BC |
| 10 | AC Voltage CA | AC Voltage phase CA |
| 24 | AC Power | AC Power output |
| 25 | DC Power | DC Power input |
| 26 | AC Frequency | AC Frequency |
| 28 | AC VAR | AC Reactive power |
| 29 | AC PF | Power factor |
| 30 | AC Energy | Total AC Energy |
| 33 | Temperature | Cabinet temperature |
| 40 | Daily Energy Yield | Daily energy production |
| 42 | Battery 1 Power | Charging (>0) / Discharging (<0) |
| 43 | Battery 1 SOC | Battery state of charge (%) |
| 44 | Battery 1 Current Day Charge | Daily charge energy |
| 45 | Battery 1 Current Day Discharge | Daily discharge energy |
| 46 | Battery 1 Total Charge | Cumulative charge energy |
| 47 | Battery 1 Total Discharge | Cumulative discharge energy |
The gateway includes a built-in KNX logic module supporting up to 64 configurable logic functions including logic gates with 8 inputs, 4-step sequences, triggers with weekly calendar events, and math operations for advanced energy calculations.
Installation and Configuration
The compact 2 SU DIN-rail module requires an external 12-30VDC power supply connected via screw terminal. The Ethernet connection to the inverter network uses a standard RJ45 connector. The KNX bus connects via a pluggable micro terminal with push-wire connection for 0.6-0.8mm solid conductor wire.
Network configuration is performed via the built-in web interface. The gateway connects to the Sungrow Hybrid inverter over the local Ethernet network using Modbus TCP protocol. ETS configuration includes AC network type selection (single/three-phase), refresh rate (1-255 minutes), battery monitoring options, and timezone settings for logic functions. The inverter model parameter should be set to 19 for Sungrow Hybrid inverters. The free ETS Demo version is fully supported.
Applications
Residential solar installations benefit from real-time production monitoring displayed on KNX visualization panels. Automation scenarios can trigger load activation (EV charging, water heating, pool pumps) when solar generation exceeds consumption thresholds. Battery state-of-charge monitoring enables intelligent backup power management with Sungrow hybrid systems.
Commercial buildings leverage the gateway for energy management dashboards showing real-time solar contribution, battery charge/discharge status, and efficiency metrics. Integration with KNX HVAC control enables thermal storage optimization during peak solar production.
Self-consumption optimization scenarios use AC power and battery data to automatically route surplus solar energy to controllable loads or storage before grid export, maximizing on-site consumption and reducing electricity costs.
Compatibility and Integration
The INV-KNX-SUH is compatible with Sungrow Hybrid inverter series including SH5K-20, SH3K6, SH4K6, SH5K-V13, SH5K-30, SH3K6-30, SH4K6-30, SH5.0RS, SH3.6RS, SH4.6RS, SH6.0RS, SH10RT, SH8.0RT, SH6.0RT, and SH5.0RT models. All models compatible with Modbus TCP. The gateway integrates with any KNX TP installation and is fully configurable using ETS5 or ETS6, including the free ETS Demo version.
The device provides galvanic isolation between the KNX bus and the Ethernet/inverter circuitry. Firmware updates are available via the built-in web interface. The gateway follows the unified Elausys inverter gateway architecture, ensuring consistent integration patterns with HyperVisu visualization servers and other KNX system components.
