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Fronius Symo 4.5-3-M — a compact three-phase inverter with a capacity of 4.5 kW, suitable for small private and commercial solar power plants. Thanks to two MPPT trackers and SuperFlex Design technology, this device operates efficiently even on complex roof shapes. The inverter features a built-in web server, full support for Modbus TCP/RTU, API, and Fronius Solar.web, and is also fully compatible with Victron Energy hybrid systems via AC coupling.
Key advantages of the Fronius Symo grid-tied inverter
- Maximum efficiency of 98%, European standard – 96.5%
- Two independent MPPT for complex panel configurations
- Built-in Wi-Fi, Ethernet, Modbus TCP/RTU, and JSON API
- Reliable protection: IP65, active fan cooling
- Full compatibility with Victron Energy systems
- Dynamic generation limitation (Zero Feed-in)
Technical Features
- Rated power: 4500 W
- Input voltage range: 150–1000 V
- MPPT operating range: 150–800 V
- Maximum MPPT current: 2 × 16 A
- DC connections: 2+2 inputs, screw terminals
- AC connection: 3~NPE 400/230 V or 380/220 V
- Standby power consumption < 1 W
- Weight: 19.9 kg
- Temperature range: from -25°C to +60°C
- Made in Austria
Application scenarios
- Private 3-phase rooftop PV systems
- Installations with multiple roof planes or partial shading
- Small businesses and office buildings with self-consumption
- Hybrid solar systems with Victron ESS (via AC coupling)
Service support in Ukraine
Total-Energo LLC is an official Fronius partner in Ukraine. We provide full project support: from inverter selection and installation to technical support, warranty, and post-warranty service.
Communication and monitoring interfaces
- WLAN / Ethernet LAN – Fronius Solar.web, Modbus TCP SunSpec, Fronius Solar API (JSON)
- RS485 Modbus RTU – for meters or compatible controllers
- USB-A – for firmware updates or log export
- 2× RS422 (RJ45) – Fronius Solar Net
- 6 inputs and 4 digital inputs/outputs – load control or external relays
- S0 interface – support for metering meters
- Potential-free relay – integration into energy management systems
- AC coupling with Victron Energy – allows synchronization of the grid-tied inverter with Victron MultiPlus or Quattro. This connection is implemented via a common AC connection point (AC bus).