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Fronius Eco 25.0-3-S — is a three-phase transformerless grid-tied inverter designed specifically for large PV systems. Its maximum efficiency of 98.2%, protection class IP66, and support for both indoor and outdoor installation make it the ideal choice for high-power commercial and industrial facilities. Thanks to its built-in web server, Smart Grid readiness, and JSON API support, the inverter offers maximum flexibility for system monitoring and control. It supports AC synchronization with Victron Energy hybrid inverters.
Key benefits of the Fronius Eco grid-tied inverter
- High efficiency: up to 98.2%
- IP66 — reliable protection for outdoor installation
- Lightweight – only 35.7 kg
- SnapINverter – quick and easy installation
- Built-in web server and data logger
- No need for a string box – built-in fuse holders
- Support for zero feed-in (generation limitation)
Technical Features
- 1 MPPT tracker with an operating range of 580–850 V
- Maximum peak input power from PV array – 37.8 kW
- Wide operating temperature range: from -25°C to +60°C
- Nighttime power consumption < 1 W
- Integrated protection: DC circuit breaker, reverse polarity, RCMU, overvoltage protection (optional)
- Full compatibility with Fronius Solar.web and Fronius Solar API (JSON)
Application scenarios
- Medium- and large-scale industrial solar power plants
- Commercial facilities with a three-phase grid
- Facilities with grid feed-in restrictions
- Hybrid solutions with battery storage — paired with Victron Energy via AC coupling
Service support in Ukraine
Total-Energo LLC is an official partner and service center that provides comprehensive support: from equipment selection and design to installation and Fronius warranty service in Ukraine. We guarantee professional support at all stages of project implementation.
Communication and monitoring interfaces
- LAN / WLAN – connection to Fronius Solar.web, support for Modbus TCP SunSpec, JSON API
- RS485 – support for Modbus RTU SunSpec
- RS422 (RJ45) – Fronius Solar Net
- USB-A – firmware updates, log export
- Digital inputs/outputs – load control, integration with control relays
- Relay output – integration into energy management systems
- AC coupling support with Victron Energy: the inverter is fully compatible with Victron MultiPlus, Quattro, and ESS systems, enabling backup power or self-consumption via batteries.