The Fronius Eco series are three-phase grid-tie inverters designed for large commercial and industrial installations, where rapid installation, operational resilience, and stable energy production are essential. The transformerless design combined with its highly sealed IP66 housing enables the equipment to be installed outdoors without additional environmental safeguards. In practice, features such as the SnapINverter service system and integrated string fuse holders allow frequent elimination of separate DC combiner boxes.
Fronius Eco features 1 MPPT-ideal for locations where solar panel strings have similar orientations and minimal, uneven shading occurs. Its high European efficiency translates to better real-world performance under varying loads and temperatures, not just in laboratory conditions.
Monitoring is handled via Fronius Solar.web-communication can occur via Wi-Fi or Ethernet, with views available in the app and web browser. This is not a hybrid inverter, so it is not designed for direct integration with energy storage systems. The series meets required safety and grid connection standards and can be covered by the manufacturer’s warranty (including extensions).
Ranking
Price offers
| Shop | Country | Price | Per kW | Stock | Offer updated | Link to shop |
|---|---|---|---|---|---|---|
| supermercadosolar.es | Spain | 3 171 € incl. VAT | 117.44 €/kW | In stock | 4h ago | Visit shop |
Specifications
Pros and cons
The IP66 protection rating, combined with a non-transformer power supply, allows for direct installation outdoors - without the need for additional protective enclosures. This reduces BOS (Building Owner's System) costs and installation time in typical commercial projects.
Model 25.0-3-S achieves a maximum efficiency of 98.2%, placing the Eco series among the leading string inverters in the 25-27 kW segment. High European efficiency translates into a real annual yield under variable solar irradiation, typical of the Central European climate.
Integrated string combiner box features eliminate the need for separate DC string combiner boxes. This simplifies the installation design, reduces setup time, and lowers material costs in commercial installations with multiple strings.
The SnapINverter mechanical system allows a single person to install and remove the device without specialized tools. In practice, this reduces service downtime, which is crucial in commercial installations where every hour of downtime results in lost production.
The Dynamic Peak Manager (DPM) algorithm regularly scans the entire PV system and identifies the global Maximum Power Point (GMPP), even in the presence of partial shading of the strings. It partially compensates for the limitations of a single MPPT tracker in systems with moderate shading.
The Eco series features a single tracking string with maximum power output (1 MPPT, 580-1000 V DC range). In comparison, the Fronius Symo Advanced in a similar power range offers 2 MPPT, which allows for the use of strings with different orientations or inclines without performance loss. The Eco is only optimal when the modules are in uniform, unshaded areas.
The series includes only two power options (25.0 kW and 27.0 kW). The absence of intermediate models (e.g., 20 kW, 22 kW) makes it difficult to precisely match the inverter to the project and may force the use of an oversized unit or multiple units, which increases installation costs.
The Eco belongs to the SnapINverter generation, which Fronius is progressively replacing with newer lines (Tauro, GEN24 Plus). The Australian CEC certification expired on 01/06/2025, indicating a limited product lifespan. New firmware features and integrations (e.g., Vehicle-to-Grid, advanced energy management) are being developed exclusively for newer platforms.
Alternatives
About the Fronius Eco series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.