Fronius Verto: flexibility and safety for C&I systems

The Fronius Verto is Fronius’ answer to the growing demand for European three-phase string inverters for C&I installations compliant with CEI 0-21.

Designed to ensure maximum adaptability, safety, and ease of integration, Verto is a complete solution ready to meet the challenges of the new generation of smart photovoltaic systems.

Uncompromising flexibility

The flexibility of the Fronius Verto is evident in its ability to configure even the most complex systems, thanks to the capability of managing up to 6 or 8 strings per inverter.
This is made possible by:

  • 3 or 4 MPPTs, depending on the power level
  • high current limits, kept consistent across all inverter versions, from the smallest 15 kW model to the 33.3 kW version
  • extended compatibility with different photovoltaic field configurations

From the most compact 15 kW version to the more powerful 33.3 kW model, every Verto inverter ensures top efficiency and design flexibility.

Advanced safety and Fronius reliability

Safety has always been one of the strengths of Fronius technology.
The Verto inverter integrates innovative solutions for both system protection and cybersecurity:

  • Arc Guard Technology against arc faults
  • Fronius cybersecurity systems protecting user data, servers, and the corporate cloud
  • IP66 protection rating, enabling installation even in outdoor environments

Moreover, Verto complies with major industry standards, including:

  • IEC 62109-1/-2
  • VDE-AR-N 4105:2018
  • R25
  • IEC 61643-31/-11 (surge protection)

Practicality and smart integration

The practicality of Fronius Verto lies in its ability to easily integrate with other systems and devices, including:

This enables the creation of complete photovoltaic energy systems, fully coordinated with load management and e-mobility technologies.

Main technical specifications

Fronius Verto is available in versions from 15 kW to 33.3 kW, including intermediate sizes of 17.5, 20, 25, 27, and 30 kW.

Versions above 25 kW

  • 4 MPPTs with two DC connections per MPPT
  • Maximum current per MPPT: 28 A
  • Short-circuit current per MPPT: 50 A
  • MPPT voltage range: up to 870 V
  • Maximum voltage: 1000 V

Versions below 25 kW

  • 3 MPPTs (one with dual DC connection)
  • Same voltage and current specifications as the higher-power versions

Thanks to this consistent architecture, all Verto inverters offer the same level of flexibility and compatibility, regardless of power size.

Warranty and reliability

Each Fronius Verto inverter comes with:

  • A 2-year standard warranty

  • Free warranty extension by registering on Solar.web

The IP66 protection rating enables safe outdoor installation, ensuring resistance to dust and water and long-term durability.

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Fronius Verto – three-phase string inverter


The Fronius Verto series is a flexible and safe solution for medium-sized commercial and industrial photovoltaic systems. Available in power classes from 25.0 to 33.3 kW, it is ideal for new installations or the expansion of existing systems.

  • 4 MPPTs (with 2 inputs each)
  • Integrated arc fault protection (AFCI)
  • SPD type 1+2 on AC and DC side
  • Integrated DC circuit breaker
  • Communication: LAN, WLAN, RS485
  • Up to 7 years basic warranty (extendable)

Datasheet English

Datenblatt Deutsch

Fiche technique Français

Ficha de datos Español

Arkusz danych Polski

Complete documentation

Flexibility and optimisation

Thanks to the SuperFlex Design with 4 MPPTs and a wide input voltage range (150 – 870 V), the Fronius Verto easily adapts to installations with different module inclinations or orientations, even allowing the use of high-current modules. The inverter integrates the Dynamic Peak Manager algorithm, which optimises system performance even in partial shading, ensuring maximum energy production.

Advanced safety

Fronius Verto features type 1+2 surge protection devices (SPD) on both the AC and DC sides and an integrated arc fault protection system (Fronius Arc Guard), improving system safety and reducing the risk of component damage or fire.

Simplified installation

The inverter’s design provides a large, protected connection area, simplifying the work of installers. It can be mounted either on the wall or on a flat surface (via an optional kit), offering greater flexibility during installation.

Additional features

  • Protection class IP66
  • Maximum DC input voltage: 1000 V
  • Maximum efficiency up to 98.03%.