Flexi 3.0 Three-Phase PV String Inverter 30-60kW

A photovoltaic inverter is the central component of a solar system: it converts the direct current (DC) produced by the solar panels into 230/400V alternating current (AC), the only form of electricity usable by domestic users, businesses and the electricity grid.

But it's not just about conversion: it also manages communication with the grid for feeding in surplus energy, monitors system performance in real time, applies MPPT (Maximum Power Point Tracking) algorithms to extract the maximum possible power from the panels under any irradiation conditions, and intervenes in the event of anomalies or faults by interrupting the grid connection to ensure the safety of technicians and people.

The choice of inverter is based on four fundamental parameters that must be aligned with the characteristics of the system.

The first is power: the inverter must have a nominal power at least equal to or slightly less than the PV system's power – a 30-60kW three-phase string Flexi 3.0, for example, is designed for systems from 30kW to 60kW peak.

The second is input voltage and current: the system's strings must fall within the inverter's MPPT range (in the case of the Flexi 3.0 string: 200-1000V, current up to 40A per input).

The third is the number of MPPTs and strings: more MPPT trackers mean greater flexibility in panel orientation – the 30-60kW model has 2-4 MPPTs with 5-8 strings.

The fourth is grid voltage and certifications: the inverter must be certified for the grid standard of the country of installation – in Italy, at least EN50549-1 and C10/C11 are required.

The Flexi 3.0 Three-Phase PV String Inverter 30-60kW is a pure string inverter, designed exclusively for DC-AC conversion of photovoltaic energy and connection to the electrical grid. It does not have a battery port or a communication interface with storage systems — this is the technical boundary that separates it from the hybrid inverters in the same series.

Without storage: The Flexi 3.0 Three-Phase PV String Inverter 30-60kW is a pure string inverter, without a battery port, and is not compatible with storage systems. It is the ideal choice for those who already have an upstream storage system installed, or for those who do not need one — the focus is entirely on maximizing PV conversion with efficiency up to 99% and stable output up to 60kW.

If storage is needed: It is necessary to opt for the Flexi 3.0 Three-Phase Hybrid Storage Inverter (PDT series), which has a dedicated battery port with a voltage of 150-800V and charge/discharge power up to 60kW, compatible with the GONEO Vault SG high-voltage stackable energy storage system for integrated management of production, storage, and consumption.

The substantial difference is that a string inverter does not have a battery port, whereas a hybrid inverter does. Beyond this seemingly simple distinction, there is a strategic difference in choosing the system.

A string inverter is the optimal solution when the sole objective is PV production: it maximizes solar energy conversion with high efficiencies (up to 99% for MPPT, 98.8-99% European for the 30-60kW Flexi 3.0 string inverter), is simpler to install, and is suitable for utility-scale or large commercial systems. It does not manage storage or function as a backup.

A hybrid inverter, on the other hand, is the choice for those who want to maximize self-consumption, have power even during blackouts, or take advantage of favorable tariffs: it adds battery management, an off-grid switch, and tariff optimization functions. In summary: the string inverter specializes in production, while the hybrid is a complete energy system.