A photovoltaic inverter is the central component of a solar power system. It converts the direct current (DC) generated by solar panels into alternating current (AC) at 230/400 V, which is the only form of electricity that can be used by households, businesses, and the power grid.

But it does more than just conversion. It also manages communication with the grid for feeding in excess energy, monitors system performance in real time, applies MPPT (Maximum Power Point Tracking) algorithms to extract the maximum possible power from the panels under different irradiance conditions, and disconnects from the grid in the event of anomalies or faults to ensure the safety of technicians and users.

Choosing the right inverter depends on four key parameters that must match the characteristics of the PV system.

The first is power: the inverter should have a rated power equal to or slightly lower than the PV system capacity. For example, the Flexi 3.0 Three-Phase PV String Inverter 30-60kW is designed for systems with a peak capacity of 30 kW to 60 kW.

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

The third is the number of MPPT trackers and strings: more MPPT trackers provide greater flexibility for different panel orientations. The 30-60kW model offers 2-4 MPPT trackers with 5-8 strings.

The fourth is grid voltage and certification: the inverter must be certified for the grid standard of the installation country. 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-to-AC conversion of photovoltaic energy and connection to the power grid. It does not have a battery port or a communication interface for energy 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 with no battery port and is not compatible with storage systems. It is the ideal choice for users who already have an upstream storage system installed, or for those who do not need storage. Its focus is entirely on maximizing PV conversion, with efficiency up to 99% and stable output up to 60 kW.

If storage is required: Users should choose the Flexi 3.0 Three-Phase Hybrid Storage Inverter (PDT series), which features a dedicated battery port with a voltage range of 150-800 V and charge/discharge power of up to 60 kW. It is compatible with the GONEO Vault SG storage system for integrated management of generation, storage, and consumption.

The essential difference is that a string inverter has no battery port, while a hybrid inverter does. Beyond this apparently simple distinction, there is a strategic difference in system selection.

A string inverter is the optimal solution when the goal is exclusively PV generation. It maximizes solar energy conversion with high efficiency, up to 99% MPPT efficiency and 98.8-99% European efficiency for the Flexi 3.0 PV String Inverter 30-60kW. It is easier to install and is well suited for large commercial or utility-scale systems. It does not manage storage or provide backup operation.

A hybrid inverter, on the other hand, is the right choice for users who want to maximize self-consumption, access power during blackouts, or benefit from favorable electricity tariffs. It adds battery management, off-grid switching, and tariff optimization functions. In short: the string inverter specializes in power generation, while the hybrid inverter is a complete energy system.