The experimental photovoltaics plant has a total capacity of 13 kW, consists of a total of 400 30-cell monocrystalline silicon photovoltaic modules equipped with aluminum frames, of which only 396 are electrically connected.

The photovoltaic modules are connected in series so as to form groups called strings.

The plant is divided into 5 fields named C6, C7, C8, C9 and C10 and 8 subfields consisting of a variable number of modules and equipped with their own inverters (for a total of 8 inverters).

In addition to the photovoltaic modules, the plant is equipped with inverters that functionally divide the plant into the same number of subfields consisting of a variable number of modules each.

The apparatus for converting electricity from direct current to alternating current consists of 8 inverters, connected to the existing three-phase power line and appropriately balancing the output powers from the inverters.

The photovoltaic plant is equipped with a data acquisition system, which uses both measurements of electrical quantities provided by the inverter and those provided by appropriate electrical and meteorological sensors.

Operating data are collected and processed to determine the performance of the system in accordance with standard CEI EN 61724 (Survey of the performance of photovoltaic plants – Guidelines for measurement, exchange and analysis of data).

In particular, according to the provisions of this standard, the overall accuracy of the entire measurement chain (sensors + converters) must be better than: 5% for solar irradiance; 1°C for temperature measurement; 2% for measurement of current, voltage, and power.

Measurement accuracy should be maintained over the life of the plant.

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