30 Product manual - PVS-175-TL;A.1 Version
EN
3.9 Characteristics of a photovoltaic generator
A PV generator consists of an assembly of photovoltaic modules that transform solar radiation into DC
electrical energy and can be made up of:
• Strings: number (X) of PV modules connected in series
• Array: group of X strings connected in parallel.
The string technology was developed to significantly reduce the installation costs of a photovoltaic
system that are mainly associated to wiring on the DC side of the inverter and subsequent distribution on
the AC side.
A photovoltaic panel consists of many photovoltaic cells mounted on the same support.
A string consists of a certain number of panels connected in series;
An array consists of two or more strings connected in parallel.
Large photovoltaic systems can include multiple arrays connected to one or more inverters.
NOTE – D The greater the number of panels in each string, the lower the cost and the less
complex the wiring connections of the system.
Cell Module String Array
ATTENTION – A The current of each array must fall within the rating value limits of the inverter.
ATTENTION – A The inverters referred to in this document are TRANSFORMERLESS. This type
requires the use of insulated photovoltaic panels (IEC61730 Class A Rating) and the need to
keep the photovoltaic generator floating with respect to ground: no terminal of the generator
must be connected to ground.
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