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2 - Characteristics
Characteristics of a photovoltaic generator
A PV generator consists of an assembly of photovoltaic panels that tran-
sform solar radiation into DC electrical energy and can be made up of:
Strings: X number of PV panels connected in series
Array: group of X strings connected in parallel
Strings and Arrays
In order to considerably reduce the cost of installing a photovoltaic sy-
stem, mainly associated with the problem of wiring on the DC side of the
inverter and subsequent distribution on the AC side, the string technology
has been developed. 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 be made up of several arrays, connected
to one or more inverters.
By maximizing the number of panels inserted into each string, it is pos-
sible to reduce the cost and complexity of the connection system of the
photovoltaic system.
The current of each array must fall within the limits of the inverter.
To work, the inverter must be connected to the national electricity grid since its operation can
be equated to a current generator that supplies power in parallel with the grid voltage. That is
why inverters cannot support the grid voltage (islanding).
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CELL
PANEL STRING ARRAY
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