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PV MODULES: devices that
convert the sun’s energy directly into electricity, they are the main part of a PV system. The modules
can be of two different types: monocristallyne and polycrystalline silicon.
Monocristallyne: the
photovoltaic cells are made of electronic grade silicon with oriented crystals,
the most precious and expensive. Their color is blue-dark, blue uniform. Their
performance to transform sunlight into electricity, it’s the highest and it’s
between 15% and 20%.
Polycrystalline: the
photovoltaic cells are built with silicon crystal not oriented, of average
cost. Their color is blue with highlights. Their performance to transform
sunlight into electricity, it is medium, around 10% and 15%.
How to choose a solar panel?
Basically in a solar panel the most important parameters are the following
ones:
- checking the mechanical integrity and visual
inspection;
-
checking the technical characteristics:
in particular, about the open circuit voltage Voc and Isc current circuit;
- module efficiency: it is an
extremely important parameter as it indicates the capacity to convert the solar
energy into electricity
- cell efficiency: the
efficiency is related to a single cell mounted on the panel which is normally
of greater efficiency than that one of the module.
- tolerance power: it defines
the percentage deviation from the power module from the nominal value stated
(Peak Power). This data is a direct
indicator of
quality equal to the declared maximum power, the module will be
better with a better tolerance.
Not less important is the
congruence of the technical specifications supplied on the label placed on the
back of the panel.
On the label panel find the basic
parameters as follows:
- Peak Power: the highest
power granted by the module;
- Voc: open circuit voltage;
- Isc: short circuit power;
- Vmp: maximum voltage;
- Imp: maximum power;
- Weight:
- Size:
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