PV*SOL Expert 6.0 - Manual - Valentin Software

13.2.1 PV Module
Here, on a number of worksheets, you can set the characteristics for the PV modules.
Details on using the database are given under Project Design.
As in all database dialogs, there are the Load, Save and Close buttons and there is also a
Print button.
13.2.1.1 Basic Data:
Manufacturer and Type are allowed a maximum text length of 50 characters.
Output Tolerance [%]
The given module values are subject to fluctuations during manufacture. This is relevant
mainly for the specification of current, voltage and power output.
Cell Type
The majority of cells consist of mono-crystalline or poly-crystalline silicon, with a few
made of amorphous silicon.
New cell types will, however, soon be available.
Dimensions: Height [m], Width [m]
The height and width determine the module surface and therefore the PV array surface
area. This surface area, based on the measurement of the modules, is referred to in the
programme as the Gross Module Surface Area.
13.2.1.2 U/I Characteristics under STC:
The specifications on this page are only valid for standard test conditions (STC). This
means a module temperature of 25°C, a sunlight spectrum of AM 1.5 and 1000 W/m²
irradiation.
MPP Voltage [V], MPP Current [A]
The power output of the modules is dependent on the module temperature and irradiation,
and the module voltage. For each module temperature and irradiation value there is a
current/voltage characteristic curve, and the working point on this curve determines the
modules’ power output.
The MPP is the working point on this curve (see also the U/I characteristic curve button on
the sheet: U/I characteristics - part load) where the power output of the modules is the
greatest (Maximum Power Point).
The MPP voltage and the MPP current are dependent on temperature and irradiation. This
means that the voltage and current given here are only valid for standard test conditions.
For all other irradiation and temperature values there is another MPP. This must be defined
by the programme (see: U/I characteristics - part load).
Within the PV system this task is carried out by the inverter, which regulates the voltage of
the PV generator to maximise current and voltage production (MPP tracking).
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