PV*SOL Expert 6.0 - Manual - Valentin Software

PV*SOL Expert 6.0 - Manual
No-Load Voltage [V]
The voltage that arises when the module is load free. This value is also dependent on
temperature and irradiation.
Short Circuit Current [A]
The electricity that flows through a short circuited module. This is also temperature and
irradiation dependent.
Specified Power Output [W]
The power output that the module produces under standard test conditions according to
the manufacturer’s data sheets. The actual power output is defined from the module
voltage and the module current, and is given in the Calculated Power Output field. In
defining the installed PV power output, PV*SOL ® always refers to the calculated power
output.
Efficiency [%]
The module efficiency rate under standard test conditions. For the simulation, the
programme determines the Solar Module Surface Area from the calculated power output
and efficiency with the following formula:
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Nominal output(STC) = 1000 W/m² * ETA(STC) * Solar module surface area
13.2.1.3 U/I Characteristics under Part Load Conditions:
Current and Voltage for a second working level are entered on this page. The values for a
lower level of irradiation are important in order to be able to calculate the module
efficiency curve. The efficiency specifications in data sheets are based on a module
temperature of 25°C and irradiation of 1000 W/m², although for most of the year these
levels are seldom reached. The efficiency rate at a lower level of irradiation is therefore
very important for the simulation results. There are a number of important points to
consider when determining the second working point (Module Efficiency - Part Load). Click
on the Help button to view these. The programme will calculate the second working point
for you if you click on the Typical Part Load Efficiency button.
You can view a graph of the characteristic curve calculated by the programme by clicking
on the Efficiency Curve, U-I Curve or U-P Curve buttons.
13.2.1.4 Other Characteristics:
Temperature Coefficients:
Voltage Coefficient [mV/K]
This value expresses how many degrees the voltage decreases when there is a rise in
module temperature. The hotter the module, the lower the voltage, i.e. this coefficient is
negative.