Solar Module parameters
Modeling a Solar Cell based on the Voltage/Current characteristic. This model is more detailed than the solar cell model and can be used for maximum power point tracking. Although the model requires is more complicated than the solar cell model, it gives more accurate results.
The parameters for the solar module are given in the table below. The model is based on the voltage-current characterisitic and also includes the parasitic circuitry surrounding the solar module.
Compared to the solar cell model, the solar module model can be defined for any nominal operating temperature (Tn) and sunlight density (Enom)
The parameter Factor can be used to enhance the simulation, in almost any case you can leave it to the default value of 10
The parasitic circuitry is defined by the parameters Cparallel, Rparallel, Rseries, Lseries
Specify the open circuit voltage (Uoc), short circuit current (Isc), maximum power point voltage (Umpp) and maximum power point current (Impp) for the nominal Temperature (Tn) and nominal sunlight density (Enom)
The open-circuit voltage temperature coefficient αU specfies the temperature dependence. for the voltage of the characteristic. The short-circuit current temperature coefficient αI specfies the temperature dependence. for the current of the characteristic.
default values are given below for a 150Watt solar module
- Nominal Voltage 24 [V]
- Maximum Power Point MPP 150[W]
- Rated current IMPP 4.4 [A]
- Rated voltage VMPP 34.0 [V]
- Short circuit current ISC 4.8 [A]
- Open circuit voltage VOC 43.4 [V]
| Parameter | Description | Default value |
| Cparallel | Parallel Cell Capacitance | 1nF |
| Enom[W/m2] | Nominal energy density | 1000 |
| Factor[10 .. 100] | Simulation factor, set ot 10, or higher | 10 |
| Impp[A] | Current at maximum power point | 4.4 |
| Isc[A] | Current at short circuit | 4.8 |
| Lseries[H] | Series wire inductance of the connection leads. | 1n |
| Rparallel[Ohm] | Parallel leakage resistance | 100 |
| Rseries[Ohm] | Series wire resistance of the connection leads. | 20m |
| Tn[Celcius | Nominal operation temperature | 25 |
| Umpp[V] | Voltage at maximum power point | 34 |
| Uoc[V] | Voltage at open circuit | 43.4 |
| αI[A/Celcius] | Temperature coefficient for the current | 2.06m |
| αU[V/Celcius] | Temperature coefficient for the voltage | -0.152 |
The inputs on the left side are the sunlight density and the temperature. The terminals on the top and bottom are the electrical terminals. The connection on the right side is for monitoring the internal variables of the solar module and is not used.