Main parameters affecting solar cell modules
a) Parameters under STC standard test conditions: the existing main nominal data are all based on STC conditions, namely
1. Ground 2. Light intensity 1000W/m2 3. Air quality AM1.5 4. Temperature 25°C (battery temperature)
b) Normal working parameters of NOCT components: the parameters under the conditions of 800W/m2, AM1.5, wind speed 1m/s, and ambient temperature 20°C are mainly used as an important reference value for customers, because in actual situations, under this condition The parameters are closer to reality.
c) Voc open circuit voltage: the voltage value of the component under no load condition, the maximum voltage in this case
d) Isc short-circuit current: the current of the component after no load is applied and the positive and negative poles are directly connected. In this case, the current is the largest
e) Vmpp maximum peak voltage: the voltage value at the maximum output power (maximum power point)
f) Impp maximum peak current: current value at maximum output power
g) Temperature coefficient Temperature coefficient:
Some properties of materials will change with temperature. The so-called temperature coefficient refers to the rate at which the physical properties of materials change with temperature.
For components, this parameter is used to characterize the current, voltage, and power of the component as it changes with temperature. Currently, we only have the temperature coefficients of the three values of open-circuit voltage, short-circuit current, and peak power in our specifications. Among them, only short-circuit current and temperature are positively correlated. Voltage and power are negatively correlated, which means that the short-circuit current will increase as the temperature increases, and the voltage and power will decrease as the temperature increases. Therefore, when designing the maximum number of modules in series, temperature is a factor that must be considered.