AQ5.1.1 PV Modules
0.0/1.0 point (graded)
Consider a crystalline PV module with the following output parameters mentioned at STC (Standard Test Conditions) conditions by the manufacturer.
Pmax = 300 W
Voc = 40 V
Isc = 8 A
NOCT = 40°C
Temperature coefficient of power = -2 W/°C
If the ambient temperature falls to 15°C while the irradiance is 1000 W/m², what is the cell level temperature in ºC, as per the NOCT model?
To determine the cell level temperature in °C using the NOCT model, you need to take into account the ambient temperature and the temperature coefficient of power.
1. Start by noting the NOCT value provided, which is 40°C.
2. Determine the change in temperature from the NOCT value to the new ambient temperature. In this case, the ambient temperature has fallen to 15°C, so the change in temperature is 40°C - 15°C = 25°C.
3. Use the temperature coefficient of power to calculate the change in power due to the change in temperature. The temperature coefficient of power is given as -2 W/°C, meaning that for every 1°C change in temperature, the power decreases by 2 Watts.
The change in power due to the temperature is therefore: -2 W/°C * 25°C = -50 W.
4. Subtract the change in power from the maximum power output (Pmax) to get the actual power output at the new temperature: Pmax - (-50 W) = 300 W + 50 W = 350 W.
5. Since the temperature coefficient of power accounts for the difference between the NOCT value and the new ambient temperature, the cell level temperature can be assumed to have changed by the same amount as the ambient temperature. Therefore, the cell level temperature at the new ambient temperature of 15°C is 15°C.
So, the cell level temperature in ºC, as per the NOCT model, is 15°C.