Consider a crystalline PV module with the following output parameters mentioned at STC (Standard Test Conditions) conditions by the manufacturer.
Pmax = 250 W
Voc = 50 V
Isc = 6 A
NOCT = 40°C
Temperature coefficient of power = -1 W/°C
If the ambient temperature falls to 0°C while the irradiance is 1000 W/m², what is the cell level temperature in °C, as per the NOCT model?
To calculate the cell level temperature, we can use the NOCT model equation:
Tc = Ta + ((NOCT - 20) / 80) * (Irradiance - 800)
Where:
Tc is the cell temperature in °C,
Ta is the ambient temperature in °C,
NOCT is the nominal operating cell temperature in °C,
Irradiance is the actual irradiance in W/m².
Let's plug in the values given in the question:
Ta = 0°C (ambient temperature)
NOCT = 40°C
Irradiance = 1000 W/m²
Using the formula:
Tc = 0 + ((40 - 20) / 80) * (1000 - 800)
Tc = 0 + (20 / 80) * 200
Tc = 0 + 0.25 * 200
Tc = 0 + 50
Tc = 50°C
Therefore, the cell level temperature in °C, as per the NOCT model, would be 50°C.