What are the Normal Operating Cell Temperature (NMOT ex NOCT) values for Dualsun Panels?
The photovoltaic characteristics of Dualsun panels at nominal working temperature (NMOT values) are available on every datasheet of our product: Tecnnical documents.
Those data are determined following to steps:
Measure of the nominal working temperature (NMOT)
This is done in an outside environment by an independent laboratory according to the following conditions:
Solar irradiation of 800 W/m2
Wind of 1m/s of wind
Outside temperature of 20°C
Air mass coefficient of 1.5
The air mass coefficient depends on the thickness of the atmosphere through which the sun's rays pass. It is used to estimate the solar radiation spectrum at a given location.
The result of this measurement is a temperature, depending on the cell technology and the structure of the laminate, and usually located in the interval [40°C, 45°C]. The NMOT is more representative of the temperature at which the panels operate than the STC conditions for which the temperature required to measure the power of the modules is 25°C.
Determination of the I-V Curve at NMOT
During this step, the panel is checked under NMOT condition in order to determine its I-V curve:
Solar irradiation = 800W/m²
Temperature = temperature calculated during step 1
Air mass coefficient of 1.5
During this stage the same panel performance are measured as in STC:
Nominal power (Pmpp)
Voltage at maximum power (Vmpp)
Current at maximum power (Impp)
Open circuit voltage (Vco)
Short-circuit intensity (Isc)
Learn more on Dualsun panels photovoltaic performances : What is the LID and LeTID that would degrade the photovoltaic yield on Dualsun panels?
