Measurement NOCT of PV Module Using Several Methods According to the IEC61215

International Standard IEC 61215 is very important in testing the quality of  photovoltaic (PV), and one of the most important tests is of nominal operating cell temperature (NOCT) in the part (Crystalline silicon terrestrial photovotaic modules – Design qualification and type approval), So we can see in the operating mode part in the point C ; Reject ambient temperatures outside the range 20°C ± 15°C or varying by more than 5°C from the maximum value to the minimum value recorded during the recording of a data set, This condition can change with changes in the region and climate differences and this condition forces us to extract three methods for calculating NOCT the first method reject ambient temperatures outside the range (min T) + 5°C, the second method reject ambient temperatures outside the range (max T) - 5°C and the third method reject ambient temperatures outside the range (between min T and max T is 5°C). In this paper we calculating the NOCT of two different technology of PV modules (glass to glass (PV1) and backsheet to glass(PV2)) by this three methods according to the standard IEC 61215 and conclude which is better.