Abstract
Abstract This paper presents the results of the outdoor performance tests for several types of commercial photovoltaic panels. These were both single crystal and multicrystalline silicon (Si) panels as well as thin-film crystalline (CIS) and two amorphous Si devices-single junction, marked as TJ, respectively. The effects of air mass and thus solar time on the performance of the above types of solar cell panels was evaluated for twelve months from year in Baghdad (Latitude 33o) to find the best type of solar panels which suitable with the annual applications according to geographic position of Baghdad. The results of theoretical calculations show that the performance of triple-junction amorphous NIST insulated (TJ-NIST-I) and triple-junction amorphous SNL uninsulated (TJ-SNLUN) are the best type than others at small air mass for eight months from year, while at large air mass the other types give large maximum output power than NIST insulated and SNL uninsulated.
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