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Effect of Hot-Spotted Cell on PV Module Performance

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Document pages: 7 pages

Abstract: In this paper, the effects of the hot-spotted cell on PV module were evaluated. The experimental observation was based on 100 kW PV array composed of 20 PV modules. It was found that an increasing number of hot-spotted solar cells in a PV module would likely increase its output power loss. It was also noticed that most of the PV modules affected by hot-spotted PV string are relatively affected by high-temperature levels, dust, and Partial shading due to trees or tall vegetation. Furthermore, the average performance ratio (PR) and degradation rate (DR) of all examined PV modules were analyzed. PR was observed to have a higher value of 0.78 in a non-hot-spotted PV array, whereas low PR of 0.65 was observed in a hot-spotted PV array. High DR of 3.13 year was observed in hot-spotted PV array; while low DR of 1.48 year was found in a module with no hot-spot. It was evident that the mean PR is significantly reduced due to the existence of hot-spots in the PV modules. DR was also increased due to hot-spot in the PV array. Hence, it is important to select materials that have the highest thermal stability to avoid mild hot spot situations that will lead to immediate damage of the panel. Hot-spot study analysis will help increase PV lifetime power output by detecting and preventing hot spotting before it permanently damages the PV panel.

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