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Large scale deployment of PV modules that are reliable with consistent performance will greatly help in their commercialization and in reducing the green house gases that are produced by the emissions from fossil fuels. In this paper, the results obtained during the long-term testing of United Solar triple junction a-Si:H PV modules are presented. During the long term testing the observed performance variation of +1.27% and +0.22% respectively per annum for positive and negative arrays has been determined. Estimated energy yield of 1452 kWhr/kWp/Yr has also been determined. This study indicates that these a-Si:H modules have continued to show good performance without noticeable degradation in the hot and humid climate of Florida.