Modeling of array performance degradation including single-module failure

A model for the performance degradation of a series-parallel array is presented, which includes single-module failure as an independent parameter. The model is checked by using data relevant to two arrays located at the ENEA Casaccia research center near Rome (Italy). By using the model, a first assessing of the influence of single-module failure on array degradation is performed. As a result, it is found that module replacement is not always necessary.