PVPS部件和系统可靠性工程旨在定义PVPS做出指示值（如能源或收入）的概率，也在给定的统计置信水平下进行估算。这需要进行适当的评估，因为在最广泛的实际现场条件下，根据实际电厂的实际测量数据，确定一组可量化指标，并根据这些指标采取行动，从而产生准确的平准化能源成本（LCOE）。在许多情况下，P数（代表“百分位”）的使用可能不被清楚地理解，因此，得出的结论不恰当，会产生财务后果。P值用于确定所需的置信度，以确保项目符合规范。例如，P50值表示可靠性预测中使用的值有50%的置信度。这个置信值转化为人口的中位数，或者换句话说，它相当于掷硬币决定这个值是否有效。 最好有更高的信心，该系统将工作规范。对于可靠性指标，这通常被定义为P90或P95值。这种信心水平在很大程度上决定了工厂可用性的财务和技术风险。购买本文件时可获得的所有当前修订均包含在购买本文件中。

PVPS component and system reliability engineering works to define the PVPS probability of making the indicated value such as energy or revenue, also at a given statistical confidence level for an estimate. This needs to be assessed properly as an accurate levelized cost of energy (LCOE) results from identifying and acting on a set of quantifiable metrics based upon real measured data of actual plants under the widest variety of real site conditions. In many instances, the use of P numbers (which stands for "percentile") may not be clearly understood and as a result, inappropriate conclusions drawn which have a financial result. P values are used to establish the confidence that one can require to provide the assurance that the item will meet specification. A P50 value, for example, provides that there is a 50 % confidence in the value used in reliability predictions. This value of confidence translates to the median of the population or in other words, it is equivalent to a coin toss on whether the value is valid. It is better to have a higher confidence that the system will work to specification. For reliability metrics, this is typically defined as being a P90 or P95 values. This level of confidence significantly characterizes financial and technical risk plant availability.All current amendments available at time of purchase are included with the purchase of this document.