1.1 该实践提供了确定特定地理位置的特定光伏系统的预期容量的程序，该特定地理位置在特定时间段内在自然阳光下运行。预期容量旨在与通过试验方法确定的测量容量进行比较 E2848 。 1.2 本规程适用于试验方法 E2848 作为选择适当报告条件（RC）的程序，包括模块平面中的太阳辐照度、环境温度和光伏系统容量测量所需的风速。 1.3 以国际单位制表示的数值应视为标准。本标准中不包括其他计量单位。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ===意义和用途====== 5.1 该实践可用于确定特定位置的现有或拟建光伏系统在指定时间段内的预期容量（参见 数据收集期 在测试方法中 E2848 )。 5.2 根据本规程计算的预期容量可以与根据试验方法测量的容量进行比较 E2848 当RC相同时。 5.3 预期容量和测量容量的比较可以用作工厂验收的标准。 5.4 此做法的用户必须选择性能模拟期，在此期间将得出报告条件和预期容量。 季节性变化可能会导致这两种情况随着性能模拟期的不同而发生变化。 5.5 当本规程与试验方法结合使用时 E2848 ，性能模拟期和数据收集期必须一致。如果他们不同意，那么预期容量和测量容量之间的比较将没有意义。 5.6 历史或测量 5. 阵列平面辐照度、环境空气温度和风速数据可用于选择报告条件并计算预期容量。如果使用历史数据，数据收集期应在季节和长度方面与测量数据的时间段相匹配。 5.7 用于计算预期容量的模拟功率输出应来自一个性能模型，该模型旨在表示光伏系统，该模型将根据测试方法进行报告 E2848 。

1.1 This practice provides procedures for determining the expected capacity of a specific photovoltaic system in a specific geographical location that is in operation under natural sunlight during a specified period of time. The expected capacity is intended for comparison with the measured capacity determined by Test Method E2848 . 1.2 This practice is intended for use with Test Method E2848 as a procedure to select appropriate reporting conditions (RC), including solar irradiance in the plane of the modules, ambient temperature, and wind speed needed for the photovoltaic system capacity measurement. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This practice can be used to determine an expected capacity for an existing or a proposed photovoltaic system in a particular location during a specified period of time (see data collection period in Test Method E2848 ). 5.2 The expected capacity calculated in accordance with this practice can be compared with the capacity measured according to Test Method E2848 when the RC are the same. 5.3 The comparison of expected capacity and measured capacity can be used as a criterion for plant acceptance. 5.4 The user of this practice must select the performance simulation period over which the reporting conditions and expected capacity will be derived. Seasonal variations will likely cause both of these to change with differing performance simulation periods. 5.5 When this practice is used in conjunction with Test Method E2848 , the performance simulation period and the data collection period must agree. If they do not agree, the comparison between expected and measured capacity will not be meaningful. 5.6 Historical or measured 5 plane-of-array irradiance, ambient air temperature, and wind speed data can be used to select reporting conditions and calculate expected capacity. If historical data are used, the data collection period should match the time period of the measured data in terms of season and length. 5.7 The simulated power output that is used to calculate the expected capacity should be derived from a performance model designed to represent the photovoltaic system which will be reported per Test Method E2848 .