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 the standard. No other units of measurement are included in this practice. 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 and health practices and determine the applicability of regulatory limitations prior to use.
This standard is needed because there is currently no standard that communicates how to calculate expected capacity using a modeled plant. Test Method E2848 is currently used as an acceptance test for photovoltaic plants; however, no standard exists that communicates how to determine an expected capacity value with which the results of Test Method E2848 are compared. test Method E2848 also does not specify how to choose reporting conditions. The choice of reporting conditions can affect measured capacity according to Test method E2848. Photovoltaic plant owners, operators, contractors, and energy off takers will use this to calculate expected capacity with which the capacity measured according to Test Method E2848 will be compared. This will allow a consistent method to determine if expectations set during the development process (this practice) are met by the as built photovoltaic plant (Test Method E2848).
Keywordsperformance; photovoltaics; reporting; systems
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Ballot Item Approved as E2939-2013 and Pending Publication