1.1This practice is intended to be used with E28484 1.2This practice provides procedures for calculating the expected capacity of a specific photovoltaic system built in a particular place and in operation under natural sunlight during a specified period of time. 1.3In this practice a methodology is provided to select appropriate reporting conditions (RC) including solar irradiance in the plane of the modules, ambient temperature, and wind speed. 1.4This practice assumes that solar cell temperature is directly influenced by ambient temperature and wind speed; if not the regression results may be less meaningful. 1.5The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
This standard is needed because there is currently no standard which communicates how to calculate expected capacity using a modeled plant. E2848 is currently used as an acceptance test for photovoltaic plants; however no standard exists which communicates how to determine an expected capacity value with which the results of E2848 are compared. E2848 also does not specify how to choose reporting conditions. The choice of reporting conditions can affect measured capacity according to E2848. Photovoltaic plant owners, operators, contractors, and energy off takers will use this to calculate expected capacity, with which the capacity measured according to 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 (E2848).
Photovoltaic Non-Concentrating Systems
The title and scope are in draft form and are under development within this ASTM Committee.
Citing ASTM Standards
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