UL 4730-2017 pdf free download

UL 4730-2017 pdf free download.Nameplate , Datasheet , and Sampling Requirements of Photovoltaic Modules.
a) Solar simulator maintained to have adequate spatial uniformity, temporal consistency. and spectral accuracy,
b) Reference cells that are maintained at a known, traceable calibration and that are same or similar to the product under test to perform an accurate measurement,
C) Reference modules that are maintained at a known, traceable calibration and that are same or similar to the product under test to perform an accurate measurement,
d) Measurement of module performance to an acceptable standard using the defined reference spectrum of AMI.5 Global Spectrum, and
e) Control of measurement conditions to minimize the need for correction to STC, and correction for any deviations from STC.
7.3 Solar simulators and the methodology used for performance rating shall have an initial estimate of the uncertainty in accordance with 3.1. The uncertainty analysis shall be re-evaluated at least annually. The manufacturer shall develop a control plan for all solar simulators used for performance rating. The control plan should be statistically based using reference modules. The control plan shall have a documented out-of-control action plan for deviations. If multiple solar simulators are used, the control plan shall demonstrate how correlation between the solar simulators is maintained. The manufacturer shall develop a control plan for the measurement procedure that includes verifying control of the module temperature during the scan, placement of the module on the simulator, proper function of the simulator and data acquisition electronics, and verification and maintenance of low-resistance electrical connection to the module. The test temperature of the module should be 25CC ±2°C, and the module should be equilibrated enough that the variation between the cell junction and measurement point on the module Is less than ±1°C. If the test temperature is outside of the recommended range, the deviation from test conditions coupled with the uncertainty in temperature coefficient must not cause the total uncertainty of the measurement to exceed the uncertainty indicated on the datasheet. Solar simulators that have been changed in a way that may affect the performance rating shall be re-qualified for uniformity of irradiance, spectral Irradiance and temporal stability at a minimum of twice per year. Secondary reference modules shall be generated and certified by a recognized certification body for each specific module type. The manufacturer shall develop a control plan for the secondary reference and working reference modules to ensure no significant change occurs that may affect the rating of the module. The organization shall develop a plan to periodically revalidate the correction coefficients for a specific module.
NOTE 1: Solar simulator manufacturer’s procedure, if acceptable to the certification bodies. may be used to validate that the solar simulator meets the uniformity of irradiance, spectral irradiance and temporal stability.
NOTE 2: Multiple secondary reference modules and cells may be needed because they could be damaged or during periods when one secondary reference is out for calibration.UL 4730-2017 pdf free download.