Importance

Loading Importance Indicators...

Abstract

A system and methods for measuring the performance of individual strings of photovoltaic (PV) modules in a PV array, including a string combiner box with integrated capability for measurement of string current versus voltage (I-V) characteristics. The system may include calibrated solar insolation reference devices; environmental meters; and/or at least one system computer. The string combiner box allows: high precision string performance measurement during normal power generating operation; isolation of individual strings or groups of strings; and the performance of high-precision full I-V sweeps on individual strings. Methods are provided to analyze measured I-V curves to compensate for the effects of temperature and other variables thereby increasing PV module performance measurement accuracy. Methods are further provided to incorporate data from insolation reference devices and/or environmental meters to extract meaningful parameters from collected data regarding PV module efficiency and degradation, and track string-level performance and degradation over extended periods of time.

Loading the Abstract Image...

First Claim