amount of deviation from a straight line function of a performance parameter such as short-circuit electric current or open circuit voltage versus an environmental variable such as irradiance or temperature
NOTE 1 Usually, linearity is expressed as a normalised standard deviation of the line slope
NOTE 2 PV cell, module and system performance evaluations frequently employ linear equations to translate performance from one set of temperature and irradiance conditions to another. Linearity is evaluated by a process in which the best straight-line function is mathematically determined from a set of data points, and then the variation of the data points from this line used in calculations that determines the linearity |