UNCERTAINTIES OF LABORATORY MEASUREMENTS FOR ENERGY RATING

摘要

Laboratory measurement of irradiance and temperature behaviour of PV modules are widely used topredict energy produced by PV modules or systems. The inherent measurement uncertainties have so far not been anessential part of the discussion. In this contribution, we investigate how the uncertainty of laboratory characterizationpropagates to rated energy on an exemplary basis. For three typical modules (c-Si, CdTe, CIS) and three locations, theirradiance and temperature losses were simulated. The input data used for the simulation were module characteristics asmeasured and modified according to the possible influence of measurement uncertainties. Statistical uncertainties as wellas systematic uncorrected offsets were considered. The resulting uncertainty for expected real world losses is dependenton the location. For irradiance, it is roughly ±1.0 for c-Si, ±1.5% for the CIS module under investigation, and ±2.5% forCdTe. Uncertainty of temperature losses was ±0.1% for the locations with low temperature and ±0.4% for highertemperatures for all technologies. The values apply, if measurement uncertainties are minimized. As a consequence ofthese results, thorough PV module energy rating or PV system yield prediction is possible only with reliable laboratorymeasurements.