Verification of uncertainty in CPV’s outdoor performance

Multi-junction cells have high efficiency but their performance ratio was less than the conventional single junction cell. One of the issues is lower outdoor performance in the outdoor operation conditions due to spectrum mismatch influenced by fluctuation of sun-height and atmospheric parameters. In this study, to predict the energy yield at an arbitrary point, firstly, we estimated the range of atmospheric parameter fluctuation that determines the spectrum from Bird's spectrum model using the DNI spectrum measured at University of Miyazaki. Furthermore, we examined the uncertainty of the outdoor performance of CPV system using the DNI spectrum resynthesized from the Monte Carlo method. As a result, when considering the atmospheric parameters, calculated values approached to the measured values and the uncertainty of outdoor performance was confirmed.