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Item type:Publication, Effective DC power rating of PV arrays under challenging operating conditions in desert and tropical regions(Elsevier, 2026)The accurate characterization of photovoltaic (PV) system performance is essential for diagnostics, benchmarking, and O&M. Conventional performance ratio (PR) metrics, standardized in IEC 61724–1, are widely used but remain highly sensitive to irradiance variability, thermal dynamics, and curtailment, often generating false alarms in challenging climates. This study extends a recently proposed statistical method for estimating the effective DC power rating (P₀,eff), the array's nominal power corrected to standard test conditions, by testing multiple irradiance thresholds at two contrasting Peruvian sites: the arid desert of Lima and the tropical rainforest of Chachapoyas. Results show that P₀,eff provides a more stable indicator than PR and PR₍₂₅₎, with uncertainties below 3%. High thresholds (>800 W/m²) yielded the lowest variability (≈1%), while intermediate thresholds (>600 W/m²) balanced stability with greater data coverage. In Lima, the method captured capacity losses from dust deposition, whereas in Chachapoyas it proved robust under persistent cloudiness, where PR fluctuated strongly. A monitoring protocol is proposed in which PR serves as the primary indicator and P₀,eff validates alarms when PR falls below a threshold. This combined approach reduces false alarms while retaining sensitivity to genuine performance losses, offering a practical and climate-resilient tool for PV monitoring and O&M optimization. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Performance loss rate and benchmarking of c-Si and thin-film PV modules considering thermal and spectral effects at a low-latitude site(Elsevier, 2026)Field-based assessment of photovoltaic (PV) module performance provides key insights for accurate lifespan prediction and reliability analysis. However, two significant research gaps remain: the scarcity of long-term evaluations in low-latitude regions and the limited application of established ensemble methods under diverse climatic conditions. This study presents a long-term field performance analysis of eight PV technologies installed in Lima, Peru, a subtropical desert climate at low latitude. Module Performance Ratio (MPR) was evaluated considering the effects of measured temperature and spectral variations. For c-Si-based modules, thermal losses ranged from - 2.7 % to - 4.3 %, while thin-film modules exhibited smaller thermal impacts (- 2.2 % to - 2.6 %). Spectral losses in c-Si modules ranged from - 0.7 % to - 1.5 %. Conversely, a-Si modules recorded spectral gains of 5.7 %. Additional analysis of open-circuit voltage, short-circuit current, and fill factor revealed distinct performance degradation pathways across technologies. Ensemble-derived Performance Loss Rates (PLR), combined with climate-influencing factors, enabled benchmarking and 25-year energy yield projections. Our reported PLRs of up to - 1.61 %/year for c-Si slightly exceed reported global-median PLRs, suggesting detrimental effects of Lima’s high humidity and UV exposure. Projections indicate that in Lima HIT modules may outperform IBC and PERT technologies, underscoring the value of region-specific, long-term PV performance studies.