4. 1 PV Module Design, Manufacture, Performance and Reliability
Bifacial PV Modules, Double-Side Illumination, LED, Solar Simulator, Characterisation, Characterization
Summary / Abstract:
The present study is focused on the design and application of simultaneous double-side illumination approach for the characterization of full size commercial silicon bifacial device in order to reproduce the real conditions with both front and rear illumination. The testing procedure is performed by using a prototype high-power Light Emitting Diode (LED)-based rear bias light coupled with a large-area long-pulse solar simulator. The viability of the method to fulfill the IEC TS 60904-1-2 requirements for characterization of bifacial devices is analyzed. “Selfreference” methodology is applied using an accredited reference values (ISO/IEC 17025) obtained by single-side illumination. The proposed approach and prototype LED simulator for large-scale modules have demonstrated good performances in comparison with the single-side one. The current-voltage (I-V) curves and key electrical parameters are very similar, being slightly higher Pmax (±0.3-0.9%), BiFi (±0.5%) and FF (±0.3-0.7%). The rear-side nonuniformity (NU) in the double-side illumination system varies with applied voltage and distances between LEDs and the device, classifying the prototype solar simulator in Class B (>200 W/m2) or C (<100 W/m2) according the applied parameters.