5. 3 Operation, Performance and Maintenance of PV Systems
Bifacial, PV Array, Performance, Non-Uniform, Irradiance, Rear Side
Summary / Abstract:
The bifacial crystalline silicon (Si) photovoltaic (PV) module market has grown significantly in recent years thanks to their increased performance in comparison to conventional monofacial PV modules. Nonetheless, due to the multiple variables that influence the performance of such devices, their characterization lacks consistency. In particular, when it comes to bifacial systems operating under real operating conditions there are voids to be filled in order to guarantee meaningful characterization for the long-term energy yield assessment. This can be achieved by the analysis of field data for different technologies, rack configurations and climates [1, 2]. Based on previous work on single bifacial modules this work extends the analysis of the behaviour of the rear-side irradiance of outdoor bifacial test arrays and their energy yield during one year. The rear irradiance non-uniformity (NU) analysis is crucial for long-term degradation rate and bifacial gain predictions (and hence bankability) in medium and large utility-scale solar systems with high-efficiency bifacial modules.