Calcabrini et al. explore the potential of low breakdown voltage solar cells to improve the shading tolerance of photovoltaic modules. They show that low breakdown voltage solar cells can significantly improve the electrical performance of partially shaded photovoltaic modules and can limit the temperature increase in reverse-biased solar cells.
The shading tolerance of a PV module can be increased by adding more bypass diodes and using bypass elements with low forward voltages. Addition of one bypass diode per cell can virtually reduce the BDV of solar cells to less than 0.5 V.
Simulation results indicate that, under partial shading conditions, cells with a 0.3-V breakdown voltage could boost by 20% the annual yield of conventional crystal-line silicon PV modules with three bypass diodes.
Over a 4-month-long period, its performance was compared to a reference photovoltaic module with static interconnections and six bypass diodes. The results show that under partial shading, the reconfigurable module produced 10.2% more energy than the reference module.
They show that low breakdown voltage solar cells can significantly improve the electrical performance of partially shaded photovoltaic modules and can limit the temperature increase in reverse-biased solar cells. Calcabrinietal.,CellReportsPhysicalScience3, 101155 December 21, 2022 2022 The Author(s).
These findings are supported by a four-month-long monitoring campaign of PV modules with different breakdown characteristics, which shows a specific yield gain of about 4% in PV modules with six bypass diodes. Over the last two decades, photovoltaic (PV) modules have been massively deployed all over the world.
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