Abstract
Solar photovoltaic (PV) modules submerged underwater can provide useful power to various types of electronic sensors and robotic vehicles, which may be used for scientific research and defense applications. In the present work, outdoor performance evaluation of a 50 W monocrystalline PV module submerged in water is presented. Experiments were conducted in the morning and noontime to study the effect of varying solar irradiance on module power output. At a depth of ~ 0.3 m underwater, the module provided 20.77 W of power, showing a power loss of about 35% in the noontime. Reduction in photocurrent was the dominant factor responsible for the observed power loss. Water also provided cooling to the PV module, and consequently no significant variation in open-circuit voltage was observed. Appreciable values of power were obtained for various water depths and varying solar irradiance values. Spectral response study showed that visible light (400–700 nm) is poorly absorbed, and the infra-red (700–1100 nm) region of the solar spectrum is significantly absorbed by water. Consequently, a substantial drop in photocurrent is observed even at shallow water depths of 5–10 cm. Si solar cells may find practical use in submarine PV applications due to their good visible light response.
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Acknowledgements
The author would like to thank Mr. Arif Khan (Junior Technical Superintendent, IIT Bhilai) and Mr. Pankaj Kumar (Junior Technical Superintendent, IIT Bhilai) for providing logistical help.
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The author acknowledges financial support received through DST-INSPIRE Faculty Award research grant DST/INSPIRE/04/2015/003204, and research initiation grant (RIG) of Indian Institute of Technology Bhilai.
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Chander, N. Underwater Performance Evaluation of Monocrystalline Photovoltaic Module in Outdoor Conditions and Underwater Spectral Response Study of c-Si Solar Cell. Silicon 15, 829–838 (2023). https://doi.org/10.1007/s12633-022-02063-1
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DOI: https://doi.org/10.1007/s12633-022-02063-1