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2025 Vol.13, Issue 3 Preview Page
Charging and Dis-charging Characteristics of a Self-sustained Power Source Integrated with a Photovoltaic Device and a Secondary Battery

태양전지와 이차전지로 집적한 자가구동형 융합전원의 충전 및 방전 특성 연구

Jeha Kim1*
김 제하1*
1Department of Energy Convergence Engineering, Cheongju University, Eumseong, 27739, Korea
1에너지융합공학과, 청주대학교, 음성, 27739
*Corresponding Author
30 September 2025. pp. 142-147
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Abstract

The growing demand for next-generation renewable energy services highlights the need for self-powered hybrid power technologies that integrate photovoltaic (PV) energy generation with secondary battery (BAT) storage. This study presents the development of a PV-BAT hybrid power source by integrating a 2 (series) × 2 (parallel) PV module composed of four GaInP/GaAs/Ge solar cells and a lithium iron phosphate (LFP) BAT onto a polyimide flexible printed circuit board (PI-FPCB) platform. The PV module exhibited a power conversion efficiency (PCE) of 26.8%, while the LFP BAT had a full-charge voltage of 4.0 V. To ensure efficient charging, the PV module’s charging voltage (Vf) was set below the maximum power voltage (Vm), specifically at ≤ 0.8 VOC. The PV module maintained a stable photocurrent (IPV ≅ 24 mA) within the charging voltage range. The power conversion and storage efficiency (PSE) of the PV-BAT device was calculated to be approximately 22.0%. Outdoor charge–discharge tests revealed that the charging current was significantly influenced by solar movement and fluctuating irradiance conditions, resulting in extended solar charging durations—afternoon charging time increased by more than 40% compared to the midday value of 50 minutes. These findings underscore the importance of matching PV module characteristics with battery specifications to optimize hybrid energy systems for autonomous operation.

Keywords
PV-BAT hybrid power source
GaInP/GaAs/Ge PV module
Lithium iron phosphate secondary battery
Solar charge-discharge
Outdoor testing
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Information
  • Publisher :Korea Photovoltaic Society
  • Publisher(Ko) :한국태양광발전학회
  • Journal Title :Current Photovoltaic Research
  • Volume : 13
  • No :3
  • Pages :142-147
  • Received Date : 2025-08-13
  • Revised Date : 2025-09-11
  • Accepted Date : 2025-09-12
  • DOI :https://doi.org/10.21218/CPR.2025.13.3.142
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