Biophotovoltaic (BPV) system is a developing photo-bio-electrochemical technology that harnesses solar light for power generation. However, a large scale BPV farm is needed for megawatts application, which may not be economically viable as an onshore facility. Therefore, a floating BPV can be an alternative option whereby the spacious offshore area can be utilized; nonetheless, the liquid inside a floating BPV is inevitable to be affected by the ocean wave motions. Hence, the interaction effects of wave motions and power generation of floating BPV device is a crucial decision-making factor to migrate BPV from onshore to offshore area. In this study, a scaled model experiment was conducted to compare the difference in power output between static and floating BPV devices. The findings are expected to provide better understanding on the correlation of these parameters in the implementation of a floating solution for BPV. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021.