Installing mobile photovoltaic panels could be used to protect crops, providing both shade and renewable energy. For two years (June to October 2021 and April to August 2022), we studied the effects of alternating periods of full sun and shade on tomatoes by shading the plants at different times of the day (30% less incident radiation than the control). Under shading conditions, the air temperature was slightly reduced without significantly affecting plant phenology. Temporary shading increased stem length, leaf area, and specific leaf area, indicating shade-avoidance syndrome, similar to responses under constant shading. Fruits of shaded plants accumulated less dry mass in 2022, which could be linked to a carbon limitation during the spring of 2022. We discuss the possibility of modulating shading using mobile agrivoltaic systems to optimise the climatic conditions throughout the season for optimal plant and fruit growth.