Performance analysis of vanadium redox flow battery for residential photovoltaic integrated energy storage system

This research investigates the integration of photovoltaic (PV) rooftop systems with vanadium redox flow batteries (VRFB) for residential energy storage applications. Using solar irradiance data from the Bangkok Metropolitan Region and residential load profiles based on energy consumption statistics for Thai households, simulations were conducted using Homer Pro to evaluate system performance and optimize component sizing. The results showed that increasing PV capacity leads to significant surplus energy, which can be effectively stored in VRFB systems. A configuration consisting of a 6 kW PV system and a 35 kWh VRFB achieved an energy storage efficiency of 80.14%, reduced electricity costs by 35% compared to grid-only usage, and lowered annual CO 2 emissions by 4.73 ton CO 2 /year relative to conventional fossil-based systems. Additionally, the system enhanced grid independence by fully eliminating peak demand fluctuations and maintained stable operation under varying solar conditions. These findings offered practical insights for the design of efficient and sustainable PV-VRFB systems in residential settings.