In the recent years every country adopting renewable energy technologies to dimmish the climate change and environment sustainability. Energy storge system became integral part of renewable energy utilization as they are highly intermittent. Among many energy storage systems, flow batteries are very promising at grid level. The other advantage is the independent scalability of power and energy. Most of the flow batteries are prone to cross contamination but on the other hand vanadium redox flow batteries (VRFB) are exceptional as they have vanadium ions on both positive and negative electrolyte. Conventional flow batteries have thick graphite plates where channels are grooved for uniform distribution and cell pressure drop reduction which are essential in industrial scale flow batteries. But thick graphite plates are permeable to electrolyte and prone to sweating (leads to leakage). Thin graphite sheet (0.6 mm) as an alternative used in the present studies which serves as separator and bipolar sheets. Two frame cell concept is proposed in which carbon felts are placed in the cavity of the frame and sandwiched between membrane and thin graphite sheet. Electrolyte is forced to circulate directly through the felt and it’s called as flow-through mode. Pressure drop in such a designs are relatively high when compared with conventional channelled flow batteries. Many parameters such as current density, electrolyte circulation rate and state of charge (SOC) plays and important role in the performance of the cell. The present studies focus on optimizing the parameters to reduce the pressure drop and increase electrochemical performance of the industrial scale flow-through mode VRFB.