India's Powertrac has ordered a 10 GWh line from China's Sunka Lead in which a pack assembly line and an in-house container shell fabrication line — two upstream flows — merge at a single integrated station. In a two-input line of this kind, the first bottleneck appears not at the pack assembly takt time but at the merge point's synchronization buffer and the AGV transfer capacity linking the two flows. This article, under an assumed scenario (10 GWh/year, 5 MWh container baseline), back-calculates a container takt time of 11,880 s and a pack takt time of 247.5 s, and derives a design value of a minimum 4-unit merge-point buffer (assuming…