BYD has unveiled “Haohan,” a new DC energy storage system boasting the world’s largest single-unit capacity of 14.5 MWh. The launch took place on September 18 at the International Digital Energy Expo in Shenzhen, underscoring the company’s push to scale utility-grade storage solutions.
The Haohan system more than doubles the current industry benchmark of 6–7 MWh per unit. Within a standard 20-foot container, it can deliver 10 MWh, achieving a volumetric energy density of 233 kWh per cubic meter — 51% higher than the sector average.
BYD said the technology offers major efficiency gains for grid-scale projects. For a 1 GWh installation, Haohan could halve the number of units required, cut land use by a third, and reduce the number of cells by 76%. These improvements translate to lower costs and streamlined operations for developers and utilities.
The system is targeted at renewable energy integration, offering a compact and cost-effective way to stabilize grids and balance intermittent power from solar and wind.
Industry analysts view the launch as a milestone that could intensify competition in the global energy storage market, where demand is rising amid accelerating clean energy deployment.
With Haohan, BYD strengthens its position as a leading player in both electric vehicles and storage technology. The company said the product combines high safety standards, durability, and adaptability across project scales, supporting its broader mission to advance renewable energy adoption worldwide.
