China’s BYD targets next-gen grid storage with massive 14.5 MWh DC system

Chinese company BYD has introduced its Haohan battery system, setting a new standard for grid-scale energy storage with a minimum capacity of 14.5 MWh per unit—more than double the typical 6–7 MWh capacity of most large systems. The battery fits into a standard 20-foot container, delivering 10 MWh at a volumetric energy density of 233 kWh/m³, which is about 51% higher than the market average. Central to the system is BYD’s 2,710 Ah Blade Battery cell, claimed to be the world’s largest for energy storage, offering triple the capacity of typical cells, over 10,000 charge-discharge cycles, and lifetime energy costs below $0.014 per kWh. The design achieves 52% volumetric cell-to-system efficiency by minimizing unnecessary components, resulting in a compact, durable system that reduces failure rates and maintenance costs by approximately 70%. The Haohan system supports millisecond response times and gig