BYD has unveiled a new DC energy storage system with the world’s largest single-unit capacity of 14.5 MWh, raising the bar in the rapidly evolving utility-scale storage market. The system, named “HaoHan,” was officially launched on September 18 at the International Digital Energy Expo in Shenzhen.
The company said HaoHan’s minimum unit capacity of 14. 5MWh is more than double the industry norm of 6–7 MWh. When configured within a standard 20-foot container, the system delivers 10 MWh and achieves a volumetric energy density of 233 kWh per cubic meter, a 51% increase on the industry average. For a 1 GWh storage plant, HaoHan would cut the number of required units by more than half, reduce land use by one-third, and trim cell count by 76%, according to the manufacturer.
At the heart of HaoHan is BYD’s self-developed 2,710 Ah Blade Battery cell, which the company claims is the largest energy storage cell in the world. This next-generation cell delivers three times the capacity of conventional storage batteries, boasts a cycle life of over 10,000 cycles, and reduces the total lifecycle cost per kilowatt-hour to below CNY 0.1 ($0.014) – a milestone that could reshape the economics of large-scale storage.
The system achieves a 52% volumetric cell-to-system (VCTS) efficiency, maximizing energy density through integrated cell-to-system design in an approcah which reduces redunat component. Designed for harsh environments from deserts to coastal regions, BYD says HaoHan lowers system failure rates and maintenance costs by 70%. Combined with its in-house power conversion system and energy management software, the unit can provide millisecond-level response and grid-forming capabilities at gigawatt scale.
BYD says HaoHan can cut project-level levelized costs (LCOS) by 21.7%. For a typical 1 GWh installation, total costs related to equipment procurement, transportation, and installation are expected to drop by around 30%. Target applications include grid balancing, renewable energy integration at solar and wind hubs, and backup power for commercial and residential users.
HaoHan also incorporates a blockchain-based carbon tracking system to monitor the product’s lifecycle footprint. BYD claims the system’s carbon impact is 18% lower than the industry average, a feature designed to support compliance with EU carbon border tariffs and other evolving environmental regulations.
The launch of HaoHan comes amid a growing wave of next-generation energy storage systems entering the market. Earlier this year, CATL introduced its 9 MWh TENER Stack, Tesla rolled out its 20 MWh Megablock – a pre-engineered, medium-voltage AC utility-scale solution that combines four Megapack 3 units with an integrated megavolt transformer and switchgear, and Sungrow launched the 6.9 MWh PowerTitan 3.0, optimised for hot climates.
BYD plans to deploy the HaoHan system across multiple gigawatt-scale projects by the end of 2025, including a landmark 12.5 GWh installation in Saudi Arabia. The company is also accelerating its global expansion, targeting key markets in Europe, Latin America, Africa, and Southeast Asia.
Looking ahead, BYD’s technology roadmap includes the integration of liquid cooling, predictive maintenance, and hybrid solar-hydrogen-storage systems. These innovations are aimed at pushing overall system efficiency beyond 95% by 2026, further cementing the company’s position in the next generation of utility-scale energy storage solutions.
In addition, BYD has launched its new GC Flux grid-forming inverter solution, which covers the 2.5–10 MW capacity range.
According to BYD, the inverter boasts a performance level approximately 38% higher than common industry standards and a maximum power density of 1,474 kW/㎡, which is around 130% above typical values in today’s market. The system provides an overload capacity of up to 3x for 10 seconds and reaches a peak efficiency of 99.35%.
Beyond raw performance, the GC Flux PCS features advanced grid-forming capabilities, making it ideal for modern grid applications. It supports active inertia response up to 25 seconds, wide-band damping across 1–1500 Hz, and ultra-fast voltage and frequency regulation in under 100 milliseconds. These functions are critical for ensuring system stability, especially in hybrid or renewable-heavy networks that require seamless transitions between grid-connected and islanded modes.
Complementing the GC Flux PCS and BYD’s high-density HaoHan BESS, the company also introduced its new energy management system: GC Master EMS. Described as the “system brain”, the platform is tailored for intelligent scheduling and control of ultra-large-scale storage projects.
The manufacturer said that GC Master EMS supports integration of up to 10 million data points, roughly 25% above common industry benchmarks. In addition, it offers single-station capacity management of up to 15 GWh, a figure that represents a 400% increase in computing power compared to conventional EMS platforms.