BYD Unveils World’s Largest Single-Unit DC Energy Storage System

Published: 23 Sep 2025

Author: Precedence Research

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One of the global leaders in electric mobility and renewable energy, BYD, has unveiled its innovative DC energy storage system. HaoHan, which the company claims is the largest single-unit storage solution in the world, with the largest capacity of 14.5 MWh. It was officially launched on September 18 at the International Digital Energy Expo in Shenzhen, showcasing how BYD was poised to transform the global energy storage industry.

The HaoHan system is able to achieve a minimum unit capacity that is over and above the normal capacity of 6-7 MWh. This is a drastic breakthrough in the utility-scale storage industry. HaoHan provides 10 MWh in a standard 20-foot container and produces a volumetric energy density of 233 kWh per cubic meter, a 51% higher value than the industry average. For a 1 GWh storage facility, HaoHan would reduce the number of required units by over 50%, decrease land usage by one-third, and cut the cell count by 76%. This system is a significant step toward clean energy transition because its improvements can result in reduced project costs, reduced footprint, and reduced deployment times.

The other characteristic of HaoHan that stands out is that it is environmentally conscious. The system features a blockchain-based carbon tracking system that monitors its lifecycle emissions. The carbon effect that BYD indicates is a factor that is becoming crucial as global markets raise their carbon compliance demands, as HaoHan has a carbon impact that is 18% lower than industry averages.

BYD has unveiled a powerful technology development plan that comprises the incorporation of liquid cooling, predictive maintenance software, and hybrid solar-hydrogen-store systems. The aim is to have system efficiency of over 95% by 2026, establishing HaoHan as the standard of the next generation of utility-scale energy storage. Additionally, the other of China, BYD, is looking at going global, especially targeting Europe, Latin America, Africa, and Southeast Asia areas that are actively pursuing advanced storage to help in their renewable energy transition to the mainstream.