Chinese energy storage manufacturer and BNEF Tier 1 supplier offering C&I and utility-scale BESS. Full-stack self-developed systems including BMS, EMS, and cloud platform.
CE
📍 Shenzhen, China
Est. 2012
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CATL-ATL joint venture specializing in residential, C&I, and data center energy storage. Uses proprietary Kunlun LFP cells with 15,000-cycle lifespan and pioneered mass-produced semi-solid-state LFP cells with 32 GWh annual production capacity.
ISO 9001ISO 14001
📍 Xiamen, China
Est. 2021
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#2 global battery manufacturer with vertically integrated BESS from Blade LFP cells to DC and AC block systems. Haohan is the flagship utility-scale DC block up to 14.6 MWh; Chess Plus covers C&I applications.
ISO 9001ISO 14001ISO 45001
📍 Shenzhen, China
Est. 1995
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Chinese Tier 1 LFP cell manufacturer listed on the Hong Kong Stock Exchange. Produces high-capacity LFP cells and containerized BESS for utility-scale energy storage with 100 GWh annual capacity.
ISO 9001ISO 14001ISO 45001
📍 Changzhou, China
Est. 2007
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World's largest BESS battery manufacturer by shipped capacity. Vertically integrated from LFP cell production to containerized DC block systems. Flagship TENER platform claims zero degradation over first five years.
ISO 9001ISO 14001ISO 45001
📍 Ningde, China
Est. 2011
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CATL-invested energy storage company offering LFP cells, containerized BESS, and C&I storage systems with liquid cooling and DC bus architecture.
📍 Fujian, China
Est. 2019
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Chinese state-owned rolling stock and energy group, ranked #3 globally in BESS integration by market share. Offers liquid-cooled containerized energy storage systems.
📍 Beijing, China
Est. 2015
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Canadian-Chinese solar and energy storage company with dedicated e-STORAGE subsidiary. Manufactures own LFP cells and utility-scale SolBank DC block systems.
📍 Guelph, Canada
Est. 2001
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Subsidiary of Hengxin Auto Group, ranked top 7 globally in ESS battery shipments. LFP cells (100–588Ah) and DC blocks up to 6.26 MWh. Datasheets available.
IATF 16949ISO 9001
📍 Xiaogan, China
Est. 2021
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Tier 1 battery manufacturer operating the world's largest dedicated BESS factory (60 GWh in Jingmen). Produces LFP cells (628Ah 'Mr. Big') and containerized DC block systems with CTP technology. Also developing sodium-ion BESS.
ISO 9001ISO 14001ISO 45001
📍 Huizhou, China
Est. 2001
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Top 4 global BESS integrator (Wood Mackenzie) and BloombergNEF Tier 1 manufacturer with 30+ GWh deployed across 300+ projects. Gen 8 Scalable Platform features proprietary 750Ah+ LFP cells in modular 10-foot units supporting 6-12+ MWh configurations with 440+ Wh/L energy density.
ISO 9001ISO 14001ISO 45001
📍 Shanghai, China
Est. 2007
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Sino-British clean energy company ranked 2nd globally for residential energy storage shipments and BloombergNEF Tier 1. Offers hybrid inverters, high-voltage LFP battery systems, and C&I all-in-one storage solutions across 70+ countries.
ISO 9001ISO 14001
📍 Wenzhou, China
Est. 2019
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Chinese lithium mining and battery group with vertically integrated BESS division. Over 21 GWh deployed globally, offering LFP cells and containerized energy storage systems up to 10 MWh.
📍 Xinyu, China
Est. 2000
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Liquid-cooled DC and AC block ESS from 261 kWh to 5 MWh for C&I and utility-scale applications. Datasheets, company presentation, and reference case.
📍 Shenzhen, China
Est. 2021
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Volkswagen-backed Chinese battery manufacturer developing next-generation LMFP cells alongside LFP. Expanding into Europe and North America with GWh-scale BESS projects.
ISO 9001ISO 14001ISO 45001
📍 Hefei, China
Est. 2006
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Chinese battery manufacturer listed on the Shenzhen Stock Exchange (300438) with 8 production bases and capacity exceeding 100 GWh. Produces LFP cells and utility-scale BESS systems.
📍 Guangzhou, China
Est. 2001
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Fast-growing LFP cell and DC block manufacturer. Vertically integrated from ∞Cell (280–1,300Ah) to ∞Block/∞Power containerized systems up to 6.9 MWh. 50 GWh capacity, 10 GWh US plant. Datasheets available.
ISO 9001ISO 14001ISO 45001
+1 more
📍 Xiamen, China
Est. 2019
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Chinese energy storage manufacturer and BNEF Tier 1 supplier, ranked among China's top 3 C&I storage providers. Full-stack self-developed systems with 3S integration.
CE
📍 China
Est. 2005
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Smart String ESS with LUNA2000 DC blocks from 2 to 4.5 MWh, PCS up to 213 kW, and SPPC2000 plant controller. Datasheets and reports available.
ISO 9001ISO 14001ISO 45001
+1 more
📍 Shenzhen, China
Est. 2021
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BNEF Tier 1 BESS integrator with 45+ GWh deployed. DC and AC blocks from 233 kWh to 12.8 MWh. Product datasheets and specs available.
ISO 9001ISO 14001ISO 45001
📍 Beijing, China
Est. 2009
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Energy storage division of JinkoSolar and BNEF Tier 1 manufacturer, offering utility-scale and C&I battery energy storage systems built on in-house LFP cell technology. SunTera containers deliver up to 6.25 MWh per 20ft unit with 10,000+ cycle life.
ISO 9001ISO 14001ISO 45001
📍 Shanghai, China
Est. 2022
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World's 4th largest PCS supplier (S&P Global). Manufactures energy storage PCS, MV skids, and DC block systems from 500 kW to 10 MW. Listed on SZSE (002335) — annual report and datasheets available.
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+1 more
📍 Xiamen, China
Est. 1988
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Chinese smart grid and energy storage company listed on the Shanghai Stock Exchange. Offers liquid-cooled battery containers, energy storage cabinets, and integrated EMS platforms.
📍 Qidong, China
Est. 1995
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Chinese state-backed battery cell manufacturer and one of the earliest companies in China to enter energy storage (since 2010). Produces LFP and NMC prismatic cells and 5 MWh liquid-cooled containerized BESS with 31 GWh annual production capacity.
ISO 9001ISO 14001
📍 Tianjin, China
Est. 1997
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Swiss-headquartered energy storage company manufacturing LFP-based BESS solutions in Turkey. Product range spans utility-scale DC containers and MV skids to commercial AC cabinets.
📍 Zurich, Switzerland
Est. 2024
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Vertically integrated energy storage company manufacturing LFP cells (280Ah to 783Ah solid-state) and containerized BESS up to 8.3 MWh per unit. Over 8 GWh installed globally across 40+ countries with 260+ safety certifications and pioneering solid-state battery technology.
ISO 9001ISO 14001ISO 45001
📍 Hangzhou, China
Est. 1994
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US-based BESS company (Mitsubishi Power and EES joint venture) offering integrated energy storage platforms. Over 6 GWh deployed across 35+ utility-scale projects.
📍 Lake Mary, USA
Est. 2024
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Leading modular LFP battery system manufacturer for C&I and utility-scale BESS. Container-based L-series and PowerCube rack systems are deployed across European and APAC markets.
ISO 9001ISO 14001ISO 45001
📍 Shanghai, China
Est. 2009
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Chinese energy storage company specializing in modular BESS solutions from 50 kWh to 5+ MWh with intelligent microgrid control systems. Core technology centers on smart microgrid controllers with millisecond-level response, integrated EMS, and cloud-based virtual power plant capabilities.
ISO 9001ISO 14001
📍 Guangzhou, China
Est. 2016
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BloombergNEF Tier 1 energy storage manufacturer that expanded from solar into comprehensive BESS solutions through subsidiary SYL Battery. Offers vertically integrated products spanning LFP cells, modules, PCS, and containerized systems with 15 GWh+ annual production capacity.
ISO 9001ISO 14001ISO 45001
📍 Ningbo, China
Est. 1986
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French battery manufacturer and TotalEnergies subsidiary specializing in high-reliability BESS for industrial and grid applications. Intensium Max+ is their flagship utility-scale BESS container.
ISO 9001ISO 14001ISO 45001
📍 Paris, France
Est. 1918
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Korean Tier 1 battery cell manufacturer and supplier producing NCA cells for utility-scale BESS. SBB (Samsung Battery Box) DC blocks deliver up to 5.259 MWh per 20ft container with liquid cooling.
ISO 9001ISO 14001ISO 45001
📍 Suwon, South Korea
Est. 1970
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BNEF Tier 1 ESS manufacturer. DC blocks from 835 kWh to 5 MWh and AC blocks. Company presentation, ESG report, and datasheets available.
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+2 more
📍 Shanghai, China
Est. 2017
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Fast-growing energy storage company founded by former Huawei Smart PV executives, specializing in AI-optimized residential and C&I BESS. SigenStor 5-in-one system integrates solar inverter, EV DC charger, battery PCS, battery pack, and EMS in a single unit.
UL 9540UL 1973IEC 62619
📍 Shanghai, China
Est. 2022
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Chinese publicly listed smart energy company specializing in PV inverters and energy storage systems. Manufactures utility-scale PCS and battery containers (ORI series) as well as commercial and industrial integrated storage solutions.
ISO 14001
📍 Hangzhou, China
Est. 2012
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BloombergNEF Tier 1 energy storage manufacturer with vertically integrated LFP cell production (102Ah to 684Ah) and containerized BESS systems. NoahX 3.0 delivers 6.528 MWh per 20ft container with 15,000+ cycle life and AI-based active balancing.
ISO 9001ISO 14001ISO 45001
📍 Shenzhen, China
Est. 1997
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Trina Solar's energy storage division offering vertically integrated BESS with in-house LFP cells. BNEF Tier 1 with over 20 GWh shipped globally.
📍 Changzhou, China
Est. 1997
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Chinese cable and energy group offering utility-scale liquid-cooled BESS containers with self-developed integrated PCS. Active in energy storage since 2012.
📍 Nantong, China
Est. 1992
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Chinese BESS manufacturer specializing in PCS, battery packs, BMS, and complete energy storage systems. Top 10 Chinese utility-scale BESS OEM supplier with 100+ large-scale projects installed globally.
TUVUL
📍 Guangzhou, China
Est. 1999
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Overview
What is a DC Block?
A DC block is a pre-assembled containerized unit that packages battery modules, a battery management system (BMS), thermal management (liquid or air cooling), and fire suppression into a single enclosure. DC blocks output DC power and must be paired with an external power conversion system (PCS) to connect to the AC grid.
DC blocks are the most common building block for utility-scale BESS projects (50 MW and above). Because the PCS is separate, project developers can mix and match DC blocks from one manufacturer with a PCS from another, giving more flexibility in system design, procurement, and maintenance.
Key Specifications
What to compare when evaluating DC blocks
When shortlisting DC block suppliers for a BESS project, these are the key technical specifications EPCs, developers, and investors typically evaluate:
C-Rate
0.25C – 1C
1h, 2h, or 4h duration — determines power-to-energy ratio
Energy Capacity
4 – 9+ MWh
Per container, depends on cell density and configuration
Chemistry
LFP dominant
Some manufacturers also offer NMC or sodium-ion variants
Round-Trip Efficiency
85 – 95%
DC-side; AC RTE depends on PCS losses
Cooling Method
Liquid or Air
Liquid cooling is increasingly standard for utility-scale
Certifications
UL 9540A, IEC 62619
UL 9540A for fire safety, IEC 62619 for battery safety, UN 38.3 for transport
FAQ
Frequently Asked Questions
What is the difference between a DC block and an AC block?
A DC block contains only the battery system (cells, BMS, thermal management, fire suppression) and outputs DC power. An AC block integrates the PCS (inverter) inside the same enclosure, outputting grid-ready AC power. DC blocks offer more flexibility in system design since the PCS is selected and sized independently.
Why do most utility-scale BESS projects use DC blocks?
DC blocks allow developers to decouple battery procurement from PCS procurement. This gives flexibility to choose best-in-class suppliers for each component, negotiate separately, and replace or augment batteries independently of the inverter over the project's lifetime. It also simplifies thermal management since the PCS generates its own heat.
What certifications should a DC block have?
For bankability, most lenders and insurers require UL 9540A (fire safety testing for energy storage), IEC 62619 (battery safety), and UN 38.3 (transport safety). Regional requirements vary — European projects typically require CE marking, while North American projects need UL listing. Additional certifications like IEC 62477 and NFPA 855 compliance are increasingly expected.
How does DC block capacity affect project cost?
Higher-capacity DC blocks (6+ MWh per container) reduce the number of containers needed for a given project size, which lowers balance-of-plant costs (foundations, cabling, land). However, higher energy density may require more sophisticated thermal management. The trend is toward denser blocks as cell-level energy density improves.