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ATESS 20ft liquid-cooled ESS containers integrate PACK, EMS, BMS, HVAC, and fire safety into a single all-in-one cabinet — delivering up to 5.015 MWh in a standard 20ft footprint with cell temperature difference kept within 3°C.
Liquid Cooling
Liquid cooling provides a higher heat transfer coefficient than air cooling, removing heat more quickly and efficiently. The variable-frequency compressor adjusts operating status based on real-time temperature, reducing auxiliary power consumption. Compared to air cooling, liquid cooling reduces battery cell temperature difference by 200%, keeping the spread within 3°C across all cells — extending battery service life and enhancing safety throughout the system lifetime.
5.015MWh in 20ft
The 20HCL5MJ model packs 5,015 kWh (416s12p configuration) into a single 20ft container (6,058 × 2,438 × 2,896 mm), achieving the highest energy density in its class and lowering the cost per kWh. The 20HCL4MJ model offers 3,993 kWh (416s10p) in the same footprint. Both models operate at a nominal voltage of 1,331.2V with a 1,164.8–1,497.6V operating range, compatible with utility-scale PCS systems.
IP55 / PACK IP65
The container achieves IP55 protection with individual battery PACKs rated IP65, combined with C4 anti-corrosion treatment for deployment in coastal, industrial, and harsh outdoor environments. The system operates across a wide ambient temperature range of −30°C to +55°C for both charge and discharge, making it suitable for power generation side, grid side, and C&I ESS applications worldwide.
6,000 Cycles
Rated for 6,000 charge-discharge cycles at 0.5C and 25°C, the liquid-cooled thermal management system ensures uniform cell temperatures that directly translate to longer calendar life and reduced degradation. System efficiency reaches 95.2% at 0.25P and 93.8% at 0.5P. CAN, RS485, and TCP/IP communication interfaces enable seamless integration with SCADA, EMS, and cloud monitoring platforms.
Side-by-side specifications for both 20ft liquid-cooled ESS container models.
| Parameter | 20HCL4MJ (3.993MWh) | 20HCL5MJ (5.015MWh) |
|---|---|---|
| Battery System | ||
| Configuration | 416s10p | 416s12p |
| Rated Energy | 3,993 kWh | 5,015 kWh |
| Rated Voltage | 1,331.2 V | |
| Operating Voltage Range | 1,164.8 – 1,497.6 V | |
| Rated Charge/Discharge Rate | 0.5C | |
| Cycle Life | 6,000 @ (0.5P, 25°C) | |
| Efficiency | 93.8% @ 0.5P | 95.2% @ 0.25P | |
| Thermal Management | ||
| Cooling / Heating Type | Liquid cooling / heating | |
| Refrigerating Power | 40 kW | 60 kW |
| Heating Power | 15 kW | 24 kW |
| Auxiliary Power @ 35°C ambient | 24 kW | 27 kW |
| Auxiliary Power @ 45°C ambient | 30 kW | 33.5 kW |
| Physical & Environmental | ||
| Dimensions (L × W × H) | 6,058 × 2,438 × 2,896 mm | |
| Weight | 36,500 kg | 42,500 kg |
| Container IP Level | IP55 | |
| PACK IP Level | IP65 | |
| Anti-Corrosion Level | C4 | |
| Operating Temp (Charge & Discharge) | −30°C ~ +55°C | |
| Communication & Certifications | ||
| Communication | CAN, RS485, TCP/IP | |
| Certifications | IEC 62619 / UL 9540A / UL 1973 / UN 38.3 / NFPA 68 / IEEE 693 / IEC 62933 / EN 61000-6-2/4 / EN 62477-1 | |
| Shenzhen Atess Power Technology Co., Ltd | Distributed by Aurea Energy | ||
PACK, EMS, BMS, HVAC, and fire safety are factory-integrated and tested — arriving site-ready for rapid commissioning.
Our engineering team is available Mon – Fri 8:00am – 6:00pm CST. Emergency support 24/7.
