20FT Container Energy
Storage System
A fully integrated 20-foot liquid-cooled battery container built on 314Ah LiFePO4 cells — 12 battery clusters, multi-level BMS, fire protection and liquid-cooling thermal management, all pre-installed and factory-tested. Pair it with a central or string PCS up to 2.5MW: drop it on a pad, connect, and run.
Proven Simplicity, Lower Cost
Everything arrives inside one standard 20FT enclosure — no on-site battery assembly, no separate battery room, no surprises.
All-in-One Integration
Battery racks, multi-level BMS, liquid-cooling unit, fire protection and electrical bay pre-installed in a single 20FT container — pre-configured and factory-tested to minimize on-site labor.
Liquid-Cooled Thermal Management
Intelligent liquid cooling keeps cell temperature difference within ±3°C — higher consistency, lower auxiliary power and longer battery life than air-cooled designs.
High-Density 314Ah Cells
The 314Ah LFP platform packs 5.015MWh into a standard 20FT footprint — 35% higher energy density than the previous 280Ah generation, with 8000+ cycle life.
Modular Capacity Expansion
Up to 4 containers per PCS for 2–8 hour applications, and parallel as many blocks as your plant needs — from a single 5MWh unit to gigawatt-hour parks.
Smart Communication
CAN / RS485 / Ethernet battery communication with cell-level monitoring, Modbus RTU/TCP uplink to the EMS and remote O&M platform.
IP55 Outdoor Protection
IP55 container with IP67 battery packs, pack-level fire detection and aerosol suppression — designed for -30°C to +55°C and altitudes up to 4,000m.
Two 20FT Models — 3.44 & 5.015MWh
One liquid-cooled 1500V platform, two cell options: 280Ah for proven economy, 314Ah for maximum density.
| Model | MW-ESS3.44MWH-1500V | MW-ESS5.02MWH-1500V |
|---|---|---|
| Battery Type | Lithium Iron Phosphate (LiFePO4) | |
| Cell Specification | 3.2V / 280Ah | 3.2V / 314Ah |
| Cluster Configuration | 12 × 1P384S | 12 × 1P416S |
| Nominal Capacity | 3440.64 kWh | 5015.96 kWh |
| Nominal Voltage | 1228.8 V | 1331.2 V |
| Battery Voltage Range | 1075.2 ~ 1382.4 V | 1123.2 ~ 1497.6 V |
| Rated Charge/Discharge Rate | 0.5C | |
| Round-Trip Efficiency | ≥ 94% | |
| Cycle Life | ≥ 8000 cycles (@ 70% EOL) | |
| General Data | ||
|---|---|---|
| Cooling Method | Intelligent Liquid Cooling | |
| Ingress Protection | IP55 (Battery Pack IP67) | |
| Fire Protection | Pack-Level Detection + Aerosol Suppression | |
| BMS Communication | CAN / RS485 / Ethernet | |
| EMS Protocol | Modbus RTU / Modbus TCP | |
| Operating Temperature | -30 ~ +55°C | |
| Relative Humidity | 0 ~ 95% Non-condensing | |
| Altitude | ≤ 4,000 m | |
| Dimension L×W×H | 6058 × 2438 × 2896 mm | |
| Weight | About 35,000 kg | ≤ 42,000 kg |
| PCS Matching | ||
|---|---|---|
| PCS Type | Central / String PCS (external or MV skid) | |
| PCS Power | Up to 1.72 MW (0.5C) | Up to 2.5 MW (0.5C) |
| DC Input Voltage | 1500 V Platform | |
| Standards | ||
|---|---|---|
| Battery Standards | IEC 62619 / IEC 63056 / UL 1973 / UL 9540A / UN 38.3 | |
| Installation Standard | NFPA 855 | |
Specifications subject to change without notice.
What’s Inside the 20FT
- 1Battery Cabins12 liquid-cooled clusters of 314Ah LFP packs behind full-length access doors.
- 2Electrical & Control BayDC combiner, cluster control boxes with BCMU, and local monitoring.
- 3Liquid-Cooling UnitIntegrated chiller circulates coolant through cold plates under every pack.
- 4Fire ProtectionPack-level smoke/heat detection with aerosol suppression and venting design.
Where the 20FT Delivers
C&I Energy Storage
Peak shaving and solar self-consumption for factories, business parks and commercial buildings.
Rural Power Shortage
Stable power for villages and towns where the grid is weak, distant or unreliable.
Off-Grid Island
Diesel-replacement microgrids with black start and multi-machine parallel operation.
Nomadic Farm
Movable power for irrigation, cold storage and processing in remote agricultural sites.
Mine Off-Grid
Rugged containerized power for mining camps and quarry operations beyond the grid.
Proven in the Field
20FT container installations from West Africa to Southeast Asia — video and photo records from real project sites.
Lagos 1MW Solar Microgrid Project
A 20FT container with 1MW PCS and 1MWh LFP storage powers a commercial facility in Lagos, replacing diesel generation with solar-plus-storage through daily grid outages.
Mombasa 5MWh Container Delivery & Installation
Crane lift and positioning of a 20FT 5MWh liquid-cooled container at an industrial site in Mombasa — from truck to energized in a single working day.
Factory Acceptance Test Before Shipment
Every container ships only after a full factory acceptance test — racks, BMS, PCS and cooling verified under load before loading.
Baghdad Container Site Installation
A 20FT liquid-cooled container set on a concrete pad outside Baghdad, pre-commissioned on site by Marwell engineers before final grid connection.
Davao Twin-Container Commissioning
Two 20FT containers commissioned side by side for a food-processing plant, with open-door access making final checks fast and safe.
Surabaya Island-Grid Storage Project
A 20FT container paired with rooftop solar and string inverters stabilizes an industrial estate’s weak island grid in East Java.
Standards & Certifications
Download the Catalog
Get the full Marwell Solar C&I BESS Catalog 2026 with the complete 20FT container specifications, or send us your project requirements — our engineers will reply within 24 hours.