BESS PCS Container
PCS topology: Centralized & String
Rated power: 3450 kW – 6900 kVA
DC voltage: up to 1500V DC
MV output: 10kV – 35kV
Max. efficiency: up to 98%
Installation: Containerized or skid-based
Power Conversion and Step-up for BESS Grid Connection
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Power Conversion and Step-up in One Unit
Polinovel PCS containers combine DC/AC power conversion and step-up transformer integration in one containerized system, helping battery energy storage projects connect to medium-voltage grids with fewer separate electrical units and less on-site matching work.
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Protected Design for Reliable Outdoor Operation
Built for demanding energy storage sites, the PCS container integrates electrical protection, cooling design, and outdoor-ready enclosure protection to support stable operation under changing site conditions and high-power conversion loads.
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String and Centralized PCS Options
Polinovel provides both string and centralized PCS container solutions. String PCS design supports more flexible battery-side management, while centralized PCS design offers compact integration and efficient deployment for large-scale BESS plants.
Explore Our PCS Container Solutions
Polinovel supplies both centralized and string BESS PCS container configurations. Every unit pairs directly with our containerized BESS and connects the battery side to the medium-voltage grid through an integrated step-up transformer and MV switchgear.
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![PCS & Transformer Integrated Container]()
PCS & Transformer Integrated ContainerThe PCS & Transformer Integrated Container is a high-power centralized power block designed for utility-scale BESS plants. It combines PCS conversion and step-up transformer functionality into aread more -
![Integrated PCS & Step-Up Transformer For BESS]()
Integrated PCS & Step-Up Transformer For BESSIntegrated PCS & Step-Up Transformer for BESS is a centralized PCS-transformer unit designed to build a compact power block between battery containers and the medium-voltage grid.●Centralized PCS andread more -
![PCS Turnkey Station With MV Transformer]()
PCS Turnkey Station With MV TransformerThe PCS Turnkey Station with MV Transformer is a project-ready MV PCS station for large-scale energy storage plants, combining string PCS, transformer connection, protection, communication, andread more -
![PCS-Boost Container]()
PCS-Boost ContainerThe PCS-Boost Container is a string PCS boost solution built for BESS projects that require cluster-level battery management, voltage step-up, and reliable grid support in one integrated electricalread more
Compare PCS Container Configurations
Compare the four Polinovel PCS container configurations by topology, rated power,
medium-voltage output, grid-support functions and best-fit application.
| Parameter | PCS & Transformer Integrated Container | Integrated PCS & Step-Up Transformer | PCS Turnkey Station With MV Transformer | PCS-Boost Container |
|---|---|---|---|---|
| PCS topology | Centralized | Centralized | String | String |
| Rated power | 3450–4000 kW | 6900 kVA | 6250 kVA | 4300–5000 kW |
| Max. DC voltage | 1500V | 1500V | 1500V | 1500V |
| Battery voltage range | 1000–1500V | 1000–1500V | 1000–1500V | 1000–1500V |
| Battery groups / clusters | 2 | 2 / 4 | 8 / 16 | 20 / 24 |
| MV output voltage | 10–35kV | 10–35kV | 10–35kV | 10–35kV |
| Grid frequency | 50/60Hz | 50/60Hz | 50/60Hz | 50/60Hz |
| Step-up transformer | Dry / oil-immersed | Dry / oil-immersed | Dry / oil-immersed | Dry / oil-immersed |
| Max. system efficiency | 98% | 98% | 98% | 98% |
| Cooling | Air cooling | Forced air cooling | Liquid cooling | Air cooling |
| Protection (converter) | IP65 | IP65 | IP66 | IP66 |
| Grid support | PQ, PF -1~+1 | PQ / VF / SVG / VSG, ride-through, black start | IEC61850, VSG, black start, freq. regulation | VSG, black start, primary freq. regulation |
| Operating temperature | -40~+60℃ | -40~+60℃ | -40~+60℃ | -40~+60℃ |
| Weight | 14.5–15 t | 30 t | 30 t | 15–18 t |
| Best-fit application | Standardized utility-scale power block | Compact centralized power block | Turnkey MV power station | Cluster-level, phased / mixed batteries |
What Is a BESS PCS Container?
A BESS PCS container sits between the battery containers and the medium-voltage grid. Its core job is bidirectional DC/AC conversion: it turns battery DC into grid-compliant AC when discharging, and AC back into DC when charging. On top of the power conversion stage, a PCS container can integrate a step-up transformer, MV switchgear, protection, a cooling system and communication, so the whole medium-voltage interface ships as one containerized unit. This is what separates a PCS container from a plain battery container, which only stores energy and outputs DC.
The way the PCS container connects to the rest of the plant follows a clear system architecture, and the choice between DC-coupled and AC-coupled layouts affects where conversion happens:
Battery Container (DC)
↓ DC
Bidirectional PCS — DC/AC power conversion
↓ LV AC
Step-Up Transformer — voltage step-up
↓ MV AC
MV Switchgear / RMU — grid connection & protection
↓
Utility Grid
EMS / PPC / SCADA ↔ PCS Control System
Plant-level dispatch is handled by the energy management system, which coordinates the PCS control layer for grid connection, charge/discharge scheduling and grid support.
Centralized PCS vs String PCS for BESS
Both centralized and string PCS container designs are available.
The right topology depends on how granular your battery management needs to be and how you weigh compactness against fault isolation.
| Dimension | Centralized PCS | String PCS |
|---|---|---|
| Power conversion | Central conversion for many clusters | Grouped / modular conversion |
| Battery management | Centralized across battery clusters | Finer cluster-level management |
| Power density | More compact, standardized | More modular |
| Fault isolation | Relies on system-level redundancy | Single-module faults contained |
| Maintenance | Fewer units to service | Flexible module replacement |
| Best fit | Standardized utility-scale power blocks | Modular, independently managed projects |
Integrated Power Conversion and MV Grid Connection
Fewer Electrical Interfaces
Integrating the PCS, step-up transformer, MV switchgear and protection into one PCS container reduces separate electrical units and the equipment matching work between them.
Faster On-Site Deployment
Pre-integration, pre-wiring and factory testing shorten on-site cabling, commissioning and integration for the medium-voltage power block.
Flexible Power Block Design
Centralized and string PCS container options match different battery blocks, DC voltage windows and MV grid levels across utility-scale and C&I projects.
Outdoor and Grid-Ready
Enclosure protection, an engineered cooling system and electrical protection support stable operation under changing site conditions and high-power conversion loads.
Applications
Polinovel PCS container and MV power station solutions are deployed across the main grid-connected energy storage scenarios:
Utility-Scale Battery Storage
Centralized PCS power blocks connect large utility-scale storage plants to the medium-voltage grid, pairing with multi-MWh containerized battery storage.
Solar-Plus-Storage & Wind
PCS containers smooth renewable output and shift energy, buffering solar and wind generation before it reaches the grid.
Grid Frequency Regulation
Fast bidirectional conversion supports frequency regulation and grid stability with responsive charge/discharge control.
Large C&I Microgrids
String PCS containers suit commercial and industrial microgrids that need modular, cluster-level battery management.
How to Select the Right PCS Container
Confirming the following project data helps size the correct BESS PCS container and speeds up your configuration:
Confirm plant power in MW and storage capacity in MWh.
Confirm the battery DC voltage range and the number of battery containers.
Select centralized or string PCS topology.
Confirm LV AC and required MV output voltage (10kV–35kV).
Confirm grid-forming or grid-following requirements.
Confirm climate, altitude and applicable grid standards.
Understanding the full set of energy storage system components and why utility-scale storage is scaling helps frame these choices for larger projects.
Engineering Support for BESS Power Blocks
Polinovel supports PCS container projects with PCS sizing, transformer matching, MV switchgear configuration, single-line diagram support, protection coordination, battery compatibility review, container layout design and factory acceptance testing. Quality checks such as full-load, insulation, protection, communication and thermal testing are carried out before delivery, and units can be built toward standards such as UL certification where the project requires it.
Technical Downloads
Datasheets, system architecture drawings, single-line diagram samples and container layouts for each PCS container are available in the technical downloads library. Project-specific configuration files can be shared after a short requirement review.
Frequently Asked Questions
Q: What is a PCS container in a BESS?
A: A PCS container is a containerized power conversion system between the battery containers and the medium-voltage grid. It performs bidirectional DC/AC conversion and can integrate a step-up transformer, MV switchgear, protection, cooling and communication into one power block.
Q: Does a PCS container include a transformer?
A: Yes. Polinovel BESS PCS containers integrate a step-up transformer to raise the PCS low-voltage AC output to medium voltage for grid connection. Transformer type, capacity and MV output are configured per project.
Q: What is the difference between a PCS container and a battery container?
A: A battery container stores energy and outputs DC; a PCS container converts that DC to grid AC, steps it up to medium voltage and manages grid connection. They are complementary units in the same plant.
Q: What is the difference between centralized and string PCS?
A: A centralized PCS converts power for many battery clusters together for a compact, standardized power block. A string PCS uses modular units for finer cluster-level management and localized fault isolation.
Q: Can the MV output voltage be customized?
A: Yes. The medium-voltage output covers a 10kV to 35kV range and is configured to the local grid code and project, using a dry-type or oil-immersed step-up transformer.
Q: How should PCS power be matched with battery capacity?
A: PCS rated power is selected against the plant power target, the battery energy capacity and C-rate, the DC voltage window, the number of battery containers and the required grid-forming or grid-following functions.
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