In large-scale energy storage systems, the high voltage box (HV box) and the power conversion system (PCS) work as an integrated pair.

The HV box collects and distributes high-voltage DC from multiple battery clusters, ensuring protection and safety.

The PCS then converts this DC into AC for grid or load use, and vice versa for charging.

Together, they form the electrical backbone of the system, enabling smooth bidirectional energy flow between the battery modules and the grid.

Types of Configurations

• Different configurations reflect how HV boxes and PCS interact:

• Modular Systems – In 100kWh or 241kWh air-cooled systems, compact HV boxes coordinate with PCS units rated at 30–50kW.

• Liquid-Cooled Systems – In 215kWh or 372kWh designs, advanced HV boxes integrate with PCS to handle higher current density and thermal performance.

• Containerized Systems – Multi-megawatt setups like 3.35MWh or 5MWh ESS containers combine large HV distribution cabinets with high-capacity PCS units for utility-scale grid services.

Features of HV Box and PCS Cooperation

• Voltage Matching – The HV box stabilizes DC voltage levels, ensuring PCS operates within its designed range.

• Fault Protection – HV box safety devices isolate faults before they reach PCS, protecting power electronics.

• Efficient Conversion – PCS leverages the stable input from HV box to deliver high-efficiency AC output.

• System Monitoring – Both units share real-time data with the EMS, enhancing operational transparency.

• Grid Compliance – Cooperation ensures compliance with standards such as CE and IEC for international projects.

Applications in Energy Storage Systems

The collaboration of HV box and PCS plays a role in:

• C&I Projects – 100kWh–372kWh systems for peak shaving, frequency regulation, and backup power.

• Renewable Integration – solar or wind energy combined with large battery banks, where HV box ensures safety and PCS manages grid exchange.

• Utility-Scale Deployments – containerized systems such as 3.35MWh and 5MWh ESS that support ancillary services like voltage regulation and black start capability.

Price of HV Box and PCS in ESS

The cost of energy storage systems for renewable energy integration depends on several factors, including system capacity, storage duration, battery type, control software, installation conditions, and auxiliary equipment.
Pricing is usually quoted under international trade terms such as EXW, FOB, or CIF, depending on project location and logistics preferences.
For a tailored quotation based on your specific project needs, it's best to consult directly with the supplier.

How to Select the Right HV Box and PCS Combination?

When planning a project, consider:

• System Capacity – smaller 100kWh systems vs. multi-MWh containers.

• Cooling Method – air-cooled vs. liquid-cooled design affecting component durability.

• Grid Requirements – PCS output rating, grid code compliance, and harmonic control.

• Redundancy and Safety – ensuring HV box has sufficient isolation and PCS has backup protection.

How Long Do HV Box and PCS Last?

• High Voltage Box – typically 10–15 years with proper maintenance.

• PCS – usually 8–12 years, depending on usage cycles and cooling efficiency.
  When properly integrated, both components can be synchronized to match the 15-year design life of containerized ESS projects.

The Supplier of HV Box and PCS in ESS

Reliable suppliers integrate both HV boxes and PCS within turnkey systems, ensuring compatibility and safety. For example, solutions ranging from 100kWh air-cooled units to 5MWh containerized ESS are delivered with harmonized HV distribution and PCS modules, ready for global deployment.