• Dagong ESS

PCS in Energy Storage Systems: Types, Features, Prices, and Selection Guide

What is PCS in ESS?

A Power Conversion System (PCS) is a critical component in energy storage systems (ESS). It serves as the interface between the battery system and the power grid or load, managing the conversion between AC (alternating current) and DC (direct current). PCS ensures bidirectional energy flow, enabling both charging and discharging of the energy storage batteries.

In modern lithium battery ESS, the PCS plays an essential role in energy optimization, grid compliance, frequency regulation, and voltage control. It also integrates with the Battery Management System (BMS) and Energy Management System (EMS) to ensure stable and safe operation.

Types of PCS in ESS

• AC-Coupled PCS

Operates independently from the solar inverterCommon in retrofitting systems or where modularity is needed

• DC-Coupled PCS

Shares DC bus with PV inverterSuitable for new hybrid installations, with higher efficiency

• Centralized PCS

Large capacity, used in container ESS and utility-scale projects

• String PCS

Modular and scalable, often used in C&I energy storage cabinets

Features of PCS in ESS

• Bidirectional Inverter Function: Seamlessly charges and discharges batteries

• Grid-forming or Grid-following Modes: Supports different grid services

• High Efficiency (≥97%): Minimizes energy loss

• Communication Compatibility: Supports protocols like Modbus, CAN, Ethernet

• Safety Protection: Includes over/under-voltage, short-circuit, and islanding protection

• Smart Control: Works with EMS/BMS for optimized dispatching

Applications of PCS in ESS

• Residential ESS: Enables time-of-use optimization and backup power

• Commercial & Industrial ESS: Reduces peak demand charges, increases self-consumption

• Utility-Scale ESS: Provides frequency regulation, voltage support, and spinning reserve

• Microgrids: Balances generation and load in off-grid or hybrid systems

• EV Charging Stations: Supports fast charging and peak shaving when integrated with ESS

Price of PCS in ESS

The price of a PCS depends on multiple factors:

• Rated Power: Ranges from 5kW (residential) to 2.5MW (utility-scale)

• Configuration: AC or DC coupled, hybrid integration, string or central

• Certifications: CE, UL, IEC, etc.

• Customization: Communication protocol, control modes, IP rating

Typical prices range from $200/kW to $350/kW, but exact quotes depend on project specifications, shipping terms (EXW, FOB, CIF), and order volume.

How to Select PCS for Your Project?

When selecting a PCS, consider the following:

• Application Scenario: Residential, commercial, or grid-scale?

• System Size: Ensure compatibility with battery pack and load

• Grid Requirements: Compliance with local standards (e.g., IEEE 1547, EN50549)

• Efficiency and Power Factor: Higher efficiency = better ROI

• Cooling Type: Air-cooled vs. liquid-cooled based on environment

• Smart Features: Remote monitoring, fault detection, AI-based dispatch

Consult with a professional ESS supplier to select the best-fit PCS configuration for your needs.

How Long Does PCS Last?

A high-quality PCS typically has a lifespan of 10 to 15 years, depending on:

• Operating environment

• Maintenance frequency

• Quality of components

• Usage cycles

Proper thermal management and protective design can significantly extend the service life.

The Supplier of PCS in ESS

Dagong ESS is a trusted supplier of integrated energy storage systems equipped with high-performance PCS solutions. Their product line includes:

• Residential ESS with hybrid inverters (5kW to 30kW)

• Commercial & industrial ESS cabinets (100kWh–241kWh)

• Containerized ESS (3.35MWh to 5MWh) with central PCS

• Compatible with global grid standards and communication protocols

Dagong ESS provides customized PCS integration, remote monitoring, and after-sales support to ensure reliable performance and seamless system operation.