125kW / 261kWh Liquid-Cooled Battery Energy Storage System

Product Overview

The JKESS 125kW / 261kWh Liquid-Cooled Battery Energy Storage System (BESS) is a compact all-in-one outdoor energy storage solution designed for commercial and industrial applications. It integrates high-performance 314Ah LiFePO₄ battery modules, a 125kW Power Conversion System (PCS), intelligent Battery Management System (BMS), Energy Management System (EMS), liquid cooling thermal management, and advanced fire protection into a single outdoor cabinet.

Designed for long-term operation in demanding environments, the system supports grid-tied, off-grid, and hybrid operating modes, making it ideal for renewable energy integration, peak shaving, backup power, EV charging infrastructure, and microgrid projects. The specification describes it as an outdoor modular cabinet integrating the inverter, battery packs, monitoring system, active balancing, and liquid cooling with a rated storage capacity of 261kWh.

Why Choose JKESS 261kWh Liquid-Cooled ESS

The growing demand for distributed energy storage requires systems that are efficient, reliable, and easy to deploy.

The JKESS 261kWh ESS combines all critical subsystems into one factory-integrated solution, significantly reducing installation time while improving overall system efficiency and safety.

Compared with traditional air-cooled systems, the liquid-cooled design delivers superior temperature control, longer battery life, and lower maintenance requirements.

Integrated All-in-One Design

The cabinet integrates every major component required for an energy storage system, including:

• 261kWh LiFePO₄ Battery System

• 125kW PCS

• Intelligent BMS

• EMS Controller

• Liquid Cooling System

• High Voltage Control Box

• Fire Protection System

• Smart Gateway

• Internal Distribution Unit

• HMI Display

The specification lists these integrated components, including the cabinet, liquid cooling, five battery packs, PCS, EMS, high-voltage box, gateway, fire detection, explosion vent, and optional MPPT/STS.

High-Energy Battery Platform

Built with high-quality 314Ah LiFePO₄ prismatic battery cells, the system delivers outstanding energy density and long-term cycling performance.

Battery Configuration:

• Battery Capacity: 261kWh

• Nominal Voltage: 832V DC

• Operating Voltage: 650V–949V

• Rated Charge / Discharge Rate: 0.5C

• Active Balancing Technology

• Five Battery Modules

The main specifications define a 261kWh, 832V battery platform using five 1P52S battery packs with active balancing.

Advanced Liquid Cooling Technology

Temperature consistency is one of the most important factors affecting battery life and system efficiency.

The JKESS ESS adopts an intelligent liquid cooling system that continuously regulates battery temperature under varying operating conditions.

Key advantages include:

• Uniform Cell Temperature Distribution

• Reduced Cell Temperature Difference

• Improved Battery Performance

• Higher Energy Efficiency

• Extended Battery Lifespan

• Stable High-Power Operation

• Lower Auxiliary Energy Consumption

The liquid cooling system uses dedicated cooling plates, pumps, heat exchangers, and coolant to maintain operation from -25°C to +55°C, with a cell temperature difference of ≤3°C.

Intelligent Battery Management System

The integrated BMS continuously monitors every battery module to maximize safety and operational reliability.

Functions include:

• Cell Voltage Monitoring

• Cell Temperature Monitoring

• Current Monitoring

• SOC Estimation

• SOH Evaluation

• Active Cell Balancing

• Fault Diagnosis

• Event Recording

• Alarm Management

• Multi-Level Protection

The specification describes the BMS as a two-layer architecture with master and slave controllers, supporting active balancing, fault protection, event logging, and communication with PCS and EMS.

Intelligent Energy Management System (EMS)

The integrated EMS optimizes energy flow and system performance while providing centralized monitoring.

EMS capabilities include:

• Real-Time System Monitoring

• Energy Scheduling

• Remote Monitoring

• Cloud Connectivity

• Historical Data Logging

• Alarm Notifications

• Remote Configuration

• Power Management

• Multi-System Coordination

The EMS is responsible for data acquisition, monitoring, power control, and safety management within the cabinet.

Multi-Level Safety Protection

Safety is built into every level of the system.

Protection Features:

• Over Voltage Protection

• Under Voltage Protection

• Over Current Protection

• Short Circuit Protection

• Reverse Polarity Protection

• High & Low Temperature Protection

• Insulation Monitoring

• Leakage Protection

• Surge Protection

• Emergency Shutdown

• Intelligent Fault Detection

The specification lists comprehensive AC/DC electrical protections together with BMS protection strategies for voltage, current, temperature, insulation, and leakage.

Intelligent Fire Protection System

The cabinet integrates a comprehensive fire protection solution for maximum operational safety.

Fire protection includes:

• Smoke Detection

• Temperature Detection

• CO Gas Detection

• PACK-Level Fire Suppression

• Aerosol Fire Extinguishing System

• Optional Water Fire Suppression

• Explosion Venting

• Automatic Alarm

• Emergency Protection

The product includes fire detection and explosion venting as standard, with PACK-level Novec (FK-5-1-12) plus compartment aerosol and optional water suppression according to the specification.

High-Efficiency Power Conversion

The integrated 125kW PCS provides reliable bidirectional power conversion between the battery system and the electrical grid.

Features include:

• 125kW Rated Power

• Three-Phase AC Output

• Grid-Tied Operation

• Off-Grid Operation

• Hybrid Operation

• Reactive Power Support

• High Conversion Efficiency

• Low Harmonic Distortion

The topology supports grid-connected and off-grid operation, diesel generator integration, and parallel operation of up to 10 systems.

Smart Communication & Remote Monitoring

The system supports comprehensive communication and remote management.

Communication Interfaces:

• CAN

• RS485

• Ethernet

• Type-C

• WLAN

• APP

• 4G Gateway (Optional)

Users can remotely monitor battery status, system performance, alarms, and operating history through an intelligent cloud platform.

The specification lists LED/LCD/WLAN+APP human-machine interaction together with RS485, Ethernet, CAN, and Type-C interfaces.

Outdoor Industrial Design

Designed for long-term outdoor deployment, the cabinet provides excellent environmental protection.

Features include:

• IP55 Protection Rating

• C4 Anti-Corrosion Coating

• Liquid Cooling

• Outdoor Cabinet Design

• Low Noise Operation

• Wide Temperature Range

• Heavy-Duty Steel Construction

Operating Environment:

• Operating Temperature: -20°C to +55°C

• Storage Temperature: -30°C to +60°C

• Relative Humidity: 5–95% (Non-Condensing)

• Installation Altitude: Up to 4000m (derating above 2000m)

These ratings are provided in the product's environmental specifications.

Flexible Operating Modes

The JKESS 261kWh ESS supports multiple operating strategies to meet different energy requirements.

Supported Modes:

• Grid-Tied Mode

• Off-Grid Mode

• Hybrid Mode

• Peak Shaving

• Load Shifting

• Backup Power

• Self-Consumption Optimization

• Solar + Storage Integration

• UPS Mode

The specification states support for grid-connected, off-grid, UPS, and multiple programmable operating modes.

Typical Applications

Ideal for:

• Commercial & Industrial Energy Storage

• Manufacturing Facilities

• Office Buildings

• Shopping Centers

• Hospitals

• Hotels

• EV Charging Stations

• Solar PV + Storage

• Wind Power Integration

• Microgrids

• Backup Power Systems

• Telecom Infrastructure

• Data Centers

The specification highlights applications including distributed energy, microgrids, emergency power, communication base stations, commercial & industrial storage, and power stations.

Key Features

• 261kWh LiFePO₄ Battery Storage

• 125kW Integrated PCS

• Intelligent Liquid Cooling

• Active Cell Balancing

• Advanced BMS & EMS Integration

• Multi-Level Fire Protection

• Smart Cloud Monitoring

• IP55 Outdoor Cabinet

• Modular Architecture

• Grid-Tied & Off-Grid Operation

• Up to 10 Units in Parallel

• Long Cycle Life

• High Safety & Reliability

Why Professionals Choose JKESS

The JKESS 125kW / 261kWh Liquid-Cooled Battery Energy Storage System delivers a complete, factory-integrated solution for modern commercial and industrial energy storage. Combining high-performance 314Ah LiFePO₄ batteries, intelligent BMS and EMS, active balancing, liquid cooling, advanced fire protection, and a high-efficiency 125kW PCS, it provides exceptional safety, reliability, and energy efficiency. Its modular design, multiple operating modes, and support for parallel expansion up to 10 cabinets make it an ideal platform for scalable C&I ESS, renewable energy integration, microgrids, and backup power applications.

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