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Understanding the Demand for Liquid-Cooled C&I Energy Storage in Europe

European commercial and industrial (C&I) electricity users face growing pressure to manage energy costs, comply with grid regulations, and integrate renewable generation reliably. Liquid-cooled battery energy storage systems (BESS) have emerged as a practical solution for peak shaving applications, allowing businesses to shift stored energy into periods of high demand while maintaining thermal stability under heavy cycling. RENAC POWER TECHNOLOGY CO., LTD, operating under the brand Renac Power, has built a C&I ESS product line specifically engineered to meet these requirements across the European market.

Founded in 2017, Renac Power is a technology innovation enterprise specializing in digital energy. The company integrates power electronics, digital control, energy storage, and artificial intelligence through the fusion of 5S technologies to develop safe, reliable, efficient, and intelligent user-side solar-storage products and system solutions. Its stated mission is to bring green energy and power to people in regions with electricity shortages worldwide. With global business coverage, 6+ global offices, and 200+ international certifications, Renac Power has positioned itself to serve C&I customers seeking dependable energy storage infrastructure, including installations already deployed in Romania and the Czech Republic.

The ESS-261: A Liquid-Cooled C&I BESS Built for Flexible Deployment

At the core of Renac Power’s commercial and industrial offering is the ESS-261, a C&I BESS rated at 125 kW and 261 kWh. This all-in-one design uses liquid cooling and is engineered for flexible capacity expansion, allowing businesses to scale storage capacity as their peak shaving needs evolve.

Key technical characteristics of the ESS-261 include:

• Battery technology: LFP LiFePO4 chemistry, configured across 5 battery modules in a 1P52S arrangement
• Voltage specifications: Rated voltage of 832 V, with an operating range of 650-949 V
• Overload capability: Supports 110% long-term overload, which allows the system to accommodate temporary spikes in demand
• PV integration: Efficient PV integration through either DC coupling or AC coupling, supporting hybrid renewable-plus-storage configurations
• Load handling: A 3L/N/PE output with a transformerless design supports 100% unbalanced loads, addressing uneven load distribution common in commercial facilities
• System protection: IP54 system protection with IP55 battery protection
• Power quality: THDi below 3% and THDv below 3%, alongside a system efficiency of 88%
• Maximum charging/discharging current: 200 A

The ESS-261 is backed by a 5-year product warranty and a 10-year battery performance warranty. Remote firmware upgrade and setting capabilities reduce the need for on-site service visits, which is particularly valuable for distributed C&I installations across multiple European sites.

Connectivity and Monitoring

The ESS-261 is delivered as a pre-integrated cabinet with liquid cooling and is equipped with a WEB + APP user interface for straightforward operation and monitoring. Communication options include WiFi, 4G, and Ethernet, with support for both Modbus RTU and Modbus TCP protocols. This connectivity framework allows facility operators to track charge and discharge cycles relevant to peak shaving strategies without requiring constant on-site supervision.

ESS-261-S: Adding Seamless Grid Transition Capability

For C&I sites that require both peak shaving and backup continuity, Renac Power offers the ESS-261-S, which shares the same 125 kW / 261 kWh core specifications as the ESS-261 but integrates a 175 kW static transfer switch (STS) module. This integration enables a switch time of less than 20 milliseconds between on-grid and off-grid modes.

Additional specifications of the ESS-261-S include:

• Maximum AC input power of 175 kW and maximum AC input current of 250 A
• The same 110% long-term overload support and DC/AC coupling flexibility as the ESS-261
• Identical 3L/N/PE transformerless output supporting 100% unbalanced loads
• IP54 system protection with IP55 battery protection
• 5-year product warranty and 10-year battery performance warranty

This configuration is particularly relevant for European commercial operations that need to manage grid interaction points carefully, whether for peak load periods or unplanned grid disturbances.

RENA5000: An Integrated C&I System Approach

Beyond standalone BESS units, Renac Power provides the RENA5000 C&I BESS, an integrated solution that groups the ESS-261, ESS-261-S, the STS-400 micro-grid control system, and the PVS-125 PV controller into a coordinated system. This grouping supports PV, BESS, and diesel generator (DG) coordination, quick installation, and on/off-grid switching. For facilities managing multiple energy sources simultaneously, this integrated approach simplifies the technical complexity of aligning solar generation, battery storage, and grid interaction to reduce reliance on peak-period grid draw.

The STS-400 component within this system supports switching times under 20 milliseconds and coordinates BESS, PV, and DG operation, with a rated ESS AC power of 375 kW and nominal energy of 783 kWh when deployed at full configuration. The PVS-125 PV controller supports up to 187.5 kWp of recommended PV power with 10 MPP trackers, enabling flexible renewable integration alongside the storage system.

Compliance with European Grid Standards

Deploying C&I energy storage in Europe requires adherence to regional grid interconnection standards. The ESS-261 and ESS-261-S are certified to relevant grid regulations including IEC 61727, IEC 62116, EN 50549-1, EN 50549-2, and EN 50549-PL, alongside safety certifications CE-LVD, CE-EMC, and UN38.3. These certifications support deployment across multiple European jurisdictions with varying grid codes, which is a critical consideration for any C&I ESS project intended for peak shaving applications.

Proven Deployment Across European Markets

Renac Power’s C&I ESS products have already been installed at commercial sites in Europe. In Romania, a commercial installation deployed a 125 kW / 261 kWh system using the ESS-261. A similar 125 kW / 261 kWh ESS-261 installation was completed at a commercial site in the Czech Republic. Additional Czech and German commercial installations utilized two RENA1000 units to deliver 100 kW / 208 kWh of combined capacity. These deployments demonstrate the applicability of Renac Power’s liquid-cooled C&I ESS technology within real European commercial contexts.

Conclusion

For European businesses evaluating liquid-cooled C&I energy storage to support peak shaving strategies, Renac Power offers a technically detailed and well-documented product line. The ESS-261 and ESS-261-S provide flexible, high-efficiency storage with strong overload capability and unbalanced load support, while the RENA5000 integrated system extends these capabilities into a coordinated PV, storage, and generator framework. Backed by international certifications aligned with European grid standards and warranty terms covering both product and battery performance, Renac Power’s C&I ESS portfolio reflects the company’s broader positioning as a digital energy technology enterprise focused on safe, reliable, and intelligent user-side solar-storage solutions.

http://www.renacpower.com
Renacpower

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