Energy in Action | How Ecosolex Supports a More Resilient Solar Energy Future in Romania

Project Overview

Project Location: Romania

Application: Ground-mounted Solar PV + Energy Storage

Completion Date: July 4, 2026

Energy Storage System: Ecosolex M125G261A Liquid-Cooled Integrated Cabinet ESS

System Configuration: 4 × 125kW / 261kWh

Total Capacity: 500kW / 1.044MWh

Architecture: Four cabinets operating in parallel, three-phase four-wire 400V grid-connected system

Project Model: Customer-owned investment, with Ecosolex providing equipment supply, installation and commissioning services, and 10-year O&M support

Reducing Complexity Through Integrated System Design

One of the recurring challenges in solar-plus-storage projects is system integration.

Conventional storage deployment can involve coordination across multiple equipment suppliers and subsystems, increasing the amount of on-site integration, commissioning, and interface management required.

The Ecosolex M125G261A is designed around a factory-preintegrated architecture. Each cabinet integrates a 125kW PCS based on third-generation semiconductor technology, a 261kWh lithium iron phosphate battery system, Ecosolex-developed BMS, intelligent EMS, liquid cooling, fire suppression, and electrical protection systems.

By integrating these core functions before delivery, the solution reduces storage-side integration complexity on site and provides a more unified foundation for future operation and maintenance.

Compactness is another practical consideration. Each M125G261A cabinet occupies approximately 1.35㎡, with a height of 2.25m. For ground-mounted solar plants where land utilization matters, this allows more than 1MWh of storage capacity to be deployed within a relatively small footprint, while reducing the need for large containerized systems and extensive storage-specific civil works.

Designed for Long-Term Outdoor Operation

Energy storage equipment deployed alongside solar plants must operate under changing seasonal and environmental conditions.

The M125G261A is designed for outdoor operation across a temperature range of -20°C to 55°C and features an IP55-rated enclosure for protection against dust, water, and demanding outdoor conditions. The system also supports operation at altitudes above 2,000 meters with appropriate derating.

Its intelligent liquid-cooling system uses an independent closed-loop architecture to help maintain consistent battery temperatures and reduce unnecessary thermal stress.

Safety is built around multiple layers of protection.

The system continuously monitors conditions including short circuit, overcurrent, overvoltage, undervoltage, overtemperature, and insulation abnormalities, enabling millisecond-level circuit interruption when critical faults are detected.

The Ecosolex-developed BMS monitors individual cell voltage and temperature as well as SOC and SOH, while supporting cell balancing across the battery system.

The cabinet also incorporates:

• Three-level fire protection across battery module, battery cluster, and cabinet levels;

• Perfluorohexanone fire suppression for early detection and rapid intervention;

• Dual pressure-relief protection at both battery PACK and cabinet levels;

• Independent liquid-cooled thermal management to support stable battery operating temperatures;

• IP55 outdoor protection for long-term deployment in exposed solar plant environments.

Together, these systems create a layered safety architecture spanning monitoring, prevention, protection, and suppression.

Digital Management Across the System Lifecycle

Long-term energy storage performance depends not only on hardware, but also on how effectively the system can be monitored and managed.

The M125G261A is supported by Ecosolex's digital operation and maintenance capabilities, including cloud-based monitoring, local Web-based operation and maintenance, mobile App access, parameter configuration, alarm management, operational data visibility, and remote software upgrades.

These capabilities give operators greater visibility into system status and provide a more efficient foundation for ongoing asset management throughout the system lifecycle.

From Adding Storage to Building Better Energy Infrastructure

The Romania project reflects a broader transition in the renewable energy market.

As photovoltaic deployment grows, the question is no longer simply how much renewable generation capacity can be installed. Increasingly, project owners must also consider how energy assets can become easier to integrate, more manageable, and more resilient over the long term.

For this project, Ecosolex delivered four factory-integrated M125G261A systems combining battery storage, power conversion, intelligent control, liquid cooling, multi-layer safety protection, and digital operation and maintenance within a compact cabinet architecture.

The value of this approach lies not in a single specification, but in how the complete system is designed to work together—from factory integration and outdoor operation to safety management and lifecycle services.

As energy storage becomes an increasingly important part of renewable infrastructure, long-term value will depend not only on how much energy a system can store, but on how reliably and efficiently it can operate as part of the wider energy system.