CONTAINER-size energy storage solutions BESS :: 4MWh & 5MWh

We are searching for investors and EPC, following is our offer:

• long-term cooperation at wholesale scale

• flexible payment terms

• training and sharing of best global know-how

• possibility of visiting our reference BESS in EU/Asia

• full technical support during design, construction, O&M

• 15-year-long warranty supported by MunichRE

📍 Questions? - contact us: poland@relyez.com
📍 References: https://relyez.pic-time.com/-intro/gallery

The RelyEZ GridUltra Series is a containerized liquid-cooled energy storage solution designed to deliver high-capacity, high-performance power storage for modern energy applications. Available in 4.18MWh (0.25P) and 5.016MWh (0.5P) configurations, the system is factory-assembled for efficient deployment and reliable operation. Each container is equipped with 10 battery racks in the 4.18MWh model and 12 battery racks in the 5.016MWh model, along with a power distribution cabinet, an advanced liquid-cooling system, and an integrated fire suppression system.

At the core of the GridUltra Series are robust battery racks, each composed of eight modules and fitted with a high-voltage control box to ensure stable and efficient power management. Every battery module contains 52 LFP prismatic cells that undergo strict quality inspections to guarantee high energy density, a wide operating temperature range, and extended service life, while maintaining superior protection and safety standards.

Built on the experience of over a hundred projects and multiple rounds of research and development, GridUltra represents RelyEZ’s most advanced design to date. Its modular, non-walk-in container structure enables faster project delivery while reducing installation and maintenance costs, making it a highly efficient solution for utility-scale and commercial energy storage needs.

The system is engineered for longevity, offering a cycle life of over 8,000 cycles and a design lifespan of up to 15 years. Safety is a defining feature of the GridUltra Series, with liquid-cooled modules protected to IP67 standards, intelligent fire protection design, and multi-point monitoring and warning capabilities. In addition, the system maintains excellent thermal consistency, with cell temperature differences kept below 3°C, ensuring optimal performance, reliability, and long-term operational stability.