Relyez launches 5 MWh battery for two-hour energy storage

China-based energy storage system provider Relyez has launched a 5 MWh battery for utility-scale and commercial & industrial (C&I) applications.

“This modular, non-walk-in container is designed for rapid deployment, minimizing both installation and maintenance costs,” the company’s CEO, Naomi Zhang, told ESS News.

The GridUltra 5016 is a two-hour energy storage system with a 5.016 MWh capacity. It consists of 12 RelyEZ Battery Racks connected in parallel, integrating a battery management system (BMS), liquid-cooling system, fire suppression system, and environmental control system.

Each rack comprises 52 battery packs connected in series, along with a high-voltage control box. Each battery pack contains 52 lithium iron phosphate (LFP) 314 Ah cells with a voltage of 3.2 V arranged in series. “These provide high energy density, wide operating temperature range, long lifespan, lightweight construction, and enhanced safety,” Zhang added.

The battery also includes liquid cooling plates, aluminum serial bars, end plates, an outer shell, a current collection system, and a slave battery module unit.

The system has a size of 6,058 mm x 2,438 mm x 2,896 and its weight ranges from 38,000 kg and 42,000 kg. It operates within temperatures ranging from -30 C to 50 C and supports elevations up to 3,000 meters.

The battery reportedly has a lifecycle of more than 8,000 cycles. It relies on liquid cooling and is IP67-rated. Its roundtrip efficiency at begin of life (BOL) is 88%, according to the manufacturer.

The system was already deployed in several large-scale storage projects in China, including a 300 MW/600 MWh storage demonstration project in Yunnan Province. “This project also stands out as the first of its kind to be integrated with a 500KVA transmission substation, setting a new industry standard,” Zhang stated.

Relyez is a Bloomberg Tier 1 manufacturer and S&P Global Top 10 Original Battery Energy Storage System provider.