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LONGi unveiled its expanded battery energy storage and microgrid portfolio for commercial and industrial (C&I) customers in Eastern Europe at an event in Greece on 24 September 2026, attended by customers and partners from the solar and energy sector. The portfolio consists of three solutions: Hi-MO One MONA for integrated C&I storage, Hi-MO One Pro for long-duration storage of up to 24 hours, and OneNexus H2 for microgrid management.
Hi-MO One MONA offers integrated storage for energy shifting, peak load management and greater use of on-site solar generation, and several units can run in parallel when more capacity is needed. Hi-MO One Pro allows power and energy capacity to be configured independently. OneNexus H2 combines battery storage with microgrid control, coordinating solar generation, grid supply, batteries and generators in grid-connected and off-grid operation.
Grid constraints and curtailment drive demand for storage
According to the company, the launch comes at a time when renewable installations in Eastern Europe are advancing faster than parts of the region’s power infrastructure can handle. Grid constraints limit the integration of additional renewable generation, and periods of surplus solar lead to curtailment and very low or negative electricity prices. The rise in variable generation increases the need for balancing, while security of supply and energy resilience remain important issues in parts of the region.
Jia Chao, President of Distributed Generation Europe at LONGi, said Europe has made significant progress in adding renewable generation and that the next phase will depend on how effectively this electricity can be integrated and used. Chao stressed that as electricity markets become more volatile, storage helps businesses preserve the value of their solar investments and gives customers more control over when they use electricity.
Two architectures on the Hi-MO ONE platform
Both storage systems are based on LONGi’s Hi-MO ONE platform developed for C&I customers. The platform combines battery storage with power conversion, battery management, energy management and thermal management technologies developed by LONGi. Its Intelligent Cell Control System (iCCS) monitors battery behaviour at cell level to detect emerging anomalies and enable predictive risk detection.
Hi-MO One MONA combines 125 kW of rated output power with 261 kWh of storage capacity in a liquid-cooled LFP system. Its all-in-one architecture brings together battery storage, power conversion, battery management, energy management and thermal management in each unit. The system can operate grid-connected and off-grid. Typical applications include factories that charge batteries during cheap hours and use them during expensive production hours, commercial buildings seeking to cut peak demand, and businesses that want to use more of the electricity produced by rooftop or on-site solar.
Hi-MO One Pro is designed for applications where power and energy capacity need to be configured independently. The system separates 261 kWh DC battery cabinets from AC power equipment available in 125 kW and 250 kW options. In a 1+11 configuration, one AC unit can be combined with up to 11 DC battery cabinets, delivering storage durations of 2 to 24 hours. This makes it particularly suited to businesses that want to shift a larger share of daytime solar generation to evening and night operations.
Solar, battery, grid and generator in one system with OneNexus H2
Available in configurations from 50 to 125 kW and 104 to 261 kWh, OneNexus H2 combines battery storage with a hybrid PCS and energy management system and can coordinate solar generation, batteries, the grid and generators. Its microgrid architecture switches between grid-connected and off-grid operation within 10 milliseconds and offers black-start capability, allowing a site to be re-energised without an external grid.
The system’s Utility Grid Boost function supports the existing connection with battery power when site demand exceeds grid connection capacity. At remote sites, running solar, battery storage and a generator together aims to cut generator running hours and fuel consumption.
Adrian Kočan, General Manager of Distributed Generation Eastern Europe at LONGi, said the business case for storage depends on the site, the load profile, the available grid capacity and the role of solar in energy supply, that storage architecture should follow the business case, and that LONGi has taken this approach with its Eastern Europe portfolio.
Growing need for flexibility across the region
The press release notes that Greece is seeing more periods of curtailment and very low or negative electricity prices. It says Slovakia is taking system flexibility into account when connecting additional solar and wind capacity, Moldova is developing additional balancing capacity and Hungary’s high solar share is increasing the need for flexibility, while Poland, Czechia and Bulgaria are expanding storage and flexibility measures. North Macedonia has integrated storage into its energy market framework, and in Ukraine the resilience of the power system and security of supply remain priorities.
Source: LONGi press release, “LONGi launches integrated energy storage and microgrid portfolio in Eastern Europe”, 24 September 2026.
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