IN Brief:
- LONGi has launched its LONGi ONE full-stack battery energy storage portfolio at Intersolar Europe 2026.
- The platform combines BC solar technology, 5S energy storage, PCS, and OneOS energy management software.
- The portfolio targets utility-scale, C&I, and weak-grid applications as solar-plus-storage moves toward integrated system design.
LONGi has launched its LONGi ONE full-stack battery energy storage portfolio at Intersolar Europe 2026, bringing solar modules, battery storage, power conversion, and energy management software into an integrated European system offer.
The portfolio combines the company’s back-contact solar module technology with its self-developed 5S energy storage system, power conversion systems, and OneOS energy management software. Rather than presenting solar generation and storage as separate procurements, the platform is structured around plant-level and site-level operation.
The utility-scale offer includes OneBank 2.0, an all-in-one AC/DC integrated system with nominal capacity between 6.25MWh and 6.9MWh, and OneMatrix 2.0, a turnkey plant-level solution. The design uses pluggable string PCS units and supports two-hour, four-hour, and eight-hour configurations.
For commercial and industrial users, LONGi has introduced Hi-MO One Pro BESS for self-consumption, electricity price management, and on-site energy optimisation. For off-grid and weak-grid applications, OneNexus provides a microgrid-oriented solution. The control layer uses OneSync PCS and OneOS, described as a cloud-edge energy management platform with virtual power plant functions.
European solar development is increasingly shaped by grid capacity, export limits, negative or low pricing during high-output periods, and curtailment. As those constraints deepen, storage is moving from an optional addition to a core part of project design. A solar plant that can shift energy, manage export, and respond to price signals has a different commercial profile from a generation-only asset.
LONGi’s stated performance figures include 93% round-trip system efficiency for OneBank 2.0 and OneMatrix 2.0, cluster-level management intended to increase lifetime energy output, and reduced deployment timelines. The company has also highlighted safety features including rock wool insulation, predictive cell-risk monitoring, and early-warning functions.
Integrated system design addresses a persistent challenge in solar-plus-storage projects. Multi-vendor delivery can create interface problems between modules, inverters, battery racks, PCS units, plant controllers, SCADA systems, weather forecasting, market dispatch, warranty conditions, and service responsibilities. Those interfaces become more difficult to manage as projects move into higher-value operating strategies.
A solar-plus-storage plant may need to charge from excess generation, respect export limits, avoid curtailment, respond to market prices, deliver ancillary services, and protect battery lifetime. In that environment, the software layer and system controller carry as much operational importance as the nameplate rating of the hardware.
Storage and charging portfolios are also converging at distributed scale. European systems combining storage, EV charging, and energy management show how site-level assets are becoming more software-led and more tightly connected to tariffs, demand limits, and local generation. LONGi’s approach applies a similar integration logic to utility, commercial, and weak-grid solar applications.
Service infrastructure is another important part of the launch. LONGi’s “2830 Plan” includes 30 localised Centres of Excellence across international markets by the end of 2028. The first European centre has opened in Madrid, with further replication planned across the region.
That local service layer is increasingly important for storage projects. Commissioning, firmware updates, warranty handling, spare parts, cyber security, thermal monitoring, diagnostics, and operational optimisation all affect lifetime performance. A storage asset can meet specification at installation and still lose value if control systems, maintenance support, or fault response are weak.
European grid codes are also becoming more demanding as inverter-based resources take a larger share of generation. Inverters, PCS units, and plant controllers are being assessed not only for conversion efficiency but for response to grid disturbance, communications capability, voltage support, and compliance with evolving technical requirements. Grid-forming and grid-supporting functions are becoming part of the wider procurement conversation.
The launch places LONGi in a market where procurement is shifting from component selection toward system outcome. Developers still need modules, batteries, PCS units, transformers, switchgear, and software, but the value of those assets depends on coordinated operation over the project life. Performance guarantees, service reach, safety architecture, and control strategy are becoming part of the same commercial decision.
Europe’s renewable build-out will continue to face grid congestion and market saturation during high-output periods. Integrated solar-storage platforms cannot remove those structural limits on their own, but they can help projects operate more flexibly within them. The LONGi ONE launch reflects a maturing solar market in which storage, controls, and service are now central to how renewable projects are built and operated.
