EVE Energy on 2025-09-11 unveiled a 5MWh long-cycle energy storage system billed as delivering “five-year zero degradation,” showcased at the RE+ conference in Las Vegas to address project lifecycle costs and exportability for overseas markets.
EVE Energy introduced a 5MWh long-cycle energy storage system — based on its Mr.Giant platform and large-format Mr.Big 628Ah cells — that the company says achieves “five-year zero degradation,” raising the prospect of higher lifetime discharged energy and lower balance-of-system needs for utility and commercial projects.
Company materials state the system increases a single unit’s lifecycle discharged energy by 16% and reduces DC-side equipment count by 16%, which EVE says will cut customers’ initial capital and operating expenses versus conventional designs.
EVE attributes the performance gains to a large-cell strategy and proprietary cell-level innovations: a high-resilience inorganic-rich SEI (solid electrolyte interphase) layer and an SEI targeted-repair technology intended to limit side reactions during transport, storage and cycling, thereby slowing capacity fade. The company also highlighted system-level safety features and full-scene thermal simulation validation.
Alongside the 5MWh system, EVE premiered an 836 kWh split-module cabinet called Mr.Brick designed to ease overseas logistics by breaking large racks into modular pieces to meet road weight limits and simplify transport, a response to export bottlenecks developers cite for megawatt-scale deployments.
Industry coverage and trade press that attended RE+ reported EVE’s announcement and positioned the product within broader market trends: developers are seeking higher-durability storage assets as revenue volatility and increasing merchant exposure push customers to maximize lifetime throughput.
Independent verification data — for example, third-party accelerated calendar and cycle aging reports, UL or TUV certification files, or long-term field trial results — were not published in EVE’s press materials at the time of the launch. Such documentation would be needed to substantiate the “five-year zero degradation” claim to neutral technical and procurement audiences. Data not provided: independent ageing test reports and certification summaries.
EVE said the 5MWh configuration reduces BOS (balance-of-system) complexity by shrinking DC equipment counts, an engineering benefit that can lower installation time and cost, while Mr.Brick aims to cut logistics complexity for overseas projects — both practical responses to developers’ cost and scheduling pressures.
Analysts cautioned that manufacturers’ longevity claims require careful due diligence: supply-chain variability, site thermal regimes, operational depth-of-discharge and charge protocols materially affect real-world degradation. Procurement teams will likely require performance guarantees, field pilots or escrowed warranty structures before committing large portfolios. (Market commentary synthesized from PV-Magazine and PR coverage).
Bottom line: EVE’s 5MWh long-cycle energy storage system and modular Mr.Brick cabinet are aimed at cutting lifecycle costs and easing export logistics; the announcements attracted strong trade attention at RE+, but independent test data and certification documents remain necessary to validate the headline “five-year zero degradation” performance in procurement and regulatory settings.
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