Comsys control technology powers second-life battery system in Borås

Comsys AB announced the successful installation of a containerized, grid-connected second-life battery system in Borås, Sweden, using its control software and hardware to integrate repurposed EV batteries delivered by Rebaba and assembled with El och Marinteknik. The system operates responsively in real time—able to supply or absorb energy and maintain the 50 Hz frequency balance—demonstrating that reused car batteries can meet reliability and stability requirements for the Nordic grid. Comsys says the project proves a fully Swedish, scalable battery energy storage solution can be built without original carmaker involvement, extending battery life, reducing waste and potentially creating new commercial opportunities for BESS integrators and grid operators in the region.

Analysis

Comsys AB announced the successful installation of a containerized second-life battery system in Borås, Sweden, with Comsys control software and hardware at its core; the system was delivered by Rebaba and integrated by El och Marinteknik using repurposed electric vehicle batteries. The installation is grid-connected and designed to operate in real time to either supply or absorb energy while maintaining the 50 Hz frequency balance required by the Nordic grid, demonstrating functional stability and responsiveness for second-life assets.

The company highlights that the project is fully Swedish and scalable and explicitly notes it was built "without the involvement of the original car manufacturer," signaling a potential open value chain for BESS integrators using reused cells. That technical validation addresses two investor-relevant points: operational suitability for ancillary services and a pathway to extend battery life while lowering material waste.

Strategic implications include potential new commercial opportunities for BESS integrators, grid operators and circular energy providers in the Nordics, and an ESG/cost angle from extended asset life. Key risks remain unquantified in the release: long-term performance and degradation of second-life packs, economic competitiveness versus new batteries, standardization and regulatory acceptance at scale.

Key Decisions for Investors

• Monitor follow-on commercial deployments and contract wins from Comsys, Rebaba, or El och Marinteknik as proof points before increasing exposure
• Evaluate selective exposure to Nordic BESS integrators or circular-energy providers that can scale second-life solutions, but limit position size until clear unit economics and lifecycle data emerge
• Watch regulatory developments and frequency/ancillary service pricing in the Nordic market because revenue visibility for grid services will materially affect project economics
• Consider hedging or staged investments tied to operational KPIs (availability, degradation rates, service revenue) rather than assuming broad market adoption