H55 Successfully Completes System Safety Function Verification Testing of Integrated Energy Storage System, Marking a Significant Milestone in the Validation of Its Electric Aviation Technology

In a major breakthrough, H55, a Swiss-based company specializing in certified electric propulsion and energy storage systems for aviation, has successfully completed its System Safety Function Verification Testing, marking a critical step toward certification of its integrated Energy Storage System (ESS). This achievement represents a significant milestone in the validation of H55’s technology, bringing it closer to deployment in the commercial aviation industry.

The successful completion of this testing campaign validates the robust and reliable coordination across all subsystems of its ESS. The test setup included Battery Modules (BMs), Battery Management Units (BMUs), Energy Flow Counter (EFC), Protection and Power Distribution Unit (PPDU), and the Charge Control Unit (CCU). These critical components were brought together in a fully integrated configuration, demonstrating the system’s ability to operate as a cohesive unit.

The testing campaign focused on validating system-level performance, communication integrity, and safety functionality under real operating conditions. The results confirmed that all critical safety functions performed as expected within an integrated architecture, ensuring stable and predictable system behavior across a range of scenarios. A key outcome was the successful verification of critical safety functions at system level, including automatic and controlled disconnection of power under predefined fault or off-nominal conditions—a crucial capability for safe operation in aviation environments.

This milestone represents a significant step in de-risking H55’s software verification and certification roadmap. By validating system-level safety functions in a fully integrated architecture, H55 has demonstrated readiness for certification—not just at component level, but as a complete system. This achievement is particularly noteworthy, given the company’s commitment to aerospace-grade standards and its close collaboration with aviation authorities, including EASA (European Aviation Safety Agency).

H55’s ESS is designed to meet the rigorous safety requirements of the aviation industry, which demands a high level of reliability and predictability in all systems. The company’s approach to safety goes beyond managing failure—focusing instead on detecting, controlling, and mitigating risks before they escalate. This proactive approach enables a higher level of system reliability and is fundamental to achieving certification in demanding aviation environments.

The successful completion of this campaign marks a critical step in bringing H55’s technology from validation to deployment. With active programs underway and growing demand for certified electric propulsion solutions, H55 is well-positioned to support aircraft manufacturers and operators in the transition toward electrified flight. As the aviation industry accelerates toward decarbonization, H55’s integrated and certifiable energy storage systems are enabling a new generation of electric aircraft—designed not just to fly, but to scale.

H55’s technology has been shaped by its rich history in electric aviation, spanning over two decades. The company was founded as the technological legacy of the Solar Impulse program, a pioneering effort that demonstrated the feasibility of electric flight. Since then, H55 has accumulated extensive experience in designing, building, and flying multiple electric aircraft, accumulating more than 2,000 hours of fully electric flight with zero battery-related incidents.

This operational depth provides the foundation for executing certification-grade programs and ensures that H55’s technology meets the highest standards of reliability and safety. The company’s platform-based approach is another key strength in its technology, enabling certification evidence to compound across programs. This reduces adoption risk while facilitating the capital-efficient deployment of electric and hybrid-electric aircraft.

By developing a certified propulsion platform that can be repeated across multiple aircraft programs, H55 is enabling a more efficient transition to electric aviation. The company’s leadership team, comprising experienced professionals with deep expertise in scaling technology companies and hands-on operational execution, supports this approach. Together, they provide a reliable transition from certified design to repeatable series manufacturing.

In summary, H55’s successful completion of System Safety Function Verification Testing marks a significant milestone in its journey toward certification. By validating its integrated Energy Storage System, H55 has demonstrated readiness for deployment in the commercial aviation industry. With its commitment to aerospace-grade standards, close collaboration with aviation authorities, and rich history in electric aviation, H55 is well-positioned to support the growing demand for certified electric propulsion solutions.

As the aviation industry continues to accelerate toward decarbonization, H55’s technology will play a critical role in enabling a new generation of electric aircraft that are designed not just to fly but to scale. With its proven track record and comprehensive validation, H55 is poised to become a leading partner in shaping the future of sustainable aviation.

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