Sinexcel Secures German Grid Certification for StellaON
The StellaON power conversion system is now cleared for use in large-scale German battery storage projects.
Updated on Oct. 22, 2026 in Energy
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Sinexcel has received TÜV SÜD unit certification for its StellaON 1250K/1575K power conversion systems, confirming compliance with German VDE-AR-N standards. This approval clears the technology for implementation in utility-scale battery storage projects across Germany.
Why it matters
Obtaining this certification is a critical step for Sinexcel to expand its European footprint and integrate its high-capacity storage solutions into regional power grids. The system is designed to maintain performance standards while meeting strict grid reliability requirements.
The StellaON 1250K/1575K systems achieve 98.5% efficiency at full load and maintain rated output at ambient temperatures up to 55°C. The units are also capable of delivering 1.5 times their rated power for a duration of 60 seconds.
The players
Sinexcel
This China-based company specializes in power electronics and has a total installed storage capacity of 17 GW.
TÜV SÜD
This international certification organization provides technical inspection and testing services for industrial equipment.
The details
The certification process involved rigorous assessment of converter behavior during grid faults, power control, and frequency responses. Testing was conducted using a combination of FGW TR3 protocols and TR4 simulation models validated under the TR8 programme.
Timeline
H1 2026: Orders for StellaON exceeded 500 MW.
October 22, 2026: StellaON secured TÜV SÜD certification for German grids.
End of 2026: Planned completion of certifications in US, Spain, Austria, and Chile.
The Big Picture
The approval verifies that StellaON systems meet the requirements of German VDE-AR-N 4110, 4120 and 4130 standards. This milestone represents a technical shift that integrates international storage hardware into the stringent regulatory framework of the German energy sector.
Increased deployment of certified power conversion systems like StellaON may improve grid reliability and help stabilize renewable energy distribution. The technology's ability to handle high temperatures and peak power demands supports more robust integration of large-scale battery storage.
The takeaway
Reliable grid infrastructure depends on advanced power conversion technology that meets international safety and operational standards. Investors and energy stakeholders should monitor the regional rollout of these certified systems as they enter new markets throughout the coming months.
What happens next
Sinexcel is scheduled to complete national certifications for the StellaON system in the United States, Spain, Austria, and Chile by the end of 2026.
Further reading
Find more industry developments in the Energy section.
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