StellaON PCS wins TÜV SÜD certification for German grids up to extra-high voltage
SINEXCEL (300693.SZ) says its StellaON 1250K/1575K power conversion system has received a unit certificate from TÜV SÜD confirming compliance with the German standards VDE-AR-N 4110, 4120 and 4130. The certification covers connections to medium, high and extra-high voltage grids for large-scale battery energy storage projects.
- TÜV SÜD certified SINEXCEL's StellaON 1250K/1575K PCS to VDE-AR-N 4110, 4120 and 4130.
- The certificate covers medium, high and extra-high voltage grids, including 220 kV and above under VDE-AR-N 4130.
- According to SINEXCEL, the PCS reaches 98.5% efficiency at full load and holds rated power up to 55°C.
- Certification is under way in the US, Spain, Austria and Chile, with completion expected by the end of 2026.
- Order volume exceeded 500 MW in the first half of 2026, according to the company.
What the certification covers
According to the company, the certificate allows the StellaON 1250K/1575K power conversion system (PCS) to be used in large battery storage projects at different levels of the electricity grid. The three German standards apply to storage installations connected to both distribution networks and the transmission system. VDE-AR-N 4130 applies to grids of 220 kV and above, where connection requirements take into account the stability of the entire power system.
TÜV SÜD assessed how the converters behave during grid disturbances, how they control active and reactive power, and how they respond to frequency changes. The process combines testing under FGW TR3 with validation of simulation models under TR4, as part of the TR8 programme. The validated DIgSILENT PowerFactory models let engineers assess converter behaviour within a complete energy storage installation.
Technical specifications
SINEXCEL states that the StellaON 1250K/1575K has a black start function and reaches an efficiency of 98.5% at full load. It keeps its rated power at ambient temperatures of up to 55°C without derating, and can operate at 1.5 times its rated power for up to 60 seconds.
The cooling system uses variable fan speed to hold noise at 65 dB. The company says this gives developers more freedom in siting equipment where noise limits apply.
Market status and project pipeline
StellaON holds EU certification as well as national certificates in Germany, Poland, Romania and other markets. It has been approved for use in Romania, Poland, the Netherlands, Belgium and Germany. Certification is under way in the United States, Spain, Austria and Chile, and is expected to be completed by the end of 2026.
More than 15 projects using StellaON in Europe, the Asia-Pacific region and Africa are currently in system integration, delivery or on-site commissioning. According to SINEXCEL, order volume exceeded 500 MW in the first half of 2026. The PCS has also been verified in countries and regions such as Vietnam and Myanmar, under extremely high temperature and humidity and in island microgrid applications.
SINEXCEL was founded in 2007. It says it has deployed energy storage systems with a combined capacity of 17 GW, 200,000 EV chargers and nearly 20 million amperes of active harmonic filters.
What it means for project developers
For project developers and EPC contractors, the certificate serves as a basis for selecting a PCS and preparing technical specifications suited to the voltage level of the grid connection. It also supports certification of the whole installation and the process of obtaining grid connection approval.
The company notes, however, that detailed design solutions and grid requirements remain subject to a separate assessment at the level of each individual installation.
