Sinexcel PWX1-1250KTL-H-EX 1.25MW 1250kW Utility Scale Energy Storage Inverter
Flexible Configuration
5MWh, 1C, 0.5C and 0.25C application
High Efficiency & Stablility
Support to use 4 units parallel in both AC and DC simultaneously
Intelligent Collaboration
VSG & PQ & VF multiple operation modes
Grid-friendly
Precision Source-Grid-Load switching function
Product Description
PWX1-1250KTL-H-EX is a high-power, utility-scale energy storage inverter developed by Sinexcel. This model is part of the StellaON series—Sinexcel‘s flagship product line for large-scale energy storage applications—engineered to optimize project economics, safety compliance, and grid integration complexity.
With an output rating of 1,250 kW (1.25 MW) and advanced bi-directional power conversion capabilities, the PWX1-1250KTL-H-EX is designed for grid-scale battery energy storage systems, renewable integration, photovoltaic power stations, frequency regulation markets, and peak-shaving applications.
High Efficiency & Lifecycle Performance
Achieves a conversion efficiency of over 99%, ensuring minimal energy loss and maximum system ROI.
Features three-level topology technology, reducing switching losses and improving waveform quality.
Engineered for full-lifecycle operational efficiency, delivering robust performance across diverse environmental and load conditions.
Bi-Directional Power Conversion
Supports simultaneous charging and discharging of battery storage systems, enabling multiple revenue streams such as peak shaving, frequency regulation, voltage support, and peak-valley arbitrage.
Enables black start and off-grid parallel operation, ensuring critical power supply under extreme grid conditions.
Grid Support & Compliance
Provides comprehensive grid support functions: active power control, reactive compensation, low voltage ride-through (LVRT), and frequency regulation.
Fully certified for European markets: StellaON 1250K/1575K officially obtained EN 62477 (CE electrical safety), EN 50549 (dynamic grid compliance), and EN IEC 61000 (electromagnetic compatibility) certifications.
Compatible with over 20 major BMS communication protocols, ensuring seamless integration with diverse battery systems.
Scalable & Deployable
Available in multiple medium-voltage integrated configurations, supporting flexible project scaling and efficient on-site deployment.
Proven field performance with successful project deployments across Vietnam, Poland, Czech Republic, Bulgaria, Romania, and Central America.
Applications
The PWX1-1250KTL-H-EX is ideal for:
Grid-scale battery energy storage systems: Peak shaving, load leveling, and grid stabilization.
Renewable + storage integration: Pairing with solar PV or wind power plants to smooth output and increase dispatchability.
Frequency regulation markets: Fast response times for grid frequency control.
Microgrids & industrial backup power: Off-grid parallel operation and black start capability.
Utility projects: Enhancing grid resilience and enabling renewable energy curtailment reduction.
FAQ
The PWX1-1250KTL-H-EX is a 1,250 kW (1.25 MW) utility-scale energy storage inverter from Sinexcel, designed for grid-scale battery energy storage systems, renewable integration, and frequency regulation applications. The model number breaks down as follows:
1250K: Refers to the 1,250 kW rated power output.
TL: Stands for transformerless design, enabling higher efficiency and reduced component count.
-H: Likely denotes a high-voltage DC input configuration for battery compatibility.
-EX: Indicates international expansion/export certification, signifying compliance with global market requirements.
The PWX1-1250KTL-H-EX is a bi-directional power conversion system (PCS) that enables simultaneous battery charging and discharging, allowing energy storage systems to participate in multiple revenue-generating applications including peak shaving, frequency regulation, voltage support, and wholesale market arbitrage.
The PWX1-1250KTL-H-EX achieves over 99% conversion efficiency through its advanced three-level topology technology. This architecture reduces switching losses (the energy dissipated during transistor state transitions) while simultaneously improving the quality of the output AC waveform. By minimizing energy loss during both charging and discharging cycles, the inverter ensures maximum system ROI over the project’s entire operational lifetime.
The PWX1-1250KTL-H-EX features advanced grid-forming technology that shifts from passive grid-following to active grid-supporting operation. In practice, this means:
Black start capability: The inverter can initiate system startup from a complete blackout without relying on external grid power, using only stored battery energy to “self-commutate” and begin supplying loads.
Off-grid parallel operation: Multiple inverters can operate in parallel to form a standalone microgrid, maintaining power supply to critical facilities during prolonged grid outages.
This capability is particularly valuable for islands, remote industrial sites, and regions with weak grid infrastructure where power reliability is a primary concern.