IN Brief:
- Sungrow is integrating onsemi EliteSiC hybrid modules into the PowerTitan 3.0 energy storage platform.
- The companies report a 0.4% inverter-level efficiency improvement and peak efficiency exceeding 99.3%.
- The figures are vendor claims for the conversion architecture, not independently measured whole-system efficiency.
onsemi has announced that Sungrow will use its EliteSiC hybrid power modules in the PowerTitan 3.0 utility-scale battery energy storage platform. The devices form part of a three-level inverter architecture that converts DC electrical power from battery systems for connection to an AC network. The companies report a 0.4% improvement in inverter-level efficiency compared with the previous platform, a figure attributed to their own evaluation rather than independent whole-site testing.
A storage inverter regulates the electrical exchange between a battery and the connected network. During discharge, semiconductor switching devices produce an AC waveform from the DC supply; compatible conversion equipment also manages charging power in the opposite direction. Control circuits adjust switching behaviour to meet operating requirements, while filters and protection devices help manage disturbances and faults.
The efficiency of this process depends partly on conduction losses while a device carries current and switching losses as it changes between operating states. Both become important at the high power ratings used in utility-scale storage. Losses appear as heat, requiring thermal management that may influence equipment size, reliability and service requirements.
Silicon carbide devices can offer lower switching losses than some conventional silicon devices under suitable conditions. Their advantage depends on voltage, current, temperature, switching frequency and the surrounding circuit design. Faster transitions may introduce electromagnetic compatibility challenges, and the gate-drive and cooling arrangements must be designed to accommodate the devices. The selection of a SiC module is therefore one component of the inverter’s performance, not a guarantee of system-level improvement.
Sungrow’s converter uses a three-level architecture. Instead of switching directly between only two voltage states, it can construct the output waveform using an intermediate level. That can reduce the voltage step associated with individual transitions, affecting harmonic content, semiconductor stress and filtering requirements. The additional operating states also introduce more complex control decisions and must be managed across a range of load conditions.
The company describes power conversion units rated up to 450kW and peak efficiency exceeding 99.3% for the relevant architecture. A peak rating applies at a particular operating point. Real installations operate at changing loads and temperatures, with conversion losses varying across the operating profile. Comparing complete storage systems therefore requires efficiency curves, charging and discharging duty cycles and an assessment of battery and auxiliary equipment losses.
A 0.4% improvement at inverter level can still affect energy losses when large amounts of power repeatedly pass through the conversion stage. However, the amount saved depends on annual energy throughput and the conditions under which the new and old equipment are compared. The company has not disclosed sufficient independent site data to convert its reported improvement into a universal annual energy or operating-cost saving.
The EliteSiC modules are described as high-density power integrated modules for this application. The release does not establish the complete internal transistor arrangement of every variant, so it would be inappropriate to assign an undocumented topology or specific thermal characteristic to all the devices. Module qualification must address electrical cycling, thermal stress and the interaction of the semiconductor package with the converter’s cooling design.
Sungrow is targeting utility-scale installations in which the conversion stage works alongside battery containers, controls, protection and grid connections. Those systems must also meet local electrical codes, interconnection requirements and performance contracts. Semiconductor efficiency contributes to usable energy but does not replace the need to evaluate availability, degradation and operational constraints.
The companies describe ongoing work on the platform and forecast European deployments, but the announcement does not present independently verified operating results across completed PowerTitan 3.0 sites. The established development is a specific semiconductor design selection for a commercial storage architecture, with system-level performance remaining dependent on the conditions of each installation.
