MUNICH, July 13, 2026 /PRNewswire/ -- During the Intersolar Europe 2026 exhibition, Sungrow and TÜV Rheinland jointly launched the world's first quantitative long-term reliability standards for PV inverters, including 2 PfG 3325 Reliability test qualification for IGBT modules in photovoltaic power systems and power electronic converter systems and 2 PfG 3328 - Part 2 Specifications for Reliability Testing and Assessment of Power Electronic Products - Part 2: Power Conversion Equipment (PCE).

Sungrow's SG510HX string inverter and its IGBT modules were among the first products certified under the two standards, providing early validation of the framework in practical applications.

Meeting the Demands of Modern PV Plants

As PV power plants continue to expand into increasingly demanding environments such as deserts, offshore locations, and high-altitude regions, ensuring inverter reliability over 25 years of operation has become increasingly important for project owners and investors. However, existing reliability qualification methodologies were not originally designed to fully capture the increasingly diverse and demanding operating conditions of modern PV plants, creating a gap between laboratory qualification and long-term field performance.

To address this challenge, Sungrow and TÜV Rheinland have developed a comprehensive reliability evaluation framework that enables a more scientific, quantitative, and traceable assessment of inverter lifetime performance.

From Systems to Components: A Unified Reliability Validation Framework

Facing the shortcomings of traditional standards, the dual framework establishes a robust, quantifiable reliability methodology spanning the entire "system-component" validation continuum.

• 2 PfG 3325 (IGBT Reliability Test Standard) is a component-level standard, addressing the failure mechanisms and lifetime models of power semiconductors under stresses such as thermal cycling and power cycling.
• 2 PfG 3328 - Part 2 is a system-level reliability verification standard, focusing on the performance degradation and lifetime assessment of PV inverter complete machines under complex environmental stresses, with core emphasis on verifying the product's environmental adaptability within the designed service life.

Together, the standards establish a system-to-component validation chain: 2 PfG 3325 provides a quantitative data basis for inverter -level reliability modeling and supplier evaluation, while 2 PfG 3328 - Part 2 defines a unified inverter -level validation framework with testable and traceable criteria.

New Standards Upgraded for Complex Scenarios

Addressing the issue of insufficient coverage in traditional standard scenarios, the standards added several enhanced test items designed for complex operating conditions.

• At the system level, 2 PfG 3328 - Part 2 covers long-term durability, environmental adaptability, and grid-connected operation under diverse operating conditions, with additional requirements such as 4,000-hour accelerated aging tests and continuous low- and high-voltage ride-through verification.
• At the IGBT level, 2 PfG 3325 strengthens conventional qualification methods by extending HTGB testing to 168 hours at 1.1 × VGES and introducing an additional 500 temperature cycles under mechanical loading conditions beyond the standard 2,000-cycle thermal cycling requirement.

The standards significantly strengthen reliability verification by expanding test coverage for complex operating scenarios.

Quantifiable Lifetime Assessment

To improve the quantitative assessment of long-term field reliability, the standards establish data-driven lifetime models based on extensive field performance data from PV power plants. The standards also draw on automotive components' reliability testing and quality verification standards such as VW 80000 and GMW 3172, adopting more stringent test approaches to evaluate long-term stability under complex operating conditions.

"The two standards establish a structured and verifiable framework for long-term inverter reliability evaluation, offering valuable references for manufacturers, investors, and insurers in assessing lifecycle performance," said Thomas Haupt, Vice President of Solar & Commercial Products, European Region of TÜV Rheinland Group.

Why Sungrow

As the pioneering architect of these standards, Sungrow leveraged its 29 years of expertise in power electronics together with extensive global project experience and operational insights across diverse climates and applications. Steering the reliability evaluation of PV inverters away from subjective empirical deductions toward a scientifically quantifiable, verifiable, and traceable future.

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Bundesrettungskommandant Gerry Foitik verweist darauf, dass der Bedarf an Blutkonserven keinen Urlaub kenne. Blut werde nicht nur für Operationen benötigt, sondern ebenso für Geburten, Krebstherapien und die Behandlung verschiedener Erkrankungen. Gerade vor dem Sommer sei es daher wichtig, einen Termin zur Blutspende zu vereinbaren, betont Foitik. Spendenzeiten und -orte sind auf der Plattform blut.at gelistet, über die auch Terminreservierungen möglich sind.

Am Sonntag, dem 14. Juni, fallen Vatertag und Weltblutspendetag zusammen – ein Datum, das das Rote Kreuz für eine groß angelegte Aktion in Wien nutzt. In der „Arena 21“ im Museumsquartier (Museumsplatz 1, 1070 Wien) können Interessierte zwischen 10 und 12 Uhr sowie von 13 bis 16 Uhr Blut spenden. „Mit einer Blutspende retten Sie Leben“, sagt Simon Gänsdorfer, Leiter der Blutspende für Wien, Niederösterreich und das Burgenland. Die Aktion ist auch als Familienevent angelegt und soll insbesondere jüngere Menschen für das Thema sensibilisieren.

Begleitet wird die Veranstaltung im Museumsquartier von DJ-Musik, Vitamin-Mocktails, Gewinnspielen und einer Kids Area. Das Rote Kreuz setzt damit bewusst auf ein niederschwelliges Angebot, um Hemmschwellen beim Blutspenden zu senken und zusätzliche Zielgruppen anzusprechen. Neben der Sonderaktion am Weltblutspendetag bleibt die Blutspendezentrale in Wien (Wiedner Hauptstraße 32, 1040 Wien) ganzjährig geöffnet; auch in allen anderen Bundesländern bestehen laufend Möglichkeiten zur Blutspende.