---
title: Setting a new standard for module reliability with testing innovation
description: As the solar industry grows, ensuring long-term module reliability has become a top priority. LONGi, a global leader in solar manufacturing, is setting new benchmarks with rigorous testing innovations that go beyond existing standards to ensure high performance and durability.
---

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# [Setting a new standard for module reliability with testing innovation](https://pes.eu.com/digital-blog/setting-a-new-standard-for-module-reliability-with-testing-innovation-1)

 Written by [Negin Hashemi](https://pes.eu.com/digital-blog/author/negin-hashemi) | Jan 31, 2026 2:52:53 PM

### **Raising Reliability Standards in Solar Modules**

As the solar industry grows, ensuring long-term module reliability has become a top priority. LONGi, a global leader in solar manufacturing, is setting new benchmarks with rigorous testing innovations that go beyond existing standards to ensure high performance and durability.

### **Why Reliability Matters**

Solar developers aim to maximize ROI and minimize LCOE, which hinges on consistent energy output and low operating costs over decades. Reliability is crucial for:

- Avoiding critical system failures like glass breakage or microcracks.
- Preventing gradual performance degradation that lowers energy yield.
- Meeting investor and market expectations for 25-30 year lifespans.

### **Limitations of Existing Standards**

Current IEC standards like IEC 61215 provide a foundational benchmark, but:

- They simulate real-world conditions imperfectly.
- They don’t account for the interactions between stressors in diverse climates.
- They often rely on cycle-based degradation models that aren't fully predictive.

### **LONGi’s Data-Driven Reliability Approach**

LONGi invests heavily in R&D to simulate field-specific failure modes. Key initiatives include:

- Forensic analysis of failure mechanisms observed in real-world settings.
- Custom testing methods that mimic these failures under realistic stressors.
- Use of full-sized modules and customized tests to ensure relevance and accuracy.

### **Technology-Driven Innovations**

LONGi has introduced a suite of testing breakthroughs, including:

- **Four-Point Bending Test:** Detects microcracks by simulating actual cell deformation.
- **Local Thermal Shock Resistance Test:** Improves screening for glass durability under hotspot conditions using localized 200°C heating on full modules.
- **Low-Temperature Load Test:** Simulates snow and cold-induced stress using historical climate data to enhance performance in northern regions.
- **High-Temperature Reverse Bias Test:** Subjects bypass diodes to 100°C to preempt failure in hot climates and reduce fire hazards.

### **Impact on Supply Chain and Industry**

These stringent standards have enabled LONGi to:

- Eliminate underperforming suppliers at the earliest stages.
- Standardize higher-quality materials across the board, including EVA and junction boxes.
- Offer robust "Lifecycle Quality" guarantees that build trust, especially in emerging or cold-weather markets.

### **Shaping the Future of Solar Module Testing**

By pushing beyond basic compliance, LONGi advocates for industry-wide collaboration to:

- Identify core causes of module failure.
- Establish advanced, real-world testing frameworks.
- Build a more reliable and respected solar industry globally.

Read the full article here: https://pes.eu.com/exclusive-article/setting-a-new-standard-for-module-reliability-with-testing-innovation/

[View full post](https://pes.eu.com/digital-blog/setting-a-new-standard-for-module-reliability-with-testing-innovation-1)

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