Solar Panel Not Producing Enough Power? Delamination Could Be Why

  • Post last modified:March 30, 2026

Solar Panel Not Producing Enough Power? Delamination Could Be Why

In the transition toward renewable energy, solar power stands as the cornerstone of global sustainability. Homeowners, industrial facility managers, and utility-scale solar farm operators invest heavily in photovoltaic (PV) technology with the expectation of a 25-to-30-year lifespan. However, when performance begins to dip prematurely, the cause isn’t always as obvious as a cloudy day or a layer of dust. If you find your solar panel not producing enough power, one of the most insidious and damaging issues you might be facing is delamination.

Delamination is a structural failure within the solar module that compromises its ability to convert sunlight into electricity. It is often a “silent killer” because, in its early stages, it may not be visible to the naked eye. Yet, its impact on efficiency, safety, and the long-term return on investment (ROI) is profound. In this comprehensive guide, we will explore what delamination is, why it happens, how to detect it, and what can be done to prevent it through superior material science.

Understanding the Anatomy of a Solar Panel

To understand why delamination occurs, it is essential to understand how a solar panel is constructed. A standard crystalline silicon solar panel is a “sandwich” of several layers bonded together through a lamination process:

  • Tempered Glass: The top layer that protects the cells from the elements.
  • Encapsulant (usually EVA): A thin layer of Ethylene Vinyl Acetate that bonds the glass to the solar cells and provides cushioning.
  • Solar Cells: The semiconductor layers that actually generate electricity.
  • Backsheet: A polymer layer that protects the rear of the panel from moisture and provides electrical insulation.
  • Frame: Usually aluminum, providing structural rigidity.

Delamination occurs when the bond between these layers—specifically between the encapsulant and the glass or the encapsulant and the cells—begins to fail. When these layers separate, air and moisture are allowed to enter the module, leading to a cascade of performance issues.

Why Delamination Causes Power Loss

When a solar panel is not producing enough power due to delamination, several physical and electrical phenomena are at play. Here is how the separation of layers destroys efficiency:

1. Increased Internal Reflection

Solar panels are designed to allow as much light as possible to reach the silicon cells. The encapsulant has an optical index of refraction that minimizes light reflection at the glass-cell interface. When delamination occurs, an air gap is created. Air has a different refractive index than the encapsulant, causing sunlight to bounce off the internal surfaces rather than passing through to the cells. This reduces the photon count reaching the semiconductor, directly lowering the current output.

2. Moisture Ingress and Corrosion

The primary job of the encapsulant is to create a hermetic seal. Once that seal is broken by delamination, moisture enters the panel. Water vapor reacts with the metal grid lines (fingers and busbars) on the solar cells, leading to oxidation and corrosion. Corrosion increases electrical resistance, which generates heat and reduces the amount of power that can flow out of the panel.

3. Cell Cracking and Mechanical Stress

The lamination process provides structural integrity to the fragile silicon wafers. When the layers separate, the cells are no longer held firmly in place. Environmental factors like wind loads or thermal expansion can cause the cells to flex and crack. These micro-cracks further impede the flow of electrons, leading to significant power degradation.

Common Causes of Solar Panel Delamination

If you are wondering why your solar panel is not producing enough power, identifying the root cause of delamination is the first step toward a solution. Delamination is rarely caused by a single factor; rather, it is often a combination of environmental stress and manufacturing quality.

Extreme Thermal Cycling

Solar panels are subjected to intense temperature fluctuations. During the day, they can reach temperatures upwards of 65°C (149°F), while at night, they cool down to ambient temperatures. This constant expansion and contraction puts immense stress on the adhesive bonds between the layers. If the encapsulant material is of low quality, it will eventually lose its elasticity and peel away from the glass or cells.

UV Degradation

While solar panels are designed to sit in the sun, ultraviolet (UV) radiation is naturally destructive to polymers. Over decades, UV rays can break down the chemical bonds in the EVA encapsulant. This leads to “browning” or yellowing of the panel, followed by a loss of adhesion. High-quality UV stabilizers are required in the manufacturing process to prevent this, but budget-grade panels often cut corners here.

Humidity and Moisture

In coastal or tropical environments, high humidity is a constant threat. If the edge seals of the panel are not perfectly applied, moisture can wick into the edges of the laminate. This moisture weakens the chemical bond of the encapsulant, leading to edge delamination that slowly creeps toward the center of the panel.

Manufacturing Defects

The most common cause of early-onset delamination (within the first 5 years) is poor manufacturing. This can include contaminated surfaces during the lamination process, incorrect curing temperatures for the EVA, or the use of incompatible materials that don’t bond well together. Investing in panels from reputable manufacturers who use high-grade adhesives is critical.

How to Detect Delamination in Your Solar Array

Because delamination starts at the microscopic level, it can be difficult to spot until the power loss becomes significant. However, there are several methods used by professionals to identify the problem.

Visual Inspection

Look for bubbles or “voids” under the glass. These often look like silver or white patches where the glass has separated from the cell. You may also notice a “cloudy” appearance or yellow/brown discoloration in specific areas. If you see these signs, the panel is likely already suffering from reduced output.

Thermal Imaging (Thermography)

Using an infrared camera, technicians can spot “hot spots.” When a section of a panel delaminates and corrodes, it creates high electrical resistance. This resistance generates heat. On a thermal map, these areas will show up as bright spots. Hot spots are dangerous because they can eventually lead to the glass shattering or even fire.

Electroluminescence (EL) Imaging

EL imaging is like an X-ray for solar panels. By running a current through the panel in reverse, the cells glow. Areas that are delaminated or cracked will appear dark because they are no longer electrically active. This is the most accurate way to diagnose why a solar panel is not producing enough power due to internal structural failures.

I-V Curve Tracing

This involves measuring the current and voltage output of the panel across a range of loads. A “step” or a dip in the curve often indicates that certain cells are underperforming due to delamination or shading caused by internal layer separation.

The Impact on Your Investment

When a solar panel is not producing enough power, the financial consequences are two-fold. First, there is the immediate loss of energy production. For a large-scale solar farm, even a 5% drop in efficiency across thousands of panels can result in millions of dollars in lost revenue over the system’s life.

Second, there is the risk of total system failure. Delamination often leads to electrical arcing. When electricity jumps across a gap created by delamination or corrosion, it can melt the backsheet and create a fire hazard. In many cases, insurance companies may not cover damages if it is proven that the system was poorly maintained or that known defects like delamination were ignored.

To ensure your system remains profitable and safe, proactive monitoring is essential. If you suspect your hardware is failing, it may be time to consult with experts in material durability. Contact Our Team to learn more about how advanced materials can protect your energy assets.

Prevention: The Role of High-Performance Adhesives and Sealants

The best way to deal with delamination is to prevent it from happening in the first place. This starts at the manufacturing and assembly level. The longevity of a solar panel depends entirely on the quality of the chemicals used to bond it together.

Advanced Encapsulants

While EVA is the industry standard, newer materials like Polyolefin Elastomers (POE) are gaining popularity. POE offers better resistance to moisture and higher PID (Potential Induced Degradation) resistance. Regardless of the material, the curing process must be precise to ensure a permanent chemical bond that can withstand 25 years of weather.

Edge Sealants

The perimeter of the solar panel is its first line of defense. High-quality silicone or specialty polymer edge sealants are required to prevent moisture from entering the laminate “sandwich.” If this seal fails, delamination is inevitable.

Frame Bonding

The adhesive used to bond the laminate to the aluminum frame also plays a role. It must be flexible enough to allow for different rates of thermal expansion between the glass and the metal, yet strong enough to hold the panel together during high winds or snow loads.

Incure Lab’s Commitment to Durability

In the world of industrial adhesives and material science, the goal is to create bonds that never fail. At Incure Lab, we understand the stresses that renewable energy components face. By focusing on high-performance UV-curable adhesives and advanced sealants, the industry can move toward solar solutions that truly last their intended lifespan without the performance degradation associated with delamination.

Can Delaminated Panels Be Repaired?

A common question from system owners is whether a panel can be fixed once delamination has started. Unfortunately, the answer is usually “no” for the individual module. Because the lamination process happens under vacuum and high heat, once the layers have separated and oxygen/moisture have entered, the chemical damage to the cells is irreversible.

Attempting to “re-glue” a panel from the outside is a temporary fix that rarely restores power and does not address the internal corrosion. In most cases, the affected panel must be replaced. This is why warranties are so important. Most Tier-1 solar manufacturers provide a 25-year performance warranty that covers delamination, provided it wasn’t caused by external physical damage.

Future-Proofing Your Solar Installation

If you are in the planning stages of a solar project, or if you are looking to replace failing panels, consider the following steps to avoid the “solar panel not producing enough power” dilemma:

  • Source Tier-1 Modules: These manufacturers use higher-quality encapsulants and more rigorous quality control processes.
  • Check the Bill of Materials (BOM): If possible, inquire about the specific encapsulants and backsheets used. Materials from recognized global chemical leaders are generally more reliable.
  • Ensure Proper Airflow: Heat accelerates delamination. Ensure that panels (especially on rooftops) have enough space underneath for air to circulate and keep temperatures down.
  • Regular Maintenance: While you can’t stop UV rays, you can keep panels clean and inspect them annually for early signs of wear.

Conclusion

Solar energy is a long-term commitment. When you find your solar panel not producing enough power, it is easy to blame the weather or the inverter, but the physical integrity of the panel itself is often the culprit. Delamination is a serious issue that stems from the breakdown of the very materials that hold the panel together. By understanding the causes—from UV degradation to poor manufacturing—and knowing how to spot the signs early, you can take steps to protect your investment.

The future of solar depends on the durability of its components. As we continue to push the boundaries of efficiency, the role of material science and high-performance adhesives becomes even more critical. Ensuring that every layer of a PV module remains perfectly bonded for decades is the key to a sustainable energy future.

If you are a manufacturer or an industrial partner looking to enhance the durability of your components, or if you need expert advice on material bonding and protection, our specialists are ready to help. High-quality assembly is the best defense against the environmental stresses that lead to power loss.

Visit [www.incurelab.com](https://www.incurelab.com) for more information.