Category: Troubleshooting

Cracked solar panels can be a very serious problem for solar system owners. Although it is not often experienced, this could be a problem developed through time due to several reasons: thermal cycling, weather condition issues, and improper handling.

This article will walk you through steps on how to repair cracked solar panels, considering two major techniques: covering the panel with laminating film and using polyurethane.

In this work, we will look into what causes the panels to crack, explain why repairs are necessary, and go further to provide a step-by-step guide on how to undertake each of these methods of repair. An understanding of these methods might put you in a position to save some replacement costs by increasing the life of your solar panels.

It is, however, paramount to note that these practices are most effective if the crack issue is minor and that major damage may require a professional assessment or even replacement of the panel.

Can a Cracked Solar Panel Be Repaired?

Many homeowners, upon experiencing a cracked solar panel, are always kept guessing whether there is a way of fixing it without being burdened with expensive replacement costs.

Thankfully, in regard to small cracks, yes, there do exist some repair ways that will grant your solar panel an extended service life and functional efficiency.

The most accessible techniques in a self-sufficiency philosophy for the repair of cracked solar panels are laminating film and polyurethane.

Application of the laminating film involves laying a clear, waterproof film over the cracked panel and bonding it by using heat from a heat gun. That keeps it protected against moisture and keeps loose fragments of glass in place.

On the contrary, the polyurethane method involves the application of a quick-drying, weather-resistant coat of polyurethane over the panel. This liquid adhesive goes into the gaps, sealing the cracks and bonding together the shattered glass.

These techniques may work quite well for minor cracks, but one should not be oblivious to the fact that they are not infallible. For those panels that are badly damaged or if pieces of glass have started to flake off, these repair methods may not work effectively.

But in such cases or whenever you feel that the area of destruction is more than just trivial, it’s recommended you seek the service of a professional solar installer who will be in the better place to assess the condition and recommend the best course of action, which can be taken and may include replacement of the panel.

Common Causes of Cracked Solar Panels

Before discussing the techniques of repair, it is important to understand what causes cracks in solar panels in the first place. These causes will also help in preventing future damage and increase the life expectancy of your solar system.

Thermal Cycling
The primary causes of cracked solar panels are thermal cycling. During the day, there is a heat and cool cycle of the solar panels that consists of expansion and contraction of the materials. This can be repetitive enough to create micro-cracks in the glass layer, which over time may grow and develop into larger fractures.

Dynamic or Cyclic Pressure Loads
The panels can sustain some high winds and bad weather that may cause the panels to twist or bend moderately. As a result of these forces, there is a mechanical stress inside the glass layer that will finally cause the crack.

Hail Storms
Though solar panels are designed to bear elements of the weather, constant drumming by the hailstones can have a cumulative grinding effect on the surface of the glass, causing cracks eventually.

Improper Transportation and Handling
It is also during transportation or at installation that damage due to mishandling may occur. Dropping, bumping of panels or shifting during transport causes the panels to crack or have other structural defects.

Installation on Non-Planar Surfaces
The installing of solar panels on uneven surfaces creates points of stress which lead to bending or twisting of panels. This constant stress encourages the formation of cracks with time.

Manufacturing Faults
Sometimes, panels leave the factory with defects that are in the form of micro-cracks. These are further exacerbated by environmental factors with time.

Why Cracked Solar Panels Need to Be Repaired

Cracked panels in your solar system need your prompt attention to ensure that it works efficiently and lasts longer. Here are some reasons why:

Water and Moisture Resistance Compromised
The glass layer of a solar panel mainly provides protection from environmental factors internally. Once fissures appear, water can get into the panel and cause short circuits and damage to internal parts. In worst conditions, it can cause safety risks like electrical fire and electrocution hazards.

Flaking off Glass Surface
This causes parts of the surface glass to start flaking off with the development of fractures. In turn, this exposes internal parts directly to environmental hazards, greatly reducing the efficiency and life of the panel.

Methods of Repairing Cracked Solar Panels

Now that we understand the need for taking care of cracked panels, let’s look at two effective methods of repair:

Method 1: Encasing the Panel with Laminating Film

This is simple, low-cost, and quite efficient if the crack is small.

Materials Needed:

• Transparent laminating film
• Heat gun
• Squeegee or squiggle tool

Step-by-Step Process:

• Place the laminating film on top of the cracked solar panel.
• With the squeegee, spread out the film while eliminating any bubbles or folds between the panel surface and the film.
• Use the heat gun to bond the laminate film to the panel surface.
• This technique creates a waterproof barrier that keeps moisture at bay from ingressing, at the same time keeping glass pieces together, minimizing further flaking.

Method 2: Applying Polyurethane

Another efficient and much less costly repair method for broken solar panels includes the use of polyurethane.

Materials Needed:

• Fast-drying polyurethane-make sure it is water and weather-resistant
• Mixing container
• Squeegee or scraper

Step-by-Step Operation:

• Level the panel using a spirit level to ensure uniform coverage.
• Clean the panel thoroughly.
• Mix the polyurethane following the instructions on the manufacturer.
• Pour the majority of the polyurethane over the panel but leave some portion for reserve.
• Even out the squeegee or scraper over the surface with the polyurethane.
• Wait a few minutes for it to seep into the cracks.
• Fill in low spots with the remaining polyurethane.
• Let the panel fully dry out.
• Allow additional coats to take as needed to finish.
• The process tends to seal the cracks, which prevents moisture entry and helps keep the pieces of glass together in their places.

Effectiveness of the Various Methods of Repair

Success of these methods of repair largely depends on the extent of the damage:

Small Cracks:
Although the technique will work in a panel with just minor cracks, the laminating film and polyurethane methods work quite well. They are indeed capable of preventing the water from passing through and the flaking off of the glass, to prolong the life of a panel immensely.

Extreme Damage:
These repair methods might not be as successful if the solar panels have extensive cracking or the glass pieces have already begun breaking off. They still might offer some sort of protection but can’t return the panel to its original state and can’t stop further efficiency degradation.

Replacement over Repair: When to Decide

Sometimes, it pays much more to replace a panel rather than trying to fix it:

In cases where the cracks are so diffused that they occupy a big part of the panel area; A critical drop in efficiency was found to have resulted. Internal components have been severely damaged by water or other external factors. The cost for repair is close to what it would cost to have a new panel installed. With the glass theoretically replaceable, the low efficiency and high cost that it actually makes more sense to replace the panel as a whole.

Conclusion

Cracked solar panels can do serious damage to the performance and lifespan of your solar system, but most importantly, it can be unsafe.

The techniques shown here in this article are primarily useful for fixing minor cracks either by laminating film or applying polyurethane as an aid to block moisture intrusion which would eventually cause greater damage.

Keep in mind, however, that these do-it-yourself procedures are best suited for minor issues. If the cracks are widespread, or you are quite unsure about the extent of the damages, it always behooves you to seek advice from a professional solar panel installer. They will make a more competent assessment and advise you on what to do and whether some adjustments or replacement is called for.

Consistent checking of the solar panels can help find any faults in their early stages for easier repair and maybe altogether avoidance of replacement costs.

By understanding what has caused the crack and how to deal with it, you will be able to make sure that your solar investment keeps producing clean and efficient energy for many more years to come.