If you have installed solar panels on the roof of your house you should know the common faults in solar panels


Top 5 Common failures in solar panels


Are there problems with the solar panels? And why is the quality of a solar panel so important in the long term? And why not think that all solar panels are the same. Read here a top 5 problem with solar panels.

1 Incorrect performance figures

By far, the most common: a panel that does not reach the maximum power specified. This applies in particular to cheaper solar panels (source: Eternal Sun in Delft). 

For example, it expects to buy a panel of 280 Wp, while in reality this does not exceed 260 Wp. With a difference of 4%, you will lose many hours of kilowatts. And it is almost impossible for you as a consumer to check the maximum power.

2 bubbles of air or moisture under the glass or between the layers.



To keep production costs as low as possible, some manufacturers take too long to laminate (join layers of glass, solar cells, backsheet) together. 

Good lamination leads to a vacuum between the layers. A too short and careless process can cause unwanted air bubbles. This leads locally to higher temperatures, which reduces efficiency.

 This can also cause moisture to get under the glass. The consequence of this is that the so-called delamination occurs. This means that due to the effect of moisture, the layers separate. 

Oxidation of contacts can also occur. Ultimately, this can cause the solar panel to lose its efficiency or even become completely defective.

3 access points in solar cells



It is important that you choose an installer that handles the solar panels very carefully. If a solar panel is overloaded locally, cracks may appear in the cell. 

These damages are called hotspots. The hot spots lead to additional resistance, as a result of which a cell becomes (also) locally hot. 

This leads to problems because the efficiency of the solar panels is decreasing. On the other hand, moisture can penetrate, causing oxidation. The panel will obtain a greater resistance and will generate a lower performance. Ultimately, this can even lead to a defect. See also  defective solar cells for new solar panels  .

4 Losses due to poor insulation.

Between the solar cells and the solar panel frame, a potential difference of more than 100 volts may appear. If the glass plate is subsequently wet (due to rain or condensation), the same potential difference will arise between the glass plate and the solar cells.

 Leakage currents arise that reduce efficiency. This only becomes evident after a few years. Therefore, it is important to choose a solar panel from a manufacturer that has been in the market for years. After all, they know the properties of their solar panel in the long term.


5 bad contact connections in the connection box



The so-called junction box is located under the solar panel. 

It is a plastic connection box in which the wiring is attached. 

With high solar radiation, the contacts and diodes in the junction box can get quite hot. 

It is important that a good cooling element is mounted on each diode in this junction box. This is usually made of aluminum. A bad cooling ensures a high resistance and therefore a lower efficiency. 

The quality of the junction box is sometimes saved, which means that there is a risk that arcs are formed and, therefore, everything becomes a fire risk.


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