The initial investment in solar panels is expensive. This can lead us to buy equipment very cheaply or from unreliable brands, which in the long run can lead to significant losses.

There is a wide and varied price range for solar panels. Some can be very cheap and therefore very attractive, greatly facilitating the expensive initial investment of a self-consumption system.

In solar technology, you should not choose the cheapest. These are teams that will work more than 50,000 hours in extreme weather conditions, either wind, rain and / or heat. Part of its profitability is linked to its durability and efficiency.

Defects of cheap solar panels.

If you are buying an unreliable brand or very cheap solar panels, you should be on the lookout for 10 critical flaws such as:

Hot spots.

In some places of the panel there are temperature increases. As a result, we have loss of efficiency and degradation of the panel. Its detection is only possible at an advanced stage of the problem, and it has no solution.

Separation of layers.

The panel must have the layers attached. If they are not properly sealed, moisture can penetrate. When this happens, the device is often damaged and over the years stops working properly or loses its effectiveness.

Poor quality glass.

When they are very cheap, glass with little resistance to the exterior elements is used and can shatter at any time.

Deformation of the photovoltaic solar panel.

If several of the above mentioned faults are combined, it is possible that the solar panel center and aluminum outer frame change shape, which will reduce the useful life of the panel.


When solar panels become discolored, it is due to a chemical reaction between the use of poor quality materials and solar irradiation.

Bypass diode problems.

These are devices located in the junction boxes of photovoltaic solar panels and are precisely designed to withstand extreme temperatures and conditions. If they are not well protected, they are damaged.

Defective welds.

When the welds are not done correctly, either because the correct temperatures are not used or because you are not using enough tin, they are left with flaws. In this case, hot spots are generated.

Possibility of fire.

Although this is not very common, there are times when a cheap, low-quality solar panel can catch fire.

So remember when you are going to invest in a photovoltaic solar panel, review the technical characteristics of the panel, the manufacturer, the warranty … it is an investment of 20-25 years.