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The choice of solar panel is essential to achieve a functional and efficient photovoltaic system. Below you will find a series of tips to optimize your purchase.

With so many manufacturers of photovoltaic solar panels around the world, it is important to know how to assess the quality of this type of equipment through the analysis of certain specifications. These specifications are responsible for the performance, quality and durability of the photovoltaic solar panel.

There are dozens of solar panel manufacturers. Each with several models; And even the most discerning consumer will be overwhelmed to review the specifications of each of the different models of solar panels. But this choice does not have to be a stressful experience!

For me the most important thing that should guide your purchasing decision is the quality. For this you need to take into account the following specifications:

Manufacture of solar panels. Image: Humphery Shutterstock


Represents the Efficiency with which a panel converts solar energy into electrical energy.


It is determined based on your output power or the amount of energy they can produce under standard conditions.

Regarding the power tolerance, the concept refers to how much the actual power can differ in% from the classification which is described in the datasheet.


The International Organization for Standardization (ISO) defines a series of quality standards which are framed in the ISO 9000.

If a producer of solar panels has this certificate, they meet the quality standards defined in the standard.


For its measurement the IEC 6125, which performs stress tests on panels that simulate decades of wear and tear they suffer from when working outdoors.

Classification system for solar panels.

The classification system is objective and is based on certain points which lead to a quick decision.

Take into account some specifications of the manufacturer, how the technical support, guarantees and other documents available to the public. This information is used to create a ranking of the best brands of solar panels and power systems on the market.

Classification of solar panels.

Inexpensive solar panels.

Only take them into account if you have a very low budget. These panels tend to produce less energy than good quality panels under the same conditions. It’s possible that they degrade harsh weather conditions sooner, reducing their useful life.

Signs with a plus symbol represent better-than-average options in their class.

Standard solar panels.

Standard solar panels work well under most conditions and circumstances. It has a good classification compared to efficiency, power, among other technical specifications.

They also meet standards for quality, good support and warranty, as well as durability and service life.

High quality solar panels.

They generate more electricity per cm2 than standard panels. The initial price is above average due to its high performance. It has premium guarantees. Recommended for special installations due to the conditions and the need for power generation.