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How do you know if a solar panel is good quality?

Good quality solar panels only use high-grade cells, while cheaper panels use lower grade cells, or a mix of different grades cells to keep costs down. You can tell this by an inconsistency in the colour of the cells across the one panel. Cells that are seconds may have cracks, chips and damaged surfaces.

How can I check the performance of a solar panel?

To check the performance of a solar panel, regularly check the yields indicated in the linear performance warranty graph in the solar panel datasheet. This graph shows what percentage of nominal power the solar module loses per year.

What should I look for when choosing a solar panel?

When choosing a solar panel, look carefully at the solar panel specifications and be informed about these points. The format provides information on the size of the solar module, which typically has dimensions of 1,67 x 1 x 0,035m. In the solar panel datasheet, dimensions are given in millimeters.

Is the price a good indicator of the quality of solar panels?

The price can be a good indicator of the quality of the panels. If the price is too good to be true then it probably is too good to be true! We constantly receive many proposals from Chinese manufacturers that offer cheap panels. This can be very tempting for sellers of solar panels as it means they can achieve a better profit margin.

How are solar panels tested?

During production all our solar panels are subjected to testing: • Electrical testing, i.e. voltage and current; plus • Electroluminescence (EL) testing. The electrical test confirms the current and voltage are within production limits while the EL test confirms that the cells are free of defects and are well matched.

Why does a quality solar panel have a lower energy production rating?

A quality panel has a lower tolerance of energy production rating because it will produce closer to its advertised energy production. This is the amount of energy the solar pales drop when at a specific temperature. If the coefficient is high, the panel produces less energy at the rated temperature. A temperature coefficient below 0.5% is good.

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