It is always a good idea to look for the best place to buy solar panels before making a purchase. This would generally ensure that all the factors that add up to give an efficient and high-performance product are taken care of. One of the main things to ensure is that the temperature coefficient has a low percentage per degree Celsius. Given that the conversion efficiency is a measure of how much solar energy a panel can convert into electricity, you should look for a panel with a high conversion efficiency.
A good solar panel will also have very little potential induced degradation (PID). Along with all of these, it is also a good idea to analyze the warranty period granted by the company as it reflects the confidence the company shows in the panels. Keep in mind the fact that the light-induced degradation (LID) of a good solar panel is also little to none because an increased LID means that the amount of power produced by the panel is less.