When searching for the best solar panels for your home, you should take into consideration a panel’s performance, quality, durability, and warranties. There are three major technical specifications that can help you as you make your decision: panel efficiency, temperature coefficient, and the materials warranty.
Solar panel efficiency
Solar panel efficiency refers to how well your solar panel can convert sunlight into usable electricity. A higher efficiency rating is better, because it means that your solar panel is able to convert more of the sunlight it captures into electricity.
The temperature coefficient tells you how well your solar panels will perform in less-than-ideal conditions. Solar panels are like any other kind of electronic equipment: they operate most efficiently when they are kept cool (ideally around 25° C or 77° F). The temperature coefficient gives you a sense of how your panel’s performance will degrade during hot summer days. For every degree above 25° C (or 77° F), your solar panel’s electricity production will decrease by the temperature coefficient. A lower temperature coefficient is better.
Most companies offer at least a 10-year materials warranty, but the best solar panel manufacturers will guarantee against equipment failures for 15 or even 25 years. Many of the manufacturers in our ranking offer a materials warranty of more than 10 years.
Keep in mind that while not taken into account in this rating, solar panels also come with a 25-year performance warranty as well. Manufacturers typically guarantee that their panels will produce electricity at 80-90% of their original output at the end of that warranty period.
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