In LG solar panel reviews, the https://sunnightsolar.com/jinko-solar-panels-review/ way we tend to measure performance is through the temperature coefficient. Generally, a solar panel will perform worse in certain meteorological conditions, namely when temperatures are too hot. As a convention, the set temperature is 25 °C: if the temperature goes above that number, then the panel will start losing its efficiency. By how much? That is precisely determined by the temperature coefficient.