Does PV really work?
Yes. The PV modules only require daylight to work, and so will generate energy on dull and even rainy days. Temperature is also a factor when determining how much electricity a PV system will generate. The efficiency of a PV module decreases by a fraction for every degree the temperature is above 25 degrees Celsius. Therefore, a clear chilly day is perfect, because PV modules operate better at cooler temperatures.
