
CHAPTER 2 SUMMARY
This chapter introduced solar radiation. The chapter covered topics including the concepts of
irradiance, irradiation, direct versus diffuse radiation, peak sun, peak sun hours, and insola-
tion. You also read about the nature of light.
This chapter also covered interesting facts about the relationship between the sun and the
Earth. This included factors you should consider when designing and installing a PV system,
such as the motion of the sun, altitude angle of the sun, Earth’s tilt, and its orbit around the
sun. Other factors discussed include day length measurements, ground reflection, and the
scattering of radiation ...