Tag Archives: air mass

Basic Solar Energy Math

It pays to understand the basic power and energy units used in the solar PV systems. Continue reading

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Sun and Its Sunshine

The radiant energy from the sun covers the entire electromagnetic spectrum; however, the atmospheric interference restricts this solar radiation spectrum to 290 nm to 3000 nm. The maximum spectral radiant energy, irradiance, is at around 500 nm. The amount of solar energy at any place varies with latitude and season, scattering and absorption by atmospheric gases, local climatic factors like cloud cover, humidity and pollution etc. Solar irradiance of the order of 1000 W/m2 is about the best sunshine obtained under clear skies. It is also the standard test condition for wattage rating of solar panels and is thus connected “sun hours” of insolation received at any location. Continue reading

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