Standard solar irradiance meters provide measurements calibrated to sunlight spectra and do not have the low-light-level capability needed for indoor applications. Light meters, specifically designed for human visible artificial light applications, measure illuminance.
The solar illuminance (or intensity) was measured with a Digital Illuminance Meter (DT-1309). The result spells that the current rises steadily with increase in solar illuminance or intensity.
Then the readings from the lux meter could be multiplied by this constant to estimate values of solar irradiance that would be measured by a pyranometer. the irradiance values from a calibrated Apogee SP-230 pyranometer aimed vertically, the normal position for global horizontal irradiance (GHI) measurements, as seen in the photo.
When solar cells are utilized for indoor applications or integrated into a building, they are generally exposed to variable irradiance intensity. The performance of a solar cell is influenced by this variation as its performance parameters, viz. open-circuit voltage (Voc), short-circuit current (Isc), fill factor (FF) and efficiency (η).
The solar illuminance (or intensity) within the weather parameters' ranges of 77 o F – 90 o F (air temperature), 30 inHg – 29.85 inHg (air pressure), 66 % and 89 % (relative humidity) and 5 mph – 10 mph (Wind speed), mainly in the WSW direction was measured and simultaneously the output current and voltage.
The performance of a solar cell is influenced by this variation as its performance parameters, viz. open-circuit voltage (Voc), short-circuit current (Isc), fill factor (FF) and efficiency (η). These performance parameters are in direct relationship to * Corresponding author.