3 Software Overview
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high-impedance voltmeter. This assures that the PV source circuit is truly unloaded when
Voc is measured.
Figure 54. The voltage, current, and power data from the I-V measurement
Basis of PV Performance Predictions
The PVA software predicts the electrical output of the PV source under test (module or
string) based on the module performance model parameters, the existing irradiance and
temperature, and a number of other factors. The following discussion outlines the process
by which SolSensor is calibrated and measures irradiance, and the process by which the
PVA software predicts the expected I-V curve.
SolSensor Irradiance Calibration
The SolSensor factory calibration process involves this sequence of steps:
• Calibration of the electronic tilt sensor.
• Calibration of the angular response of the irradiance sensor.
• Calibration of irradiance measurement at air mass 1.0-1.5 and normal incidence,
relative to a pair of matched reference sensors
• The unique calibration coefficients are stored in SolSensor and are transmitted
to the PC software on demand.
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