Appendix D - PV measurements - calculated values
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14 Appendix D - PV measurements - calculated values
Calculation to STC
Measured voltage
and current
are calculated to STC as follows:
Short-circuit current calculated to STC values
Open-circuit voltage calculated to STC values
Measured short-circuit current
Measured open-circuit voltage
Irradiance at time of measurement
Irradiance at STC value (1000 W/m
2
)
Temperature at STC value (25 °C)
Temperature at time of measurement, including
Tcell correction (if applicable)
Irradiance correction factor (typical 0.06)
Temperature coefficient of Isc (A/°C)
Relative temperature coefficient of Isc (1/°C)
Temperature coefficient of Uoc (V/°C)
Serial resistance of PV module
Serial resistance of string
Number of modules in PV string
Number of PV modules in series
Number of PV modules / strings in parallel
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