API field
Diode ideality factor
Ideality factor of the one-diode circuit; not read, the model solves its own
Unit –
What it is
The ideality factor of the diode in the one-diode circuit model. The circuit model is fitted through the short-circuit current and the open-circuit voltage at standard conditions and a third point set by the One-diode STC point step: the datasheet maximum-power point, or a maximum equal to the nameplate. The ideality factor is the value that fit solves for, so this input does not enter the calculation; it records the value of the PAN file or the library fit.
Typical values and how to get it
The PAN value, or the library value derived from the CEC fit: for a CEC library module it is the CEC modified ideality factor over the thermal voltage of the cells in series at 25 °C, n = a_ref / (N_s × 0.025693 V). If not given: 1. The value is recorded, not used: the circuit fit solves its own ideality factor.
References
- De Soto, Klein & Beckman 2006, Improvement and validation of a model for photovoltaic array performance, Solar Energy 80(1) 78–88
- Mermoud & Lejeune 2010, Performance assessment of a simulation model for PV modules of any available technology, 25th European Photovoltaic Solar Energy Conference
API
module.n_0