pvperfsolar performance modeling

Reference

API field

Pmax temperature coefficient

Change of the maximum power per degree

Unit %/°C

What it is

How much the maximum power changes per degree of cell temperature. The field is in percent per degree; the API takes a fraction per degree (−0.0034 for −0.34 %/°C). The API refuses a value below −0.02 or above 0.01 per °C. When the ideality factor temperature coefficient is 0 or empty, the model fits it so that the power between 25 °C and 45 °C follows this coefficient.

Typical values and how to get it

The datasheet value: −0.24 to −0.45 %/°C for crystalline silicon, heterojunction at the low end; about −0.28 to −0.32 %/°C for cadmium telluride. If not given: −0.40 %/°C, also when a PAN file has no muPmpReq.

References

  1. Mermoud & Lejeune 2010, Performance assessment of a simulation model for PV modules of any available technology, 25th European Photovoltaic Solar Energy Conference

API

module.mu_p_mp — sent in 1/°C