Part-load efficiency curve

What it is

The inverter's efficiency as a function of its load: a list of loads as fractions of the DC reference power of the efficiency curve and, for each, the efficiency between 0 and 1. It is used when no per-voltage curves are given.

Typical values and how to get it

From the OND file. Library entries carry a seven-point table derived from the Sandia inverter model. If not given: no part-load curve: above the threshold the output is the DC input times the maximum efficiency.

References

1. King, Gonzalez, Galbraith & Boyson 2007, Performance Model for Grid-Connected Photovoltaic Inverters, Sandia report SAND2007-5036
2. Driesse, Jain & Harrison 2008, Beyond the curves: modeling the electrical efficiency of photovoltaic inverters, IEEE 33rd Photovoltaic Specialists Conference

API

inverter.partload_curve