pvlib.pvsystem.pvwatts_losses

pvlib.pvsystem.pvwatts_losses(soiling=2, shading=3, snow=0, mismatch=2, wiring=2, connections=0.5, lid=1.5, nameplate_rating=1, age=0, availability=3)

Implements NREL’s PVWatts system loss model [R6767]:

\[L_{total}(\%) = 100 [ 1 - \Pi_i ( 1 - \frac{L_i}{100} ) ]\]

All parameters must be in units of %. Parameters may be array-like, though all array sizes must match.

Parameters:

soiling: numeric, default 2

shading: numeric, default 3

snow: numeric, default 0

mismatch: numeric, default 2

wiring: numeric, default 2

connections: numeric, default 0.5

lid: numeric, default 1.5

Light induced degradation

nameplate_rating: numeric, default 1

age: numeric, default 0

availability: numeric, default 3

Returns:

losses: numeric

System losses in units of %.

References

[R6767]

(1, 2) A. P. Dobos, “PVWatts Version 5 Manual” http://pvwatts.nrel.gov/downloads/pvwattsv5.pdf (2014).