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)[source]

Implements NREL’s PVWatts system loss model. The PVWatts loss model 1 is:

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

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

1

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