Effects on PV System Output

Loss models

pvsystem.combine_loss_factors(index, *losses)	Combines Series loss fractions while setting a common index.
pvsystem.dc_ohms_from_percent(vmp_ref, ...)	Calculates the equivalent resistance of the wires from a percent ohmic loss at STC.

Snow

snow.coverage_nrel(snowfall, poa_irradiance, ...)	Calculates the fraction of the slant height of a row of modules covered by snow at every time step.
snow.fully_covered_nrel(snowfall[, ...])	Calculates the timesteps when the row's slant height is fully covered by snow.
snow.dc_loss_nrel(snow_coverage, num_strings)	Calculates the fraction of DC capacity lost due to snow coverage.

Soiling

soiling.hsu(rainfall, cleaning_threshold, ...)	Calculates soiling ratio given particulate and rain data using the Fixed Velocity model from Humboldt State University (HSU).
soiling.kimber(rainfall[, ...])	Calculates fraction of energy lost due to soiling given rainfall data and daily loss rate using the Kimber model.

Shading

shading.masking_angle(surface_tilt, gcr, ...)	The elevation angle below which diffuse irradiance is blocked.
shading.masking_angle_passias(surface_tilt, gcr)	The average masking angle over the slant height of a row.
shading.sky_diffuse_passias(masking_angle)	The diffuse irradiance loss caused by row-to-row sky diffuse shading.

Spectrum

spectrum.spectrl2(apparent_zenith, aoi, ...)

Estimate spectral irradiance using the Bird Simple Spectral Model (SPECTRL2).

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