Is your feature request related to a problem? Please describe. It would be nice to have the Marion 2008 [1] nonlinear adjustment to the PVWatts V5 DC power model (pvlib.pvsystem.pvwatts_dc) available ...

I am working for the first time with pvlib-python and written a simple script to generate ac power output. Just a clear sky weather model, pvsyst freestanding temperature model, aoi model = ashrae and ...