Snow soiling has tons of variables. I believe all three mainstream snow soiling models (Townsend, Marrion, and Andrew's) has very general approach and they do not consider the following: - Falling and accumulated Snow behavior on fixed tilt ground mount system - Falling and accumulated snow behavior for single or multiple axis trackers on ground mount systems - Falling and accumulated snow behavior for pitched roofs with flush mounted systems -Falling and accumulated snow behavior for flat roofs with certain degree tilted arrays. Flat roof building brings more challenge because snow has no where to go and if it is ever windy snow drifting keeps snow moving from one space to another In Canada and northern states realistic snow soiling in Jan, Feb, and March can be anywhere from 90% to 100%. Challenge is to estimate other wintry months. Anybody know of any other snow models then what I listed above? Cheers, Humayun
