When Should You Worry About Snow on Solar Panels?
The "Prediction of Energy Effects on Photovoltaic Systems due to Snowfall Events" research found that snow losses were relatively low for solar power generation — about 3 to 5 percent.
It was also found that in some cases, snow benefited solar power generation. The reflected sunlight from the white snow encouraged production and the snow kept panels cool.
The research offered some advice for developers of solar projects.
“During the system design, the effects of snow on PV system performance should be taken into account and not simply ignored.”