It's a common myth that solar panels don't work during winter. Most homeowners save. . Cold Weather Actually Boosts Solar Efficiency: Solar panels operate 10-13% more efficiently in winter temperatures of 32°F compared to their rated capacity at 77°F, as electrons move more freely and electrical resistance decreases in cooler conditions. They generate electricity even on cloudy days. Do they produce enough energy in colder months? Solar panels rely on sunlight, not heat, to generate power. . But for homeowners who live in areas with heavy winter storms or frequent days of little to no sunlight, one concern is: Do solar generators work in the winter? This quick guide will answer your question, including how solar generators work in the winter and the factors affecting their efficiency. In this article, we'll debunk winter solar myths, explain why fall is an excellent time to go solar, and help you understand how to prepare your home to take full advantage of. . One of the most common questions people who have worked in solar get from homeowners is “What happens to solar performance in the wintertime?” I worked in the Midwest, where winters are cold, dark, and snowy.