Solar energy is often associated with bright, sunny skies, but what if you live in Western Washington, where the weather is often cloudy? A lot of times, we hear comments like, “Solar is great, but not in Seattle,” or, “I’d go solar if I didn’t live in Tacoma.”
You might be surprised to learn that solar panels can still generate electricity in overcast conditions, thanks to advances in solar technology. If you live along the I-5 corridor in Washington state, or in another area with frequent cloudy days, choosing the right solar panels is key to maximizing efficiency.
Light, Not Heat
Solar panels capture light, not heat, to generate electricity. While clouds reduce the amount of sunlight reaching the panels, they don’t eliminate it.
Diffused sunlight can still produce energy, though output may drop by 10–25% on overcast days. High-quality panels are designed to be efficient even in low-light conditions, making them ideal for cloudy climates.
Monocrystalline Panels: A Clear Winner
Monocrystalline solar panels are the top choice for cloudy regions. These panels are made from high-purity silicon and have a sleek, uniform appearance.
Their high energy conversion efficiency — often ranging from 18–22% — allows them to perform well in low-light environments. Monocrystalline panels are slightly more expensive than other types, but their superior performance in cloudy conditions makes them a worthwhile investment.
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Brands to Consider
Several brands stand out for their performance in cloudy conditions:
- LG: Known for its high-efficiency monocrystalline panels, LG offers excellent durability and output.
- SunPower: Renowned for its industry-leading efficiency, SunPower panels perform exceptionally well — even on overcast days.
- Panasonic: With advanced technology to optimize energy capture, Panasonic panels are another strong contender.
Thin Film Panels for Diffused Light
Thin-film solar panels are another option for cloudy areas. While less efficient overall than monocrystalline panels, they excel in capturing diffused light and maintaining steady output.
Their lightweight, flexible design also makes them suitable for unique installations. However, due to their lower efficiency, they may require more space to achieve the same output.
Other Optimization Options
To enhance efficiency, consider installing a battery storage system to store energy for cloudy periods. Regular maintenance and proper panel placement, such as angling them to capture maximum light, also help optimize performance.
By choosing the right solar panels and taking advantage of additional ways to optimize your solar array, you can ensure consistent energy production — rain or shine — even during overcast Washington winters. If you have more questions or want to learn about the right solar installation for the climate in your area, contact us at Solora Solar to get a free consulation.
Photo credit: Kevin Dooley