Solar cells are made of thin layers of silicon. Sunlight strikes the cells, chemical reactions release electrons, generating electric current. Individual cells are grouped together to form solar modules which generate electricity. We tested two, 10 watt units on our Haynes Hunting building. Our attic was 94 degrees on an Alabama June morning even though our attic has blown-in insulation. We attached a 10 watt solar panel on east roof. We then installed the attic fan in the gable area on one end of the building. In 30 minutes, our attic temperture was 7 degrees cooler. We attached another solar panel to the west end roof area and another attic fan in the opposite gable hole. In 30 minutes the attic temperture was 17 degrees less ! Our building is 1,400 square feet. We ran the fan wire outside the gable hole to the solar panel. We tucked the wire under the roof shingles. This setup is perfect for portable buildings, barns, chicken house, green house, kennels. It is also smart to keep a house's attic moisture free all year long to prevent rot and mildew. Scientific info: During hot summer months, temps an attic can exceed 160°Small, passive roof vents are woefully inadequate at dissipating heat. The attic acts like a giant radiator, passing excess heat back into your living spaces and driving up cooling cost. During cold winter months, heat trapped in your attic can melt snow that accumulates on your roof, water trickles down, refreezes at the cooler eaves, leading to destructive ice damming. Each year trapped moisture wreaks its havoc in everyday activities such as showering /cooking. Water vapor migrates into attic. Over time, this moisture promotes mildew growth, saturates your insulation, leads to fungal spore destruction of your roof decking.
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