Solar Panels 20% Rule:When to Use It—and When to Adjust It
“Too small risks outages; too big wastes money.” Homeowners, stores, and factories all have to make the same choice when it comes to solar panels. The old “+20%” padding used to work, but things have changed since then: Micro-climates: A roof that faces north on the same street can get about 8% less than one […]
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