Out of context I’m not sure exactly what you mean, but I’m guessing that what you are referring to is a chart that gives recommendations on the tilt angles of solar panels. For optimal efficiency, solar panels may be tilted toward the sun depending on which way your roof faces, or if you choose to have a ground mounted system. Depending on your geographical region, its most efficient to have the panels facing a certain way. For example, I live in Eastern PA, and for our area it’s most efficient to be facing pretty much due south. If your roof doesnt face due south, then you’ll want to tilt the solar panels so that they are facing due south to maximize efficiency. Thus, the chart will probably tell you the angle to tilt based on your area, or the direction of your roof.
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