Quick Answer
To calculate solar panel tilt for your exact location, use the latitude of your location as the starting point, then adjust the angle based on your local climate and seasonal changes.
Understanding Latitude-Based Tilt
The ideal solar panel tilt angle is often recommended to be equal to the latitude of your location. For example, if you live in Phoenix, Arizona (latitude 33.4484°), a 33° tilt angle would be a good starting point. This angle allows the panels to receive direct sunlight year-round, with some adjustment for seasonal changes.
Accounting for Seasonal Changes
To account for seasonal changes, you can adjust the tilt angle by 15° to 20°. In the northern hemisphere, during winter months, you can increase the tilt angle by 15° to 20° to maximize winter sunlight exposure. Conversely, in the summer months, you can decrease the tilt angle by 15° to 20° to avoid excessive heat gain.
Measuring and Adjusting the Tilt Angle
To determine the optimal tilt angle for your specific location, you can measure the angle of the sun at different times of the day and year. Use a solar pathfinder or a protractor to measure the angle of the sun and adjust the tilt angle accordingly. Keep in mind that a 1° adjustment can result in a 2% difference in energy output, so it’s essential to make precise measurements.
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