Why is a compass alone insufficient to determine the optimal azimuth angle for a fixed tilt array

A compass is a tool that is used to determine the direction of magnetic north. While this is useful information, it is not enough to determine the optimal azimuth angle for a fixed tilt array for several reasons:

1. Magnetic North vs. True North: A compass points to the magnetic north, not the true north. The optimal azimuth angle for a solar panel is typically relative to the true north, not the magnetic north. The difference between the two is known as magnetic declination, which varies depending on where you are on the Earth.

2. Sun's Position: The optimal azimuth angle also depends on the position of the sun, which changes throughout the day and throughout the year. A compass cannot provide information about the sun's position.

3. Local Conditions: The optimal azimuth angle can also be affected by local conditions, such as shading from nearby buildings or trees. A compass cannot provide information about these local conditions.

4. Latitude: The optimal tilt of a solar panel also depends on the latitude of the location. A compass cannot provide information about the latitude.

Therefore, while a compass can provide some useful information, it is not sufficient to determine the optimal azimuth angle for a fixed tilt array. Other tools and information are also needed.