Not every location has the desirable characteristics for installing a solar module or array with a clear, unobstructed view of the sun. For example, the owner of a house with east and west-facing roofs needs to determine which direction will gain the most output from the sun, without having to design and install a costly tiltmount racking system. Are there nearby structures (buildings, trees, utility poles or towers) which cast shade on the desired location? If so, what times of the day, and months of the year is the shade problematic? Can the module or array be mounted on the ground, or on a pole? These issues may be dealt with by considering different module or array mounting options.