What need to consider for solar panel mounting

Solar panel arrays are installed in many unique and innovative ways . The objective is a solidly mounted solar panel array that will last for many years and withstand all kinds of weather. First ,we need to consider the characteristics of various mounting materials :

1. Aluminum - lightweight, strong, and resistant to corrosion. Aluminum angle is an easy material to work with, holes can be drilled with commonly available tools, and the material is compatible with many PV module frames. Aluminum is not easy to weld.

2.Angle Iron - easy to work with but corrodes rapidly. Galvanizing will slow corrosion but mounting brackets and bolts will still rust, particularly in a wet environment. The material is readily available and brackets can be welded easily.

3.Stainless Steel - expensive and difficult to work with but will last for decades. May be a good investment in salt spray environments.

4.Wood - inexpensive, available, and easy to work with but may not withstand the weather for many years--even if treated with preservative. Attaching modules to a wooden frame requires battens or clips to hold them in place.

The foundation for the array should be designed to meet the wind load requirements of the region. Wind load depends on the size of the array and the tilt angle. Ask a local contractor how to anchor your array to withstand the wind expected in your area.

Changing the tilt angle of an array to account for seasonal changes in sun altitude is not required. For mid-latitude locations, a tilt angle change every three months is estimated to increase energy production about 5 percent on an annual basis. For most applications, the additional labor and the added complexity of the array mount does not justify the small increase in energy produced.

For roof mount , be sure to allow a clear air flow path up the roof under the array. The array will operate cooler and produce more energy if it stands off the roof at least 3 inches. Flush mounting solar panels to the roof of a building is not recommended. The modules are more difficult to test and replace, and the performance of the array is decreased because of the higher operating temperatures.

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