Difference between revisions of "Solar Module Mounting"
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| − | + | = Overview = | |
| − | Solar modules | + | <u>When deciding about the optimal mounting location for [[Solar Cells and Modules|solar modules]] the following criteria should be considered:</u> |
| + | #To which extent does the place receive high radiation of sunlight? | ||
| + | #is it free of shading? | ||
| + | #is it not exposed to dust and other particles which may cover or damage the modules? | ||
| + | #will the modules be exposed to excessive heat? | ||
| + | #does the place offer [[Tools to Prevent Theft of Panels|protection against theft]] and vandalism? | ||
| + | #is it close to the battery? | ||
| − | + | <br/> | |
| + | Solar modules can be mounted in a fixed, flexible or tracking way. | ||
| + | |||
| + | <br/> | ||
| + | |||
| + | = Fixed Modules = | ||
| + | |||
| + | <u>Fixed modules (either as single module or as array of several modules) are mounted on:</u> | ||
*a pole, | *a pole, | ||
*a roof, | *a roof, | ||
*free-standing on a ground support or | *free-standing on a ground support or | ||
| − | *[[Building Integrated Photovoltaics (BIPV)|integrated into a building]]. | + | *[[Building Integrated Photovoltaics (BIPV)|integrated into a building]]. |
| + | |||
| + | Fixed mounting structures tilt the modules at a fixed angle determined by the latitude of the site, the requirements of the [[Lamps and Electric Appliances|load]] (appliances which are powered by the PV power system) and the availability of sunlight. The fixed mounts should be stable, flat and well ventilated. They must withstand heavy wind and heavy rainfall. | ||
| + | |||
| + | <br/> | ||
| − | + | = Flexible System = | |
Flexible system use basically the same mounting structures, but the modules are removable. | Flexible system use basically the same mounting structures, but the modules are removable. | ||
| − | Tracking structures are more expensive and require higher maintenance efforts. | + | <br/> |
| + | |||
| + | = Tracking Structures = | ||
| + | |||
| + | Tracking structures are more expensive and require higher maintenance efforts. The trackers orient the modules towards the Sun, thus increasing their output. | ||
| − | + | <br/> | |
| − | For '''roof mounting '''the most common support structure | + | = Mounting (Pole / Roof / Free-standing / Building Integrated) = |
| + | |||
| + | Modules that are mounted '''on a pole''' are easy to install an can be easily oriented towards the Sun. They can be free-standing or installed on the side of a building. Usually, a small array of one or to modules is mounted per pole. Thus, pole mounting is suitable for small [[Solar Home Systems (SHS)|solar home systems]], especially, if the roof support structure of the house is not stable enough to support a PV array. | ||
| + | |||
| + | For '''roof mounting '''the most common support structure consists of racks. It is important to leave a space of at least 10 cm between the roof and the array to allow ventilation. Otherwise, the array gets too hot and the performance of the modules decreases. The mounting structure must be fixed to the building or the under-roof beams to ensure durability and safety. | ||
'''Free-standing '''arrays on a ground support, usually consisting of racks, are easy to install and to orient towards the Sun. It might be difficult to avoid shading and therefore, enough space is needed to install the array far from trees, buildings and other objects that might cast shadows on it. The modules are easily accessible which is beneficial for maintenance, but could also imply a higher risk of theft. | '''Free-standing '''arrays on a ground support, usually consisting of racks, are easy to install and to orient towards the Sun. It might be difficult to avoid shading and therefore, enough space is needed to install the array far from trees, buildings and other objects that might cast shadows on it. The modules are easily accessible which is beneficial for maintenance, but could also imply a higher risk of theft. | ||
| Line 24: | Line 49: | ||
'''Building-integrated''' PV arrays consist of thin film modules. This kind of mounting structure is not common in off-grid installations. | '''Building-integrated''' PV arrays consist of thin film modules. This kind of mounting structure is not common in off-grid installations. | ||
| − | + | <br/> | |
= Mounting Structure Materials = | = Mounting Structure Materials = | ||
| − | Mounting structures can be made of: | + | <u>Mounting structures can be made of:</u> |
| − | |||
*galvanised steel, | *galvanised steel, | ||
*painted steel, | *painted steel, | ||
| Line 35: | Line 59: | ||
*wood. | *wood. | ||
| − | There is a vary large offer of factory-made mounting structures available on the market, but it is usually possible to produce them locally, too. It is important | + | There is a vary large offer of factory-made mounting structures available on the market, but it is usually possible to produce them locally, too. It is important that mounting materials are corrosion-resistant and weather proof. |
| + | |||
| + | <br/> | ||
| + | |||
| + | = Further Information = | ||
| + | |||
| + | *For further information on mounting structures for [[Solar Home Systems (SHS)|solar home systems]] see the EnDev wiki page on [[Standards for the Module Support Structure|standards for the module support structure]]. | ||
| + | |||
| + | <br/> | ||
| + | = References = | ||
| − | + | <references /> | |
| + | [[Category:Solar_Home_Systems_(SHS)]] | ||
[[Category:Solar]] | [[Category:Solar]] | ||
Latest revision as of 12:25, 15 August 2014
Overview
When deciding about the optimal mounting location for solar modules the following criteria should be considered:
- To which extent does the place receive high radiation of sunlight?
- is it free of shading?
- is it not exposed to dust and other particles which may cover or damage the modules?
- will the modules be exposed to excessive heat?
- does the place offer protection against theft and vandalism?
- is it close to the battery?
Solar modules can be mounted in a fixed, flexible or tracking way.
Fixed Modules
Fixed modules (either as single module or as array of several modules) are mounted on:
- a pole,
- a roof,
- free-standing on a ground support or
- integrated into a building.
Fixed mounting structures tilt the modules at a fixed angle determined by the latitude of the site, the requirements of the load (appliances which are powered by the PV power system) and the availability of sunlight. The fixed mounts should be stable, flat and well ventilated. They must withstand heavy wind and heavy rainfall.
Flexible System
Flexible system use basically the same mounting structures, but the modules are removable.
Tracking Structures
Tracking structures are more expensive and require higher maintenance efforts. The trackers orient the modules towards the Sun, thus increasing their output.
Mounting (Pole / Roof / Free-standing / Building Integrated)
Modules that are mounted on a pole are easy to install an can be easily oriented towards the Sun. They can be free-standing or installed on the side of a building. Usually, a small array of one or to modules is mounted per pole. Thus, pole mounting is suitable for small solar home systems, especially, if the roof support structure of the house is not stable enough to support a PV array.
For roof mounting the most common support structure consists of racks. It is important to leave a space of at least 10 cm between the roof and the array to allow ventilation. Otherwise, the array gets too hot and the performance of the modules decreases. The mounting structure must be fixed to the building or the under-roof beams to ensure durability and safety.
Free-standing arrays on a ground support, usually consisting of racks, are easy to install and to orient towards the Sun. It might be difficult to avoid shading and therefore, enough space is needed to install the array far from trees, buildings and other objects that might cast shadows on it. The modules are easily accessible which is beneficial for maintenance, but could also imply a higher risk of theft.
Building-integrated PV arrays consist of thin film modules. This kind of mounting structure is not common in off-grid installations.
Mounting Structure Materials
Mounting structures can be made of:
- galvanised steel,
- painted steel,
- aluminium or
- wood.
There is a vary large offer of factory-made mounting structures available on the market, but it is usually possible to produce them locally, too. It is important that mounting materials are corrosion-resistant and weather proof.
Further Information
- For further information on mounting structures for solar home systems see the EnDev wiki page on standards for the module support structure.
