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Contractors World

 
Contractors World - INTERNATIONAL
The free digital publication for
construction, demolition, mining and quarrying industries.

Contractors World International- 2017 Vol 8 No 2

 


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innovations

 

Solar Energy Solution Creates Endless Opportunities?

Semi-Flexible Solar PanelsOver the past decade, solar energy panels have gone through several radical advances as new technology has enables more efficient, extremely durable and lower cost solar panels

Semi-Flexible Solar Panels

The term ‘semi-flexible’ solar panel is an oxymoron. It suggests the solar panel to be partly flexible. The oxymoron derives from what is inside the solar panel, a rigid crystalline Silicon solar cell.

So then what happens when you bend a semi-flexible solar panel built with solar cells which theoretically are not flexible?
Mechanical stress such as bending or walking will cause the crystalline cell to develop hair line or micro cracks. With continued handling and bending, micro cracks accumulate in the cell and these cracks will not ‘go away’ or ‘heal’ in some miraculous way.

The cells increasingly loose output over time. Manufacturers indicate an ability to bend a maximum 30 degrees. The example below left is clearly beyond 30 degrees causing excessive stress in the cells.

Here is why: 99% of all semi-flexible solar panels are built with standard crystalline Silicon cells with fingers and bus bars:

The fingers ‘capture’ the electrons and channelling them to the busbars from where they eventually will be leaving the solar panel through the junction box.

Micro cracks in the cell break the fingers and interrupt the flow of electrons, preventing them reaching the bus bars, thus the solar panel loses output.

The Flexopower Tacoma 145 is built with a 2 dimensional grid cell without bus bars, making the entire solar panel resilient to micro cracks. A Different Structure

The Flexopower Tacoma 145 is built with a 2 dimensional grid cell without bus bars, making the entire solar panel resilient to micro cracks.

The 2D cell grid (top) captures electrons and circumventing micro cracks. Electrons flow without loss to the junction box. The solar panel does not loose output.

In summary, semi-flexible solar panels are built with crystalline solar cells, which develop micro cracks during bending and mechanical stress.

Flexopower

 


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