Beginner level, Medium level, Solar panels -

What are bifacial solar modules?

 

Bifacial (“two-faced”) solar panels can capture solar power from both sides of the panel. Bifacial solar panels offer many advantages over traditional solar panels. Power can be produced from both sides of a bifacial module, increasing total energy generation. In general, more power can be generated from bifacial modules for the same area.

 

Traditional solar panels capture sunlight on one light-absorbing side, and light energy that cannot be captured is simply reflected away. This is not the case with bifacial solar panels- rather, these types of panels have solar cells on both sides. This enables the panels to absorb light from the back as well as the front. Practically speaking, this means that a bifacial solar panel can absorb light that is reflected off the ground or another material.

 

Bifacial solar panels can be effective in certain residential applications like pergolas and some ground-mounted systems. Bifacial panels are best used in commercial or utility-scale applications where panels are elevated and angled away from a mounting surface, allowing light to reflect into the back of the panel.

 

The efficiency gain depends greatly on the installation, but bifacial panels on average may see a 6-9% improvement in output over a conventional “monofacial” panel. 

 

Bifacial Solar Panels

 

Free-standing structures like pergolas can benefit from bifacial panels, which will provide partial shade in addition to generating energy. Bifacial panels can also be used in any other case where there is nothing directly behind the solar panels. For example, awnings and canopies made from bifacial solar panels allow for reflected light to reach the back of the panels.

 

Bifacial modules come in many designs. Some are framed while others are frameless. Some are dual-glass, and others use clear back sheets.

 

How are bifacial modules installed?

The way a bifacial module is mounted depends on its type. A framed bifacial module might be easier to install than frameless, just because traditional mounting and racking systems are already adapted to framed models. Most bifacial module manufacturers provide their own clamps to mount their specific brand, taking away any installation hesitations.

For frameless bifacial modules, the module clamps will often feature rubber guards to protect the glass, and special care must be taken to prevent over-tightening bolts and damaging the glass.

 

The higher a bifacial module is tilted, the more power it produces from its bifacial properties. Bifacial modules mounted flush to a rooftop block any reflected light from reaching the backside of the cells. That’s why bifacial modules perform better on flat commercial rooftops and ground-mounted arrays, because there is more room for tilt and bouncing reflected light to the rear of the modules.

 

The mounting system itself can affect the performance of the bifacial modules. Racking systems with support rails usually covered by a monofacial module’s backsheet will shade back rows of bifacial cells. Junction boxes on bifacial panels have become smaller or separated into multiple units positioned along the panel’s edge to prevent shading, too. Mounting and racking systems specially formatted for bifacial installations take out the question of backside shading.

 

Check out SunStore’s Canadian Solar Bifacial panel here.

 

Source: energysage.com

 

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2 comments

  • SunStore

    You are welcome!

  • Quality Solar NT

    Thanks for sharing this information!
    Solar System Installation</a?

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