Bifacial solar panels: Innovative, eye-catching, and best of all, more efficient
Bifacial solar panels have grabbed everyone’s attention in the solar PV industry — for all the right reasons.
On and off again: the tariff exemption of bifacial panels
Since a court decision November 2020, bifacial solar panels have officially been subject to under President Trump’s section 201 import duties.
This made bifacial solar panels subject to the 20% duty that other solar panels were subject to at that time.
As of February 2021, the tariff rate on all solar panels moves to 18%.
This follows an extensive back and forth with these tariffs:
- In 2018, bifacial solar panels were initially included when tariffs were imposed on solar panels.
- In 2019, they were granted an exemption by the Trump administration.
- Late that same year, the administration attempted to reinstate the tariff.
- Legal action by the solar industry blocked the reinstatement of the tariffs.
- In November 2020, the U.S. Court of International Trade decided that the administration could reimpose the tariffs on bifacial solar panels.
Let’s back up: what exactly are bifacial solar cells, and how do they work?
Bifacial solar panels have solar cells that absorb light from both the front and the back. That means that besides capturing sunlight from the front of the panel, they also capture all the valuable sunlight that is reflected from the ground, as well as any diffused light that hits the back of the solar cells. Thus, they absorb more sunlight and provide higher efficiency than monofacial solar cells.
A solarium designed with 16 bifacial solar panels for a home in Wilmington, NC. Image source: Florian
This is an advancement over traditional 'monofacial' solar cells that make up the vast majority of existing PV solar systems. Monofacial panels, of course, can only generate electricity from just one side — the side that houses the solar cells and is directed towards the sun.
Here’s a quick video that demonstrates the idea behind bifacial solar panels:
What do the experts say about bifacial solar technology?
Solar industry experts are talking a lot about this highly energy-efficient bifacial solar technology. Here’s what they have to say:
“With market penetration exceeding expectations in 2018, bifacial technology is set to account for one-third of global solar module production by 2022.”
- Edurne Zoco, Research Director at IHS Markit
“Bifacial panels are a no-brainer. They will be the panel of choice for the utility-scale market. It is estimated that the solar farm in York will generate 20 percent more energy due to its combination of bifacial solar panels and trackers that enable each panel to follow the sun, compared with traditional static photovoltaic panels.”
- Toddington Harper, Chief Executive of Gridserve
“Bifacial technology captures more light, and it is not very much more expensive, so it makes sense.”
- Cedric Philibert, International Energy Agency
“Although bifacial technology may cost $0.05/W more to install than a monofacial PV system, a conservative 10% bifacial gain easily outweighs the risk.”
- Scott Stephens, Director of Technology Development at Clearway Energy
Who are the top bifacial solar panel manufacturers?
‘Bifacial’ is definitely the new buzzword in the solar industry. Bifacial panels have become the topic of discussion at solar conferences and trade shows.
Some solar companies are ahead of the curve and have succeeded in achieving high power output from their bifacial product lines.
These are the major players in bifacial solar panel manufacturing:
Korean electronics conglomerate LG is currently dominating the market by offering an energy-efficient bifacial module with a front system of 390 W. Their NeON 2 BiFacial solar panels have an efficiency of up to 18.7%. These panels absorb sunlight from the front and rear sides via a transparent back sheet.
Canadian Solar has combined advanced bifacial cell technology with its double glass module manufacturing expertise to develop the ultramodern BiKu bifacial panels. These modules feature a well-engineered design, an automated manufacturing process, and stringent BOM quality testing. Canadian Solar claims that BiKu bifacial panels produce up to 30% additional power from the back side. These solar systems are highly durable, as they are made with anodized aluminum alloy frames.
Sunpreme’s Maxima GxB 520 modules are made up of HCT cells in a frameless double glass structure. They are known for high power yield with a 20% backside power boost and over 600 W of bifacial output. The thin double-glass construction of Sunpreme’s solar panels provides appealing aesthetics that Sunpreme claims are well-suited for carports, roofs, and canopies. Sunpreme’s bifacial panels are free from light-induced degradation (LID) or potential induced degradation (PID).
JinkoSolar offers Bifacial 72M, a 72-cell module generating 380 W power. It increases systems’ output by 5-25%, depending on various reflective conditions. The unique frameless design of Jinko solar panels greatly reduces the possibility of the PID effect. Also, it is designed for high voltage (up to 1500 VDC) systems. The system also claims only 0.5% yearly power degradation, with 30 years of warranty.
Another one of their panels, the popular Swan module, has combined Cheetah bifacial cells and DuPont Tedlar PVF transparent film, allowing them to achieve an output of up to 400 W on the front side and a 20% energy gain from its rear side.
Other key market players for bifacial solar panels
Here’s a list of many other prominent market players who are involved in manufacturing advanced bifacial solar technology.
- Trina Solar
- AE Solar
- LONGi Solar
- Yingli Solar
- Sunpreme Inc.
- Prism Solar Technologies, Inc.
- JA Solar
Major solar projects using bifacial solar technology
A number of large-scale solar projects built with bifacial solar modules have come online recently, and there are several more in the pipeline. These projects are an indication of how the bifacial solar industry is booming globally. Here are some noteworthy developments:
- In June 2019, Canadian Solar was awarded a Brazilian solar power project to install, which was around 130,000 BiHiKu modules (of 51.1 MWp capacity)
- In Feb 2019, Sunpreme and Tigo Energy completed a 750 kW bifacial system project for a commercial carport in the California Bay Area
- LONGi is working on a 224MW capacity power generation project in Mitchell County, Georgia. It is the largest "bifacial+tracker" power generation project in the United States
The positive attitudes of industry experts and ongoing project announcements show that the sun is shining brightly on bifacial solar panels.
Bifacial panels clearly have a promising future in the utility solar market. But what about when it comes to residential solar? Are they a good fit for homes?
Are bifacial panels a good choice for homes?
Short answer: no.
The biggest reason for this is that bifacial solar panels don’t work well when installed on rooftops. Rooftop solar panels are mounted on frames which leave just a few inches between the panel and the roof surface. This means that very little reflected sunlight reaches the rear panel face, restricting bifacial solar production.
They require a large amount of space in order to avoid shading and to absorb the reflected light properly, making them less suitable for residential properties where real estate is limited.
Finally, bifacial solar panels currently come with a significant cost premium, and in residential setups they are unlikely to produce the additional power required to justify their higher price.
This means that traditional monocrystalline or polycrystalline solar panels are still the most cost-effective option for residential installations.
That being said, bifacial solar systems can still prove useful for certain residential applications. For instance, bifacial thin-film solar cells make sense when used for freestanding structures like pergolas, both providing partial shade and producing energy from both sides.
A solar patio designed from bifacial solar panels to capture sunlight from both sides. Image source: Prism Solar
Bifacial systems may also work for areas where there is no hindrance to the reflection of light. Canopies and awnings made from bifacial photovoltaics PV panels allow the reflected light to reach the back of the panels and generate additional sustainable energy for homes.
The bifacial solar panels market will take off but not all future panels will be double-sided
Bifacial solar panels are being hailed as solar energy's next big thing. With a higher rate of energy production, bifacial panels seem bound to take over the utility solar market in the US.
However, they are unlikely to have much of an impact on the stable residential solar market. A bifacial solar system mounted on the roof of a home can’t really capture the reflecting rays of the sun. Add to that their premium price and frameless design, and it’s clear that bifacial solar technology will not be a fit for most homes.
Before you go, check out these cool applications of bifacial PV technology
We leave you with some stunning and innovative applications of bifacial solar panels from module manufacturer Prism Solar.
Bifacial solar cells installed vertically as a verandah railing
Bifacial solar panels incorporated into an awning
Bifacial solar panels used in a drive-through
Bifacial solar panels used to shade a railway station waiting area
Bifacial solar panels used on a parking canopy