Flexible solar modules are a niche product. Often seen on a smaller scale attached to RVs, on backpacks and near tents, these nontraditional solar panels are touted for their off-grid portability. After all, who would lug a 50-lb glassed solar panel to a favorite camping spot?
Sunflare flexible thin-film module
But flexible panels are proving they’re not just for mobile applications. More powerful flexible modules are finding their way into sleek systems on roofs that can’t support the full weight of glassed modules. They’ll likely always be considered an off-grid product, but flexible modules are getting more flexible with their applications.
Sunflare manufactures flexible panels for the residential, commercial, recreational and transportation industries. The company uses CIGS thin-film encapsulated in polymer sheets for a 75% lighter solar panel when compared to glassed silicon. Sunflare’s solar panels are installed with adhesives, which allow for more moldability and lighter rooftop systems.
“For roofs, that means there are no penetrations and significantly less weight from installation mounting hardware,” said Elizabeth Sanderson, Sunflare’s chief marketing officer. “These features are perfect for roofs on expansive warehouses and distribution centers that have less structural reinforcement.”
Sunflare’s top product, Flex60, is the same size as a traditional 60-cell crystalline silicon module but doesn’t have a frame, only weighs 11 lbs and produces up to 185 W. The soon-to-be-released PowerFit 20 module fits between the seams of a standing-seam metal roof. The company also makes other panel sizes for “adventurers and overlanders” looking for more flexible designs.
Sunflare flexible thin-film modules used on a rooftop
Flexible modules aren’t limitless in their bendability; their name usually just means they aren’t hindered by the rigid constraints of glass. In fact, whether the flexible panel uses silicon or thin-film cells encapsulated in polymers, it likely shouldn’t be bent completely in half, but it’s still much more malleable than a glassed module.
“With Sunflare, the bend radius is roughly 10 in. (a 30° bend), which is equivalent to bending the panel around a basketball without causing damage,” Sanderson said. “While it is possible to physically fold the panel, that would create a permanent crease in the substrate and possibly damage the electrical connections.”
Although silicon is known for its brittle qualities, it too can be used in flexible modules with special designs. U.S. company Merlin Solar uses a grid of interconnects instead of traditional busbars to provide more stability to solar cells, allowing the crystalline silicon solar panels to be flexible when encased in polymers. Other flexible silicon panel makers include Lumeta and its Lynx modules for residential and commercial applications, and startup mPower with its DragonSCALES mesh-like silicon panels.
mPower’s modules have so far only been tested on satellites in outer space, and Merlin’s durable modules have lent themselves more to the transportation and military markets, but flexible silicon modules are finding homes on residential and commercial rooftops. Lumeta caters its production to rooftops and Merlin has completed a few commercial projects.
Merlin Solar flexible silicon solar panels. Courtesy of Twitter
Crystalline silicon is a better performer than thin-film in almost all situations, especially in small-scale projects. Silicon solar cells are more powerful and more efficient in real-world conditions than thin-film, and the silicon supply chain is much more consistent. But thin-film will always be the best choice for flexible modules for flexibility’s sake. No matter the design, silicon cells do still need more structural support than thin-film.
When the goal is to have solar power of any kind on unique surfaces rather than hitting a certain power output, flexible solar panels can meet the challenge.
“Our mission is to reduce CO2 for a healthier future. This requires more solar adoption throughout the world,” Sanderson said. “In order to have more solar used, we need to have different kinds of solar, like flexible CIGS, that has different benefits and can go in new places.”
For more than a decade, ArteZanos Inc has utilized flexible CIGS and recently this new flexible c-Si as the solar pv option for the ArteZanos Hybrid Roof System. The system is Miami Dade NOA approved for the Hurricane High Velocity Wind Zone and also has BIST for solar thermal as well as the integration of vegetation within the same roofing envelope. Traditional framed modules on racks with penetrations to the roof is not the best way to treat your roof or leverage the 26% Solar Tax Credit. Because the ArteZanos Hybrid System integrates both PV and less expensive BIST technologies, you may qualify for 26% of the whole roofing expense without a cap limitation because its a solar roof integrated system. In Florida, the Construction Industry Lic Board affirmed a Dec Statement 2011-60 that its within the scope of roofers and Division One contractors to install these type panels. This participation lowers balance of system costs.
Very informative and interesting article.
I shall further examine the use of roof and float solar panels on dams.
Thank you again for the very informative article and introduction.
Best wishes,
Is there any value to end-of-life for these flex panels? Can they be reignited for additional years at
a lower power output?
Reignited? While all solar panels are likely warrantied for 20+ years, they can all be used for much longer at lower power output.
Very good information on what has also been called ROSA, or Roll Out Solar Array. I believe some company did this recently at the ISS (mPower?) for panel replacements to see how it works out in space. It seems like there is a nexus, where the consumers and the manufacturers are willing to change over to BEVs as the status quo vehicle drivetrain. One has reason for pause, when using a work truck or SUV off road and the increased energy requirements to forge a path in wildlands. It would be easy to get into the wilds and run low on charge. With a ROSA, one could roll out the array at camp and over a few days help recharge the BEV battery.
Early pioneers of CIGS like Nanosolar even had a manufacturing plant in Germany failed to make product at a price point less than China could make more efficient mono-crystalline solar PV panels. Perhaps, these companies will have better outcomes, at least in niche markets.