Uni-Solar Laminate Rolls

Re: Uni-Solar Laminate Rolls

a company is selling 13.7%-efficient crystalline Suntech modules for $1.70 per Watt:


while their pricing for the 6.3%-efficient Unisolar laminates is $1.20 per Watt ($1 per Watt, if you buy the inverter as well):


Whether Unisolar's module is price competitive with the crystalline module depends on the balance-of-system (BOS) costs, the long-term performance degradation, and the system mounting (tilt vs no tilt). BOS costs are typically lower for modules with higher efficiency - the "advantage" is about 7-8c per Watt for each efficiency point, for large ground systems, and maybe a bit more for large rooftop systems. Using this common shortcut, Unisolar's module needs to be priced at $1.20 per Watt, all else equal (i.e, ignoring long-term performance degradation), which is what that company has done. While this shortcut does not apply to you (you will be doing the installation yourself from what I understand), you correctly note that Unisolar's laminates may have a shorter life and may underperform, so probably the $1.20 per Watt price is fair anyway.

Note though that Unisolar's cost of manufacturing was $2.95 per Watt in the March quarter - in other words, the company effectively lost money on each and every modules it sold. The company claims that prices for its modules at the factory gate are $2.00-$2.10 per Watt on average, but it is liquidating some nonstandard inventory this quarter (the modules that company is selling have 20 cells instead of 22 cells - that's all that's nonstandard, apparently). Regardless, the company's survival is questionable, so don't expect that your warranty will be honored if a problem develops in year 2014 and beyond.

mike90045: The only reason that the Unisolar modules can SOMETIME survive a hole being punched in them is because of the built-in bypass diodes, and many crystalline modules have bypass diodes these days as well. Unisolar's modules' long-term performance is questionable (the company really started shipping the current "triple junction" products in 1998, and there aren't many such Unisolar systems that have survived 10 years, while there are plenty of crystalline systems that have survived 20+ years). Some results by NREL indicate that the modules might be violating their long-term performance warranty (and there are documented cases of real-world system underperformance). Also, note that the Unisolar modules ignited on the rooftop of the Long Beach Convention Center in LA in February of 2008 (admittedly, there have been a few other fires linked to PV installations, with other modules such as BP's, Sunpower's, Open Energy's, etc). Finally, there have been documented failures of the adhesives used by Unisolar (take a look here: http://picasaweb.google.com/fan.of.ecd/FloridaInternationalUniversitySolarInDistress )

modified only due to some educational benefit as the whole post would've been deleted otherwise. this serves as a warning to the poster as well that this forum is a business sponsored forum. niel

Re: Uni-Solar Laminate Rolls

dmiller: Walking on the Unisolar laminates is a sure way to invalidate the warranty, or worse, rip apart the internal wiring and damage those numerous bypass diodes, and yet, some clueless installers who don't know how to read the warranty are still doing it (and take pictures of themselves).

There are several products on the market that are essentially crystalline PV cells glued to a membrane and covered with Tefzel or similar transparent layer, which then you could glue to a mobile roof (if that's what you want) - Toyota's Prius solar roof is made of crystalline cells, for example. One of the advantages of crystalline cells is their efficiency - they require 1/3 to 1/2 the area that Unisolar cells need to generate the same amount of electricity.

And, unlike crystalline modules, Unisolar laminates don't need to be ripped apart to start underperforming - NREL has documented severe long-term degradation (not the initial light-induced one) that appears to violate the warranty, but Unisolar is hiding the final results of the study.