Semi-flexible solar panels, which are widely used in the RV, Marine,Camping, Aerospace industry, have two very strict constraints on space or allowable loading. The choice of material to coat the photovoltaic cell is perhaps the most important aspect of characterizing the mechanical properties of the panel.
It is well known that PET has a low thermal resistance in the short term and is therefore not recommended for use in very hot environments. In addition, PET cannot withstand chemical attack caused by various acids and basic compounds dissolved in water. After a long time, this will cause the plastic layer to turn yellow and then delaminate or rupture.
PET Panel Delamination
The advantage of this type of product lies in the flexibility of the panel. It is lightweight and small in size (for panels and junction boxes). The most important thing is to save on the economy because of the use of plastic polymers.
In applications such as marine applications, we will find that some features are certainly beneficial, but not enough to ensure high durability.
At sea, exposure to deteriorating material conditions is inevitable. In some cases, physical stress caused by very harsh sea conditions can cause damage to photovoltaic cells if not adequately protected.
Characteristics of ETFT Materials
ETFE is a fluoropolymer or a polymer containing a fluorine atom. The molecules that make up the polymer are chemically very stable. ETFT can withstand high levels of thermal stress and chemical attack, far beyond what PET can do. Another essential feature of ETFE is that it is an excellent polymer for this application. Its total UV permeability: a large number of tests on outdated samples show a permeability of 95 % with a direct light percentage of 88% and an irradiance ranging from 400 to 600 nm of the visible light spectrum.
Advantages of ETFT Materials
ETFE is not only a durable and “ultraviolet-friendly” material but also “smart.” Due to its molecular chemistry, ETFE is a self-cleaning material. Another sign of ETFE Intelligence is the environmental sustainability of the polymer. In fact, it is 100% recyclable. Even its production process respects the environment because it does not require the use of chemical solvents or petroleum products. It strictly respects the “Montreal Treaty” and therefore it is not part of the material group that destroys the ozone layer of the atmosphere.
Unlike polymers such as PET or TPT, ETFE is also recommended for particularly hot and dry environments and climates because of its low flame retardancy with high flame retardancy.
In addition to the structural differences mentioned above, we have seen that both types of panels have advantages and disadvantages both economically and practically. The buyer needs to evaluate the selection based on the needs. Here recommend this kind of ETFE semi-flexible solar panels, good quality and high efficiency.
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