Sturdiness of Anti-Reflective Coatings of Photo voltaic Glass


Rayzon Photo voltaic has lately carried out a complete evaluation to guage the sturdiness of their anti-reflective coatings. The outcomes of this research showcase the corporate’s dedication to making sure long-lasting and environment friendly photo voltaic panel efficiency. These findings reinforce Rayzon Photo voltaic’s place as an trade chief devoted to advancing the sustainability and reliability of photo voltaic vitality options.

February 22, 2024. By Information Bureau

Rayzon Photo voltaic employs superior applied sciences to reinforce the effectivity of photo voltaic panels. Anti-reflective coatings (ARCs) are utilized to the glass floor of photo voltaic panels to cut back reflection losses and improve energy technology. The effectiveness of those coatings is set by the refractive index (RI), ideally falling inside the vary of 1.23 – 1.27. Rayzon Photo voltaic makes use of cost-effective nano-porous silica-based coatings crammed with air to attain optimum transmittance, boosting glass effectivity by as much as 2 %.

Determine 1: Schematic diagram of the ARC coated glass

Sturdiness of the Coating
The SiO2 based mostly ARC coating on the photo voltaic glass is just round 100 nm thick (which is 1/500 occasions the thickness of human hair) and might get broken if not fastidiously maintained. The assorted components that may trigger degradation of the ARC coating are mentioned under.


– Abrasion throughout module cleansing

The porous ARC coating is vulnerable to abrasion harm from module cleansing if onerous brush is used. The thinning of the ARC coating layer attributable to abrasion will result in a change within the reflectance sample (minima shifting to shorter wavelengths). Additionally, the reflectance will increase because the coating is faraway from the glass floor. So, such abrasion can even result in discoloration of the ARC coating.

Determine 2: Abrasion harm to ARC Coating on glass (after 6 years in area)


– Water stagnation on glass

The pores in silica-based ARC coatings are likely to readily adsorb water from the ambiance (extra so if water is allowed to face on the glass), and in addition react with the natural compounds or carbonates dissolved in water. Such contamination might improve of the efficient refractive index of the coating resulting in lowered anti-reflection impact (larger reflection of sunshine). This may occasionally additionally result in the rainbow-type discoloration noticed on the backside on the photo voltaic panels (the place water normally stagnates in panels put in at low tilt angles). The adsorbed water might be faraway from the ARC coating at excessive temperatures within the vary 55 – 135 °C. So, the discoloration might disappear in the summertime season when module temperature exceeds 55 °C for lengthy intervals.


 Determine 3: Rainbow-type discoloration in ARC coating of photo voltaic glass


– Response with natural supplies   

Some ARC coatings present short-term stains upon area publicity in residential and heavy pollen areas (relying on the porosity and the dimensions of the pores within the ARC coating). The trapping/response of the natural supplies (like plant seeds or pollens) within the ARC coating pores results in small silvery or brown spots, which disappears inside 1-2 months of publicity to sunshine. The loss in energy technology is marginal (<1%) attributable to such discoloration, because the affected space may be very small in comparison with module space.

Preventive Measures
The lifetime of the Silica based mostly ARC coating (normally 5 – 7 years) might be maximised if correct measures are adopted to stop its premature degradation, as mentioned under.

– Use water drainage clips

Water shouldn’t be allowed to gather on prime of the photo voltaic panels for lengthy period. For modules with excessive tilt angle (higher than 20°), the water will naturally drain from the photo voltaic panels. For modules put in at decrease tilt angles, water is not going to fully drain out and might stagnate on the backside fringe of the photo voltaic panels which might then result in discoloration of ARC coating. To keep away from such discoloration attributable to stagnating water, it’s endorsed to make use of water drainage clips as proven in determine.

Determine 4: Water drainage clips for photo voltaic panels

– Use gentle brush or squeegee for cleansing panels

Brush with gentle bristles or squeegee (having rubber blade) are advisable for cleansing of the photo voltaic panels.

– Use solely contemporary water for module cleansing

Use contemporary water with whole hardness < 75 mg/liter for cleansing the modules to attenuate the response of ARC coating with the dissolved carbonates.
Rayzon Photo voltaic emphasizes the essential position of ARC coatings in enhancing energy technology from photo voltaic panels. The skinny nature of the coating requires cautious dealing with. Suggestions embrace avoiding water stagnation, utilizing gentle cleansing instruments, and using contemporary water for cleansing. The sturdiness of Rayzon Photo voltaic’s ARC coating finally lies within the fingers of end-users, and their lively involvement can considerably contribute to its longevity.

– Rayzon Photo voltaic Pvt. Ltd.


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