WattGlass Research & Development
Solar ARC is a proprietary nanoparticle coating that virtually eliminates reflection, glare and fogging on glass and other transparent materials. The coating is cost effective and is comprised of well understood and commercially available materials.
Solar ARC surpasses the performance of conventional coatings and is resistant to particulate soiling while remaining non-hazardous and 100% water-based. Typically, these coatings result in tradeoffs between performance and functionality and utilize hazardous materials such as solvents, acids, and fluorocarbons.
Not with WattGlass.
As a part of DOE research, WattGlass has installed solar panels in Florida, Nevada, and New Mexico. Data has been captured over 2 to 3 months comparing WattGlass AR to competitors in the industry, and WattGlass AR performs at an average of 3% increase in power when compared to bare glass.These research testing sites were chosen to be in three separate regional climates to observe any possible effects of the anti-soiling properties of WattGlass AR.
The data to the right shows a comparison of preliminary results of the experiments. As seen on the top three graphs there is an improvement in Cumulative Energy Production of 3.59% compared to bare glass, 1.03% compared to competitor A, and 0.33% compared to competitor B.
As of now it is unknown the exact impact that the Anti-Soiling properties have on these results because there are challenges in decoupling the Anti-Reflective and Anti-Soiling properties from each other. It may be that in some climates WattGlass AR performs better than other, but there is no sign at all of it performing worse in different conditions.
This research is ongoing and will continue for at least 12 months to fulfill DOE grant. There are also more test sites being established to further encourage the use of WattGlass AR.
WattGlass DC Power Measurement
The charts to the left are DC Power output comparison between Tier One modules with WattGlass AR coating and Competitor A's AR coating. These show greater than a 3% increase in peak power output compared to bare glass, and greater than 1% increase in peak power output compared to Competitor A's AR coating.
These measurements were taken on a clear day at the Florida research site in early February 2019 and the results correlate well with flash test data obtained during module manufacturing.
WattGlass DC Power Measurement
The charts to the right are string-level current-voltage curves measured with a Daystar DS-100C mobile curve tracer. Greater than 5.5% increase in lsc compared to bare glass (in-plan irradiance 850 W/m^2), and greater than 2.2% increase in lsc compared to competing AR coating B (in-plane irradiance 920 W/m^2).
Fabricated from an aqueous nanoparticle solution with a proprietary binder, WattGlass ARC is resistant to particulate soiling as a result of it's superhydrophilic surface chemistry that reduces adhesion of dust and dirt. Below are actual images taken with a microscope in a controled experiment between bare glass and WattGlass ARC on soiling performance.