Solar Builder

JAN-FEB 2019

Solar Builder focuses on the installation/construction of solar PV systems. We cover the latest PV technology (modules, mounting, inverters, storage, BOS) and equip installers/contractors with tips and tools to make informed purchasing decisions.

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SOLARBUILDERMAG.COM | 43 Trina Solar Trina Solar's DuoMax Twin is its half-cut, bifacial mono PERC offering. It uses heat strengthened glass in lieu of the polymer backsheet used in other modules. The dual-glass construction provides better protection for the cells and improves the long-term reliability and durability of the module. Also, the Duomax Twin's junction box avoids shading on the backside of the panel. Trina has extended the power warranty to 30 years. Warranty: 10-year product and workmanship, 30-year linear. Rated power 395 W Cell type monocrystalline / half-cut / PERC / bifacial Module efficiency 19.9% Short-Circuit Current 10.29 A Open Circuit Voltage 49.8 V Rated Current 9.68 A Rated Voltage 1,500 V Temperature coefficient -0.39% Quantity per pallet 33 The buzziest of buzzy PV module tech- nology right now is some combination of mono PERC and half-cut cells with the innovative application of bifacial module design. "Recent projects incorporating this com- bination dropped levelized cost of electricity so rapidly that the biggest barrier to grid parity for utility-scale photovoltaic plants is not the cost of technology but rather the soft costs related to grid integration, land, labor and legal fees," LONGi Solar tells us, which has broken world records for PERC cell and module technology eight times since September 2017. "Better, more effi- cient products on the market will free up resources for other types of innovation in the solar industry." DNV GL, the world's largest resource of independent energy experts and certi- fication body, was just selected to receive a $200,000 award from the U.S. Department of Energy (DoE) Solar Energy Technologies Office (SETO) to research bifacial PV technology. "The aim of the study is to accelerate commercial deployment of bifacial PV modules at scale," says Tara Doyle, head of business development for DNV GL's PV module testing lab [now PVEL]. "If proven viable through extensive perfor- mance and reliability testing, bifacial PV modules have the potential to become the preferred technology for ground- mounted PV installations around the world." The project will entail the collection of field data over the course of one year at DNV GL's outdoor solar test facility in Davis, Calif. It will include bifacial and monofacial 1500V PV modules provided by LONGi Solar, Astronergy Solar, Hanwha Q CELLS and Trina Solar, tested on single-axis trackers provided by solar tracking company NEXTracker, and two albedo ground types. Data acquisi- tion will be highly granular, using active- ly calibrated equipment. The collected measurements will be used to generate PAN files and subsequent energy simula- tions using PVsyst. Bifacial boost 2

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