Solar Builder

JUL-AUG 2018

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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36 J U LY / AU G U S T 2 0 1 8 Arctech Three tracker styles to match every solar site A rctech offers three tracker designs: The Arctracker Pro is its centralized tracker with push-pull design that is the best for f lat land. The SkySmart is a single-row design with two modules in portrait that has fewer posts and is perfect for bifacial modules, and the SkyLine is a single- row design with one module in portrait. Arctech makes the majority of its products with the support of two enormous factories, with a third on the way in 2019, to bet- ter control costs and quality. Key hardware All of Arctech's trackers have its new D-shaped torque tube that adds stability and saves material. Single-row trackers are powered from the string rather than from the batteries. A beefy bearing was recently added that can handle a 20 percent N-S slope and stop the translation of weight. Software "Most of what we are doing is ensuring interfaces to client's SCADA systems," says Guy Rong, president of Arctech Solar. "We have a number of alarms in the rare case something happens to the system. Beyond this we are building software to create more accu- racy on a row-by-row basis. We will announce when this is available." Case study A 172-MW project in Telangana, India, had three main chal- lenges that were solved by the design of the Arctracker Pro. Challenge 1: Rough terrain and uneven slope. Solution: Arctech took advantage of special linkage and different post lengths to offset land contour variations and, at the same time, keep the high density of PV modules in available land and main- tain high energy yield. Moreover, tracker sizes were specially designed to make best use of corner areas of land. Challenge 2: High wind. Solution: Arctech Solar reinforced the tracking system by adding 25 percent more dampers to ensure stability and reliability of general operation and avoid damages caused by strong wind. Challenge 3: Installation within timeline. Solutions: Installing 172 MW at a single site within the timeline was a challenging task for the EPC. In India, it's not always easy to f ind skilled man power in remote areas. To solve these issues, the Arctech engineering team collaborated with the EPC to f inalize installa- tion phases well before shipping. Posts were shipped f irst to make sure the civil work started early while Arctech's project managers gave tutorials on demo tracker installation so that all teams could start work simultaneously. TRACKING TRACKERS

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