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Solarpro 3.6, October & November, 2010 October/November 2010 PV Monitoring Granularity | Surge Protection ® Optimal Design, Installation & Performance solarprofessional.com Central Inverter Trends in Power Plant Applications Operations Management Optimize Personnel, Resources & Processes Interview: John Berdner SolarEdge Changing the US PV Industry…Again Array Voltage Considerations Best Practices for Source Circuits 2010 Inverter Specifications SUBSCRIBE Comprehensive Data for FOR FREE Sixty 3-Phase Products BOOTH 1222 SolarCity Intel Folsom Campus ...or anytime at Folsom, CA f solarprofessional.com Actions speak louder than words Visit us at Solar Power International 2010 Booth 4027 The Fronius Difference At Fronius, we’re proud of our products and service, always working to ensure the highest quality standards. To that end, we want to hear from you, our customers. What are we doing right? What can we improve? We strive to return phone calls and emails in a timely fashion. We have created a paper-free, low-stress service Please take a few minutes of your time to help up put your words into action by completing a survey. process supported by knowledgeable technical support. And we stand behind our products with a standard Visit www.fronius-usa.com and click on the link to our survey. Survey participants will be entered to win 10-year warranty, expandable to 15 years. We are always working to provide an excellent customer experience. some great prizes in a monthly drawing, from March through September, and a grand prize drawing to be held Simply put, we do what we say we will and call that “The Fronius Difference.” at Solar Power International 2010 in October. Sign up for our monthly newsletter for more information on prizes and other news from Fronius. Want more information on Fronius products? Visit www.fronius-usa.com, or call 810-220-4414. PV Inverters . System Monitoring . Accessories Actions speak louder than words Visit us at Solar Power International 2010 Booth 4027 The Fronius Difference At Fronius, we’re proud of our products and service, always working to ensure the highest quality standards. To that end, we want to hear from you, our customers. What are we doing right? What can we improve? We strive to return phone calls and emails in a timely fashion. We have created a paper-free, low-stress service Please take a few minutes of your time to help up put your words into action by completing a survey. process supported by knowledgeable technical support. And we stand behind our products with a standard Visit www.fronius-usa.com and click on the link to our survey. Survey participants will be entered to win 10-year warranty, expandable to 15 years. We are always working to provide an excellent customer experience. some great prizes in a monthly drawing, from March through September, and a grand prize drawing to be held Simply put, we do what we say we will and call that “The Fronius Difference.” at Solar Power International 2010 in October. Sign up for our monthly newsletter for more information on prizes and other news from Fronius. Want more information on Fronius products? Visit www.fronius-usa.com, or call 810-220-4414. PV Inverters . System Monitoring . Accessories Distributed by: C173_REC_Solar_skies_AEE_ad_206x276.indd 1 04.08.10 13.02 Buy from the Best PEAK ENERGY MODULE When you buy from AEE Solar, you can be confi dent you are getting the best products the industry has to off er. With 30 years of solar experience, we know which products deliver the best value for your money. And when you add in the broadest product selection in the business, Get REC’s New High-Effi ciency unsurpassed dealer training and tech Peak Energy Module from support, and our renowned Renewable AEE Solar! Energy Design Guide & Catalog – available only to AEE Solar dealers – you can see why AEE Solar is the only wholesale distributor you’ll ever need. MORE POWER PER US-PRODUCED Become an authorized dealer and get SQUARE FOOT SILICON all AEE Solar has to off er. ROBUST AND ENERGY PAYBACK DURABLE DESIGN TIME OF ONE YEAR 800-777-6609 www.aeesolar.com [email protected] THE ONLY WHOLESALE DISTRIBUTOR YOU’LL EVER NEED Contents October/November 2010 Issue 3.6 Features 38 38 Central Inverter Trends in Power Plant Applications Distributed PV generation is on the rise, but manufac- turers of large central inverters are eyeing an even big- ger prize: power plants. Inverter selection and system design considerations for large projects and power plant applications are examined. BY GREG BALL 82 Operations Management for Solar Integrators More than merely overseeing activities that result in an end product, operations management con- tinually analyzes every step of the process, look- ing for ways to improve efficiency and effective- ness. Basic principles for optimizing personnel, resources and processes are all considered. BY DARLENE MCCALMONT 82 46 2010 Central Inverter Product Specifications 180 This SolarPro table offers comprehen- Min. inverter MPPT voltage = 305 Vdc sive product specifications for nearly 60 central inverters, many with multiple 140 S t interconnection voltage options, available 289.8 Vmp a A A n S S d H from 11 manufacturers. H a 100 r R R d A A t E E e s l 2 t o % w 68 Array Voltage Amperage 60 c o t t n e e d Considerations m m i t p i p o . Reduce up-front system cost and optimize 20 n s 499.8 Voc long-term performance by avoiding the 0 pitfalls of string sizing on autopilot. 0 100 200 300 400 500 600 Informed by years of experience, the author Voltage details array design best practices for determining the minimum and maximum number of modules per source circuit. 68 BY BILL BROOKS, PE 6 SOLARPRO | October/November 2010 NEED TRAINING? DC POWER SYSTEMS trains more installers than any other solar distributor nationwide. DC Power Systems is a full service distributor of renewable energy solutions. Working with our national network of qualified dealers and installers, we design and supply solar electric and wind power systems for business, residential and government applications. We offer training programs for renewable energy dealers and contractors with support from our manufacturing partners. The training sessions include seminars at supplier facilities, at our headquarters in Northern California, and at various locations across the country. VISIT US AT SOLAR POWER IN LOS ANGELES- BOOTH # 3945! WWW.DCPOWER-SYSTEMS.COM/TRAINING - 800-967-6917 - [email protected] HomePower & Solar Pro Ad 2010 SPI.indd 1 8/4/10 12:59 PM Contents2 October/November 2010 Issue 3.6 Departments FRONT END 10 Contributors Experience + Expertise 108 16 QA Quality Assurance Adding Granularity to PV Monitoring Surge Protection Devices for PV Installations 30 The Wire Industry Currents 7.6 6.3 5.1 3.8 Amps 2.5 16 1.3 98 0 BACK END 3:00 7:00 7:00 3:00 7:00 7:00 3:00 7:00 7:00 11:00 11:00 11:00 11:00 11:00 11:00 Jul 24 Jul 25 Jul 26 Time 98 Interview An Experienced Perspective John Berdner, SolarEdge Technologies 30 104 Training Continuing Education for the Pro 108 Projects System Profiles National Freight Industries Solar HQ, Cherry Hill, NJ Alta Torre Senior Housing, Palo Alto, CA 111 Advertiser Index f ON THE COVER SolarCity’s commercial project manager, Jonathan Gornik, coordinated this 1.1 MW STC PV power plant at Intel’s Folsom Campus in Folsom, California. Power generated by the First Solar thin-film array is exported to the utility grid at 12.47 kV using a custom integrated Satcon Prism 1 MW Medium Voltage Package, which includes two PowerGate Plus 500 kW inverters, one 1,000 kVA oil-filled transformer and medium-voltage switchgear. Photo Courtesy of Satcon Technology 8 SOLARPRO | October/November 2010 TS_US_Home Power & SolarPro-206-276.pdf 1 2010-7-29 16:14:43 Solar Power InternationalVisit us at Booth 3211 C M Y CM MY CY CMY K Solar has never been more popular As the world’s most prestigious sport, F1 embodies the pursuit of excellence through technological expertise and innovation. At Trina Solar, it’s because of this shared passion for innovation that we’ve teamed up with the Renault F1 Team, one of Formula One’s most advanced teams. As solar accelerates on the track to grid parity, we think it’s time to bring solar to an even larger audience – the world. For more information, visit us at www.trinasolar.com Ocial Sponsor of Contributors Experience + Expertise Greg Ball is a senior electrical engineer at BEW Engineering in San Ramon, California. He has more than 20 years of experience working for solar system integrators and engineering firms. He is responsible for the electrical design of more than 120 MW of PV installations in the US, Europe and Asia. He serves as co-convener for the IEC’s PV Balance of System Working Group and is active in US codes and standards development. Bill Brooks is a registered professional engineer in both North Carolina and California. A consultant to the PV industry on a variety of topics—including performance, troubleshooting and training—since 1992 he has focused on the analysis and testing of PV systems for utility-interconnected applications. He has written widely used technical manuals for the PV industry. His experience includes work on the technical review committees for the NEC and the Institute of Electrical and Electronic Engineers (IEEE) for utility interconnection standards. Cosmos Corbin is a co-founder of DECK Monitoring, a renewable energy monitoring company based in Eugene, Oregon. He leads the product development team, designing new features and refining existing solutions.
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