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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Page 42 of 47

SOLARBUILDERMAG.COM | 43 Utility-scale sites often come with reactive power requirements, which usually means reducing the real power produced to provide reactive power support. Because of this, be sure to check the power factor or Max AC Output Power of inverters you spec because when you reduce active power, you're not getting paid at what the system was designed to produce. CPS invert- ers, for example, come with kVA overhead and will supply 100 percent active power while accommodating reactive power requirements. "If we had a 100 kW/111 kVA or our 125-kW/132- kVA rated inverter and the utility company said we need to run at .95 power factor (PF) we could do this without sacrificing real power (kW )," says Sarah Ozga, product manager at CPS America. "For example, if we have enough PV power coming in from the array to produce at max capability on the 125-kW/132-kVA inverter we would be producing 125 kW active power and the apparent power would be 132 kVA." Attaching solar photovoltaic (PV ) panels to roofs with high-per- formance adhesives can not only substantially reduce the cost and complexity of installing solar it can keep buildings cooler and reduce air conditioning expenses in the summer as well says new research from the Fraunhofer USA Center for Sustainable Energy Systems CSE, an applied research and development laboratory dedicated to solar photovoltaics, smart energy-efficient buildings and grid tech- nologies. The new research was presented by Dr. Nitin Shukla at the TechConnect World Innovation Conference and Expo, held in Washington from May 14 to 17. "As we've worked to refine the concept of adhesive-mounted solar, one concern we've regularly heard is that, without a rack separating them from the underlying roof to keep air flowing, they might drive unacceptable increases in roof-shingle temperature that can damage and degrade roofs," Dr. Shukla explains. "Our research has demon- strated that not only is this not happening, adhesive-mounted solar can serve to cool roofs and decrease power demand for air condition- ing by absorbing — and turning into electricity — sunlight that would otherwise raise the temperature of roof shingles." Subtract one pound of steel per foot length from every pile used to support a solar photovoltaic panel, and you may save millions of pounds — and a lot of money. The idea, which involves changing the way photovoltaic ground mount piles are designed, came from a partnership between HDR struc- tural engineer Steve Gartner and PACO Steel, and has earned recognition in the American Society for Civil Engineering Innovation Contest, taking home the Feasibility Award in the Innovative Business Model category. The new design process involves using a fully automated electric resistance forge- welded process that lets engineers design custom-made piles with very little excess steel. Previously, the steel piles used for the ground mounts were designed by choosing from six stan- dard hot-rolled sections in the American Institute of Steel Construction manual. Now, there are more than 2,000 options to choose from that meet project load demands and result in very little excess steel. The process is flexible enough to accommodate both PV tracker and PV fixed-tilt systems. COOL Adhesives Finding LESS STEEL For Real Factoring in POWER FACTOR

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