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Nrel model improves predictions of shade effects on solar pv - Auto Diagnostic Interface Manufactur by na b





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Nrel model improves predictions of shade effects on solar pv - Auto Diagnostic Interface Manufactur by
Article Posted: 04/16/2013
Article Views: 43
Articles Written: 2638
Word Count: 399
Article Votes: 0
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Nrel model improves predictions of shade effects on solar pv - Auto Diagnostic Interface Manufactur


 
Business,Business News,Business Opportunities
Using microinverters instead of typical string inverters canimprove solar panels' performance in shade by more than 12percent, according to a new National Renewable Energy Laboratorytest procedure, which the lab says greatly improves the accuracy ofpredictions about shade effects. Shade hinders photovoltaic performance, which is why solarinstallers consider it in PV system design. The effects of shadecan vary depending on the configuration of the PV modules, theextent of the shade and the use of shade-mitigating powerelectronics in the system. However, the industry currently lacksrepresentative, repeatable test procedures for evaluating theannual effect of shade on different PV systems equipped withdifferent shade mitigation devices.

NREL s report, Photovoltaic (PV) Shading Testbed for Module-level PowerElectronics, details a repeatable test procedure for simulating shadedoperation of a PV system and an analysis model for converting thesemeasurements into annual performance forecasts. NREL measured shade from more than 60 residential installations,which were analyzed for three typical shade scenarios: light,moderate and heavy shading. Engineers compared the relativeperformance of a system using shade mitigation devices against anidentical system equipped with a reference string inverter forthese three shade scenarios, providing an annual performanceimprovement score. PV Evolution Labs conducted an initial application of the testprotocol, which showed the shaded performance benefit ofmicroinverters compared with a typical string inverter on identical8-kW solar arrays. According to the test, the microinverterincreased system production by 3.7 percent under light shading, 7.8percent under moderate shading, and 12.3 percent under heavyshading, relative to the reference string inverter case.

The annual shade improvement score can help performance modelingsoftware such as PV Watts and System Advisor Model better predict annual performance for PV systems that use shademitigating power electronics, NREL says. It also allows an accuratecomparison between different devices. Also this week, Clean Power Research launched the latest version ofits SolarAnywhere solar prediction tool, Greentech Media reports . The tool predicts rooftop installations minute-by-minute poweroutput using a combination of satellite imagery, solar installationdata and patented methods to predict how the systems will act whenhard data isn t available, Jeff Ressler, the company s presidentof software services, said.

In April, the EPA launched a tool to test vacant and contaminatedland for solar and wind energy potential .

We are high quality suppliers, our products such as Auto Diagnostic Interface Manufacturer , Heavy Duty Truck Diagnostic Tools Manufacturer for oversee buyer. To know more, please visits Elm Obd Interface.

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